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Stock-Based Compensation - Share-based Compensation, Activity (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum payout range	0.00%
Maximum payout range	200.00%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 1D
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
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Reference 24: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Retirement Plans and Postretirement Benefit Plans - Schedule of Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plan [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assumptions Used Calculating Benefit Obligation, Discount Rate	5.40%	5.45%	2.75%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	4.20%	4.20%	4.20%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate	3.50%	3.50%	3.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.45%	4.01%	2.63%
Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.00%	7.00%	7.00%
Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	4.20%	4.20%	4.20%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate	3.50%	3.50%	3.50%
Postretirement Benefit Plans [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assumptions Used Calculating Benefit Obligation, Discount Rate	5.35%	5.40%	2.80%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.40%	2.80%	2.45%
Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	4.00%	4.00%	4.00%

Summary of Significant Accounting Policies Property - Summary of Property Plant and Equipment (Details) - USD ($)
$ in Millions

Dec. 31, 2023

Dec. 31, 2022

Public Utility, Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

$ 16,110.4

$ 15,131.3

Accumulated Depreciation

4,809.4

4,584.5

Net property, plant and equipment

11,301.0

10,546.8

OG&E [Member]

Public Utility, Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

16,104.3

15,125.2

Accumulated Depreciation

4,809.4

4,584.5

Net property, plant and equipment

11,294.9

10,540.7

OG&E [Member] | Electric Generation Equipment [Member]

Public Utility, Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

5,295.9

^[1]

5,188.1

^[2]

Accumulated Depreciation

2,081.0

^[1]

1,982.7

^[2]

Net property, plant and equipment

3,214.9

^[1]

3,205.4

^[2]

OG&E [Member] | Electric Transmission [Member]

Public Utility, Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

3,306.7

^[3]

3,180.5

^[4]

Accumulated Depreciation

707.6

^[3]

667.9

^[4]

Net property, plant and equipment

2,599.1

^[3]

2,512.6

^[4]

OG&E [Member] | Finite-Lived Intangible Assets, Major Class Name [Member]

Public Utility, Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

568.5

384.0

Accumulated Depreciation

219.8

193.6

Net property, plant and equipment

348.7

190.4

OG&E [Member] | Property, Plant and Equipment, Other Types [Member]

Public Utility, Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

643.1

591.3

Accumulated Depreciation

236.7

213.2

Net property, plant and equipment

406.4

378.1

OG&E [Member] | Total Property Plant and Equipment [Member]

Public Utility, Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

16,104.3

15,125.2

Accumulated Depreciation

4,809.4

4,584.5

Net property, plant and equipment

11,294.9

10,540.7

OGE Energy [Member]

Public Utility, Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

6.1

Accumulated Depreciation

0.0

Net property, plant and equipment

$ 6.1

[1]	This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.
[2]	This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $78.3 million.
[3]	This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.1 million.
[4]	This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.0 million.

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	OG&E [Member]	Common Stock	Common Stock OG&E [Member]	Premium on Common Stock	Premium on Common Stock OG&E [Member]	Retained Earnings	Retained Earnings OG&E [Member]	Accumulated Other Comprehensive (Loss) Income	Treasury Stock
Balance at Dec. 31, 2020	$ 3,631.8	$ 3,975.6	$ 2.0	$ 100.9	$ 1,122.6	$ 938.6	$ 2,544.6	$ 2,936.1	$ (32.1)	$ (5.3)
Common Stock, Shares, Outstanding at Dec. 31, 2020			200.1	40.4
Treasury Stock, Common, Shares at Dec. 31, 2020										0.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	737.3	360.0	$ 0.0	$ 0.0	0.0	0.0	737.3	360.0	0.0	$ 0.0
Net income, Number of Shares			0.0	0.0						0.0
Other comprehensive income, net of tax, Number of Shares			0.0							0.0
Other comprehensive income, net of tax	7.3	0.0	$ 0.0		0.0		0.0		7.3	$ 0.0
Dividends declared on common stock, Number of Shares			0.0	0.0						0.0
Dividends declared on common stock	(326.5)	(265.0)	$ 0.0	$ 0.0	0.0	0.0	(326.5)	(265.0)	0.0	$ 0.0
Capital contribution from OGE Energy		530.0		$ 0.0		530.0		0.0
Capital contribution from OGE Energy, Number of Shares				0.0
Stock-based compensation, Number of Shares			0.0	0.0						(0.1)
Stock-based compensation	6.4	2.2	$ 0.0	$ 0.0	1.2	2.2	0.0	0.0	0.0	$ 5.2
Balance at Dec. 31, 2021	4,056.3	4,602.8	$ 2.0	$ 100.9	1,123.8	1,470.8	2,955.4	3,031.1	(24.8)	$ (0.1)
Common Stock, Shares, Outstanding at Dec. 31, 2021			200.1	40.4
Treasury Stock, Common, Shares at Dec. 31, 2021										0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	665.7	439.5	$ 0.0	$ 0.0	0.0	0.0	665.7	439.5	0.0	$ 0.0
Net income, Number of Shares			0.0	0.0						0.0
Other comprehensive income, net of tax, Number of Shares			0.0							0.0
Other comprehensive income, net of tax	12.9	0.0	$ 0.0		0.0		0.0		12.9	$ 0.0
Dividends declared on common stock, Number of Shares			0.0							0.0
Dividends declared on common stock	(330.2)		$ 0.0		0.0		(330.2)		0.0	$ 0.0
Stock-based compensation, Number of Shares			0.1							0.0
Stock-based compensation	8.7	2.9	$ 0.0	$ 0.0	8.7	2.9	0.0	0.0	0.0	$ 0.0
Balance at Dec. 31, 2022	$ 4,413.4	$ 5,045.2	$ 2.0	$ 100.9	1,132.5	1,473.7	3,290.9	3,470.6	(11.9)	$ (0.1)
Common Stock, Shares, Outstanding at Dec. 31, 2022	200.2	40.4	200.2	40.4
Treasury Stock, Common, Shares at Dec. 31, 2022	0.0									0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 416.8	$ 426.4	$ 0.0	$ 0.0	0.0	0.0	416.8	426.4	0.0	$ 0.0
Net income, Number of Shares			0.0	0.0						0.0
Other comprehensive income, net of tax, Number of Shares			0.0							0.0
Other comprehensive income, net of tax	4.7	0.0	$ 0.0		0.0		0.0		4.7	$ 0.0
Dividends declared on common stock, Number of Shares			0.0	0.0						0.0
Dividends declared on common stock	(334.0)	(500.0)	$ 0.0	$ 0.0	0.0	0.0	(334.0)	(500.0)	0.0	$ 0.0
Stock-based compensation, Number of Shares			0.1	0.0						0.0
Stock-based compensation	10.7	3.1	$ 0.0	$ 0.0	10.6	3.1	0.0	0.0	0.0	$ 0.1
Balance at Dec. 31, 2023	$ 4,511.6	$ 4,974.7	$ 2.0	$ 100.9	$ 1,143.1	$ 1,476.8	$ 3,373.7	$ 3,397.0	$ (7.2)	$ 0.0
Common Stock, Shares, Outstanding at Dec. 31, 2023	200.3	40.4	200.3	40.4
Treasury Stock, Common, Shares at Dec. 31, 2023	0.0									0.0

Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) shares in Millions		1 Months Ended	9 Months Ended	11 Months Ended	12 Months Ended
	Dec. 02, 2021	Dec. 31, 2021	Sep. 30, 2022	Dec. 02, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred Storm and Property Reserve Deficiency, Current					$ 2,700,000
Allowance for Doubtful Accounts Receivable					$ 2,200,000	$ 1,900,000
Provision for Depreciation Rate					2.80%	2.70%	2.60%
Depreciation expense					$ 421,600,000	$ 388,500,000	$ 361,500,000
Projected provision for depreciation in next fiscal year					2.80%
Percent Of Intangible Plant Balance Amortizable					45.70%
Percent Of Intangible Plant Balance Amortizable Three					10.20%
Percent of Intangible Plant Balance Amortizable					43.70%
Amortization of intangible assets, period					6 years 8 months 12 days
Amortization of Intangible Assets, Period					13 years 9 months 18 days
Amortization of Intangible Assets, Period					15 years
Amortization of Intangible Assets, Period					22 years 4 months 24 days
Percent of Intangible Plant Balance Amortizable Thereafter					0.40%
Accrued Environmental Loss Contingencies, Noncurrent					$ 27,500,000	$ 24,200,000
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration]					Other Liabilities, Noncurrent
Public Utilities, Allowance for Funds Used During Construction, Rate					7.00%	4.80%	7.40%
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party					$ 148,300,000	$ 135,500,000	$ 139,300,000
Equity Securities Sold During Period			95.4
Proceeds from Sales of Equity Securities			$ 1,067,200,000
Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI						282,100,000
Distributions received						34,000,000	73,400,000
Equity in earnings of unconsolidated affiliates				$ 169,800,000	0	0	169,800,000
Gain (Loss) on Disposition of Assets					0	0	344,400,000
Proceeds from Sales of Assets, Investing Activities	$ 35,000,000
Fees paid from disposition of assets	8,600,000
Expected Settlement Charge					4,100,000
Gas Transmission Equipment [Member]
Amount of Acquisition Adjustments					$ 3,300,000
Gas Transmission Equipment [Member] \| Minimum [Member]
Amortization of intangible assets, period					37 years
Gas Transmission Equipment [Member] \| Maximum [Member]
Amortization of intangible assets, period					59 years
Redbud Plant [Member]
Amortization of intangible assets, period					27 years
Amount of Acquisition Adjustments					$ 148,300,000	148,300,000
OG&E [Member]
Allowance for Doubtful Accounts Receivable					2,200,000	1,900,000
Capitalized Computer Software, Gross					203,100,000	143,200,000
Capitalized Computer Software, Amortization					$ 33,400,000	23,500,000	18,100,000
OG&E [Member] \| Minimum [Member]
Asset Retirement Obligations Accreted, Period					2 years
OG&E [Member] \| Maximum [Member]
Asset Retirement Obligations Accreted, Period					68 years
OGE Energy [Member]
Unrealized Gain (Loss) on Investments		$ (8,600,000)				0
Gain (Loss) on Disposition of Assets	344,400,000
OGE Energy [Member] \| Retained Earnings [Member]
Dividends, Common Stock					$ 500,000,000		265,000,000
OGE Energy [Member] \| Enable Midstream Partners [Member] \| Operating Costs Charged [Member]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party				$ 300,000
OGE Energy [Member] \| Enable Midstream Partners [Member] \| Employment Costs [Member]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party							$ 12,200,000
Energy Transfer
Proceeds from Sales of Assets, Investing Activities	5,000,000
CenterPoint [Member]
Proceeds from Sales of Assets, Investing Activities	$ 30,000,000
Public Utilities, Inventory, Fuel [Member]
Fuel inventories					$ 158,500,000	$ 108,800,000

Retirement Plans and Postretirement Benefit Plans - Defined Benefit Plan, Plan Assets, Category (Details) - USD ($)
$ in Millions

Dec. 31, 2023

Dec. 31, 2022

U.S. common stocks [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

$ 56.9

$ 71.9

U.S. treasury notes and bonds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

^[1]

42.4

44.6

Mortgage-backed securities

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

22.0

26.2

Corporate fixed income and other securities [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

54.6

65.5

Commingled fund [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

^[2]

13.8

18.2

Foreign government bonds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.2

0.5

Municipal Bonds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.3

0.9

Money Market Funds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

1.3

5.9

Interest and dividends receivable [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

1.4

1.6

Payable to broker for securities purchased [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

(14.2)

(25.2)

Mutual Funds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

55.3

60.4

Preferred Stock [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

1.0

1.5

Cash Collateral [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.3

Receivable (foreign currency) [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.1

Receivable from broker for securities sold [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

8.3

20.6

Total Plan investments [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

248.2

296.0

Plan Assets Attributable to Affiliates

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

(52.3)

(54.1)

Total Plan assets [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

243.7

293.0

Total Plan assets [Member] | Og and E [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

191.4

238.9

Fair Value, Inputs, Level 1 [Member] | U.S. common stocks [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

56.9

71.9

Fair Value, Inputs, Level 1 [Member] | U.S. treasury notes and bonds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

^[1]

42.4

44.6

Fair Value, Inputs, Level 1 [Member] | Mortgage-backed securities

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

Fair Value, Inputs, Level 1 [Member] | Corporate fixed income and other securities [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

Fair Value, Inputs, Level 1 [Member] | Commingled fund [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

^[2]

0.0

Fair Value, Inputs, Level 1 [Member] | Foreign government bonds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

Fair Value, Inputs, Level 1 [Member] | Municipal Bonds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

55.3

60.4

Fair Value, Inputs, Level 1 [Member] | Preferred Stock [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

1.0

1.5

Fair Value, Inputs, Level 1 [Member] | Cash Collateral [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.3

Fair Value, Inputs, Level 1 [Member] | Receivable (foreign currency) [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

Fair Value, Inputs, Level 1 [Member] | Total Plan investments [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

155.9

178.7

Fair Value, Inputs, Level 2 [Member] | U.S. common stocks [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

Fair Value, Inputs, Level 2 [Member] | U.S. treasury notes and bonds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

^[1]

0.0

Fair Value, Inputs, Level 2 [Member] | Mortgage-backed securities

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

22.0

26.2

Fair Value, Inputs, Level 2 [Member] | Corporate fixed income and other securities [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

54.6

65.5

Fair Value, Inputs, Level 2 [Member] | Commingled fund [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

^[2]

0.0

Fair Value, Inputs, Level 2 [Member] | Foreign government bonds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.2

0.5

Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.3

0.9

Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

Fair Value, Inputs, Level 2 [Member] | Preferred Stock [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

Fair Value, Inputs, Level 2 [Member] | Cash Collateral [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

Fair Value, Inputs, Level 2 [Member] | Receivable (foreign currency) [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.1

Fair Value, Inputs, Level 2 [Member] | Total Plan investments [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

77.2

93.2

Net Asset Value [Member] | U.S. common stocks [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

^[3]

Net Asset Value [Member] | U.S. treasury notes and bonds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

^[1]

0.0

^[3]

Net Asset Value [Member] | Mortgage-backed securities

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

^[3]

Net Asset Value [Member] | Corporate fixed income and other securities [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

^[3]

Net Asset Value [Member] | Commingled fund [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

^[2]

13.8

18.2

^[3]

Net Asset Value [Member] | Foreign government bonds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

^[3]

Net Asset Value [Member] | Municipal Bonds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

^[3]

Net Asset Value [Member] | Money Market Funds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

1.3

5.9

^[3]

Net Asset Value [Member] | Mutual Funds [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

^[3]

Net Asset Value [Member] | Preferred Stock [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

^[3]

Net Asset Value [Member] | Cash Collateral [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

^[3]

Net Asset Value [Member] | Receivable (foreign currency) [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

0.0

^[3]

Net Asset Value [Member] | Total Plan investments [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair Value of Plan Assets

$ 15.1

$ 24.1

^[3]

[1]	This category represents U.S. Treasury notes and bonds with a Moody's Investors Service rating of Aaa and Government Agency Bonds with a Moody's Investors Service rating of A1 or higher.
[2]	This category represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.
[3]	GAAP allows the measurement of certain investments that do not have a readily determinable fair value at the net asset value. These investments do not consider the observability of inputs; therefore, they are not included within the fair value hierarchy.

Short-Term Debt and Credit Facilities - Additional Information (Details) - USD ($)

Dec. 31, 2023

Dec. 31, 2022

Line of Credit Facility [Line Items]

Short-term debt

$ 499,200,000

$ 0

Acceleration of Indebtedness of Credit Facility

100,000,000

Nonpayment of Uninsured Judgments

100,000,000

Outstanding Intercompany Borrowings

85,100,000

OGE Energy [Member]

Line of Credit Facility [Line Items]

Line of Credit Facility, Current Borrowing Capacity

^[1]

$ 550,000,000

OGE Energy [Member] | Maximum [Member]

Line of Credit Facility [Line Items]

Ratio of Consolidated Debt to Consolidated Capitalization

70.00%

OG&E [Member]

Line of Credit Facility [Line Items]

Line of Credit Facility, Current Borrowing Capacity

^[2],[3]

$ 550,000,000

Short Term Borrowing Capacity That Has Regulatory Approval

$ 1,000,000,000

Ratio of Consolidated Debt to Consolidated Capitalization

65.00%

[1]	This bank facility is available to back up OGE Energy's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.
[2]	OG&E has an intercompany borrowing agreement with OGE Energy whereby OG&E has access to up to $450.0 million of OGE Energy's revolving credit amount. This agreement has a termination date of December 18, 2028. At December 31, 2023, there was $85.1 million in intercompany borrowings under this agreement.
[3]	This bank facility is available to back up OG&E's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.

Summary of Significant Accounting Policies - Schedule of Jointly Owned Utility Plants (Details) - USD ($)
$ in Millions

Dec. 31, 2023

Dec. 31, 2022

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

$ 16,110.4

$ 15,131.3

Accumulated Depreciation

4,809.4

4,584.5

Net property, plant and equipment

$ 11,301.0

$ 10,546.8

McClain Plant [Member]

Property, Plant and Equipment [Line Items]

Jointly Owned Utility Plant, Proportionate Ownership Share

77.00%

^[1]

77.00%

^[2]

Property, Plant and Equipment, Gross

$ 265.4

^[1]

$ 261.9

^[2]

Accumulated Depreciation

129.2

^[1]

119.4

^[2]

Net property, plant and equipment

$ 136.2

^[1]

$ 142.5

^[2]

Redbud Plant [Member]

Property, Plant and Equipment [Line Items]

Jointly Owned Utility Plant, Proportionate Ownership Share

51.00%

^[1],[3]

51.00%

^[2],[4]

Property, Plant and Equipment, Gross

$ 548.9

^[1],[3]

$ 542.1

^[2],[4]

Accumulated Depreciation

245.5

^[1],[3]

225.2

^[2],[4]

Net property, plant and equipment

303.4

^[1],[3]

316.9

^[2],[4]

OGE Energy [Member]

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

6.1

Accumulated Depreciation

0.0

Net property, plant and equipment

6.1

OG&E [Member]

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

16,104.3

15,125.2

Accumulated Depreciation

4,809.4

4,584.5

Net property, plant and equipment

11,294.9

10,540.7

OG&E [Member] | Total Property Plant and Equipment [Member]

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

16,104.3

15,125.2

Accumulated Depreciation

4,809.4

4,584.5

Net property, plant and equipment

11,294.9

10,540.7

OG&E [Member] | Electric Transmission and Distribution [Member]

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

6,290.1

5,781.3

Accumulated Depreciation

1,564.3

1,527.1

Net property, plant and equipment

4,725.8

4,254.2

OG&E [Member] | Electric Generation Equipment [Member]

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

5,295.9

^[5]

5,188.1

^[6]

Accumulated Depreciation

2,081.0

^[5]

1,982.7

^[6]

Net property, plant and equipment

3,214.9

^[5]

3,205.4

^[6]

OG&E [Member] | Electric Transmission [Member]

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

3,306.7

^[7]

3,180.5

^[8]

Accumulated Depreciation

707.6

^[7]

667.9

^[8]

Net property, plant and equipment

2,599.1

^[7]

2,512.6

^[8]

OG&E [Member] | Finite-Lived Intangible Assets, Major Class Name [Member]

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

568.5

384.0

Accumulated Depreciation

219.8

193.6

Net property, plant and equipment

348.7

190.4

OG&E [Member] | Property, Plant and Equipment, Other Types [Member]

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

643.1

591.3

Accumulated Depreciation

236.7

213.2

Net property, plant and equipment

$ 406.4

$ 378.1

[1]	Construction work in progress was $0.3 million and $2.0 million for the McClain and Redbud Plants, respectively.
[2]	Construction work in progress was $0.7 million and $1.5 million for the McClain and Redbud Plants, respectively.
[3]	This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.
[4]	This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $78.3 million.
[5]	This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.
[6]	This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $78.3 million.
[7]	This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.1 million.
[8]	This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.0 million.

Common Equity - Automatic Dividend Reinvestment and Stock Purchase Plan (Additional Information) (Details) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Stock Issued During Period, Shares, New Issues	82,321	27,278
Automatic Dividend Reinvestment and Stock Purchase Plan [Member]
Stock Issued During Period, Shares, New Issues	0
Shares Held in Reserve Related to Dividend Reinvestment Plan and Stock Purchase Plan	4,899,178

Retirement Plans and Postretirement Benefit Plans - Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, Beginning	$ 358.5	$ 502.9
Service cost	5.4	7.6
Interest cost	15.9	15.7
Plan settlements	(62.8)	(95.8)
Actuarial losses (gains)	0.8	(56.9)
Benefits paid	(14.1)	(15.0)
Benefit Obligation, Ending	303.7	358.5	$ 502.9
Pension Plans [Member] \| Og and E [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, Beginning	288.5	363.2
Service cost	4.4	6.2
Interest cost	12.6	12.1
Plan settlements	(57.7)	(38.8)
Actuarial losses (gains)	2.7	(41.3)
Benefits paid	(11.9)	(12.9)
Benefit Obligation, Ending	238.6	288.5	363.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	238.9	353.0
Actual return on plans' assets	22.1	(62.4)
Employer contributions	0.0	0.0
Plan settlements	(57.7)	(38.8)
Benefits paid	(11.9)	(12.9)
Fair Value of Plan Assets, Ending	191.4	238.9	353.0
Funded status at end of year	(47.2)	(49.6)
Accumulated Benefit Obligation	226.5	275.2
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Service cost	5.4	7.6	11.2
Interest cost	15.9	15.7	13.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	293.0	486.0
Actual return on plans' assets	27.6	(82.2)
Employer contributions	0.0	0.0
Plan settlements	(62.8)	(95.8)
Benefits paid	(14.1)	(15.0)
Fair Value of Plan Assets, Ending	243.7	293.0	486.0
Funded status at end of year	(60.0)	(65.5)
Accumulated Benefit Obligation	289.5	342.7
Pension Plans, Defined Benefit [Member] \| Og and E [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Service cost	4.4	6.2	7.7
Interest cost	12.6	12.1	9.7
Restoration of Retirement Income Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, Beginning	5.8	5.9
Service cost	1.0	1.1	0.8
Interest cost	0.3	0.2	0.1
Plan settlements	(1.4)	(1.5)
Actuarial losses (gains)	(0.2)	0.1
Benefits paid	0.0	0.0
Benefit Obligation, Ending	5.5	5.8	5.9
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	0.0	0.0
Actual return on plans' assets	0.0	0.0
Employer contributions	1.4	0.2
Plan settlements	(1.4)	(0.2)
Benefits paid	0.0	0.0
Fair Value of Plan Assets, Ending	0.0	0.0	0.0
Funded status at end of year	(5.5)	(5.8)
Accumulated Benefit Obligation	4.9	4.8
Restoration of Retirement Income Plan [Member] \| Og and E [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, Beginning	0.5	0.5
Service cost	0.0	0.0	0.0
Interest cost	0.0	0.0	0.0
Plan settlements	(0.7)	0.0
Actuarial losses (gains)	0.2	0.0
Benefits paid	0.0	0.0
Benefit Obligation, Ending	0.0	0.5	0.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	0.0	0.0
Actual return on plans' assets	0.0	0.0
Employer contributions	0.7	0.0
Plan settlements	(0.7)	0.0
Benefits paid	0.0	0.0
Fair Value of Plan Assets, Ending	0.0	0.0	0.0
Funded status at end of year	0.0	(0.5)
Accumulated Benefit Obligation	0.0	0.4
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, Beginning	101.9	137.3
Service cost	0.1	0.2	0.2
Interest cost	5.2	3.5	3.4
Participants' contributions	3.4	3.5
Actuarial losses (gains)	4.9	(29.1)
Benefits paid	(12.2)	(13.5)
Benefit Obligation, Ending	103.3	101.9	137.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	32.8	44.3
Actual return on plans' assets	1.9	(8.2)
Employer contributions	6.8	6.7
Participants' contributions	3.4	3.5
Benefits paid	(12.2)	(13.5)
Fair Value of Plan Assets, Ending	32.7	32.8	44.3
Accumulated Benefit Obligation	70.6	69.1
Other Postretirement Benefits Plan [Member] \| Og and E [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, Beginning	76.4	102.4
Service cost	0.1	0.1	0.1
Interest cost	3.9	2.7	2.6
Participants' contributions	2.4	2.4
Actuarial losses (gains)	4.0	(21.0)
Benefits paid	(9.5)	(10.2)
Benefit Obligation, Ending	77.3	76.4	102.4
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	29.8	39.9
Actual return on plans' assets	(1.7)	(7.4)
Employer contributions	5.2	5.1
Participants' contributions	2.4	2.4
Benefits paid	(9.5)	(10.2)
Fair Value of Plan Assets, Ending	29.6	29.8	$ 39.9
Accumulated Benefit Obligation	$ 47.7	$ 46.6

Stock-Based Compensation - Performance Units Total Shareholder Return Valuation Assumptions (Details) - Total Shareholder Return [Member] - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	213,442	216,437	249,909
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 43.74	$ 41.1	$ 38.14
Expected Dividend Rate	4.20%	4.80%	4.70%
Expected Volatility Rate	31.00%	29.00%	29.00%
Risk Free Interest Rate	4.47%	1.71%	0.22%
Expected Term	2 years 10 months 6 days	2 years 10 months 6 days	2 years 10 months 2 days
Og and E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	65,069	60,923	68,720
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 43.74	$ 41.1	$ 38.14
Expected Dividend Rate	4.20%	4.80%	4.70%
Expected Volatility Rate	31.00%	29.00%	29.00%
Risk Free Interest Rate	4.47%	1.71%	0.22%
Expected Term	2 years 10 months 6 days	2 years 10 months 6 days	2 years 10 months 6 days

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Short-Term Debt and Credit Facilities

12 Months Ended

Dec. 31, 2023

Short-Term Debt [Abstract]

Short-Term Debt and Credit Facilities

10. Short-Term Debt and Credit Facilities

The Registrants borrow on a short-term basis, as necessary, by the issuance of commercial paper and by borrowings under their revolving credit agreements. OGE Energy also borrows under term credit agreements maturing in one year or less, as necessary.

The following table presents information regarding the Registrants' revolving credit agreements at December 31, 2023.


Entity	Aggregate Commitment		Amount Outstanding (A)		Weighted-Average Interest Rate				Expiration
	(In millions)
OGE Energy (B)	$	550.0	$	499.2		5.78	%	(F)	December 18, 2028 (G)
OGE Energy (C)		50.0		—		—		(F)	May 24, 2025
OG&E (D)(E)		550.0		0.4		1.20	%	(F)	December 18, 2028 (G)
Total	$	1,150.0	$	499.6		5.77	%

(A)

Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at December 31, 2023.

(B)

This bank facility is available to back up OGE Energy's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.

(C)

OGE Energy has a $100.0 million floating rate unsecured three-year credit agreement, of which $50.0 million is considered a revolving loan and $50.0 million is considered a term loan. The credit agreement, under certain circumstances, may be increased to a maximum commitment limit of $135.0 million and includes a maximum leverage ratio of 0.65 to 1.0. The other covenants under this credit agreement are substantially the same as OGE Energy's existing $550.0 million revolving credit agreement.

(D)

This bank facility is available to back up OG&E's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.

(E)

OG&E has an intercompany borrowing agreement with OGE Energy whereby OG&E has access to up to $450.0 million of OGE Energy's revolving credit amount. This agreement has a termination date of December 18, 2028. At December 31, 2023, there was $85.1 million in intercompany borrowings under this agreement. At December 31, 2023, OG&E had $147.7 million in advances from parent.

(F)

Represents the weighted-average interest rate for the outstanding borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit.

(G)

In December 2022, the Registrants entered into an amendment to their credit facility that gave each of the Registrants the option of extending such commitments for up to two additional one-year periods. On December 18, 2023, the Registrants utilized the first extension option for an additional one-year period extending the term until December 2028.

OGE Energy's credit facility has a financial covenant requiring that OGE Energy maintains a maximum debt to capitalization ratio of 70 percent, as defined in such facility. OG&E's credit facility has a financial covenant requiring that OG&E maintains a maximum debt to capitalization ratio of 65 percent, as defined in such facility. The Registrants' facilities each also contain covenants which restrict the respective borrower and certain of its subsidiaries in respect of, among other things, mergers and consolidations, sales of all or substantially all assets, incurrence of liens and transactions with affiliates. The Registrants' facilities are each subject to acceleration upon the occurrence of any default, including, among others, payment defaults on such facilities, breach of representations, warranties and covenants, acceleration of indebtedness (other than intercompany and non-recourse indebtedness) of $100.0 million or more in the aggregate, change of control (as defined in each such facility), nonpayment of uninsured judgments in excess of $100.0 million and the occurrence of certain Employee Retirement Income Security Act and bankruptcy events, subject where applicable to specified cure periods.

The Registrants' ability to access the commercial paper market could be adversely impacted by a credit ratings downgrade or major market disruptions. Pricing grids associated with the Registrants' credit facilities could cause annual fees and borrowing rates to increase if an adverse rating impact occurs. The impact of any future downgrade could include an increase in the costs of the Registrants' short-term borrowings, but a reduction in the Registrants' credit ratings would not result in any defaults or accelerations. Any future downgrade could also lead to higher long-term borrowing costs and, if below investment grade, would require the Registrants to post collateral or letters of credit.

OG&E must obtain regulatory approval from the FERC in order to borrow on a short-term basis. OG&E has the necessary regulatory approvals to incur up to $1.0 billion in short-term borrowings at any one time for a two-year period beginning January 1, 2023 and ending December 31, 2024.

Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
Revenue Recognition (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 2,607.3	$ 3,304.2	$ 3,588.7
Provision for Rate Refund
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2.0	(1.2)	0.0
Integrated Market
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	71.6	163.8	468.9
Transmission
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	143.0	131.7	140.2
Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	41.6	20.8	1.1
Residential
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,008.6	1,272.6	1,309.1
Commercial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	674.6	803.3	749.1
Industrial
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	229.6	317.3	323.1
Oilfield
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	207.8	304.3	312.8
Public Authority and Street Light
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	228.5	291.6	284.4
System Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 2,349.1	$ 2,989.1	$ 2,978.5

Stock-Based Compensation - Schedule of Pre-tax Compensation Expense and Related Income Tax Benefit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	$ 13.1	$ 9.7	$ 9.8
Income tax benefit	3.2	2.3	2.5
OG&E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	3.1	2.9	2.2
Income tax benefit	0.7	0.7	0.6
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	9.3	7.2	7.5
Performance Units [Member] \| OG&E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	2.2	2.2	1.8
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	3.8	2.5	2.3
Restricted Stock Units (RSUs) [Member] \| OG&E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	$ 0.9	$ 0.7	$ 0.4

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Retirement Plans and Postretirement Benefit Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer expected contribution	$ 10,000,000
Ultimate Health Care Cost Trend Rate	4.50%
Postemployment Benefits Liability	$ 1,700,000	$ 1,800,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	200.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	5.00%
Defined Contribution Plan, Cost	$ 19,600,000	17,100,000	$ 15,400,000
Maximum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of increase in annual medical inflation cost	5.00%
Og and E [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Postemployment Benefits Liability	$ 1,300,000	1,300,000
Defined Contribution Plan, Cost	16,000,000	13,900,000	12,000,000
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	$ 6,800,000	6,700,000
Health Care Cost Trend Rate Assumed for Next Fiscal Year	6.75%
Fair Value of Plan Assets	$ 32,700,000	32,800,000	44,300,000
Other Postretirement Benefits Plan [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	0	0
Other Postretirement Benefits Plan [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	16,800,000	21,600,000
Other Postretirement Benefits Plan [Member] \| Og and E [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	5,200,000	5,100,000
Fair Value of Plan Assets	29,600,000	29,800,000	39,900,000
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	0	0
Fair Value of Plan Assets	243,700,000	293,000,000	$ 486,000,000
Pension Plan [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	$ 0	$ 0

Summary of Significant Accounting Policies - Summary of Changes to Asset Retirement Obligation (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]

Balance at January 1

$ 78.3

$ 80.2

Accretion expense

0.7

0.6

Liabilities settled

^[1]

0.0

(2.5)

Revisions in estimated cash flows

^[2]

2.3

0.0

Balance at December 31

$ 81.3

$ 78.3

[1]	(A) Asset retirement obligations were settled for asbestos removal at OG&E's generating facilities.
[2]	(B) Assumptions changed related to the estimated timing and estimated cost of the removal of asbestos at OG&E's generating facilities.

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues from contracts with customers	$ 2,607.3	$ 3,304.2	$ 3,588.7
Other revenues	67.0	71.5	65.0
Operating revenues	2,674.3	3,375.7	3,653.7
FUEL, PURCHASED POWER AND DIRECT TRANSMISSION EXPENSE	911.7	1,662.4	2,127.6
OPERATING EXPENSES
Other operation and maintenance	502.6	501.4	463.1
Depreciation and amortization	506.6	460.9	416.0
Taxes other than income	103.2	101.5	102.8
Operating expenses	1,112.4	1,063.8	981.9
OPERATING INCOME	650.2	649.5	544.2
OTHER INCOME (EXPENSE)
Allowance for equity funds used during construction	19.4	6.9	6.7
Other net periodic benefit income (expense)	5.6	(12.9)	(6.1)
Gain (loss) on equity securities (Note 1)	0.0	282.1	(8.6)
Equity in earnings of unconsolidated affiliates	0.0	0.0	169.8
Gain on Enable/Energy Transfer transaction, net	0.0	0.0	344.4
Other income	48.2	74.6	26.3
Other expense	(29.0)	(44.6)	(39.9)
Net other income	44.2	306.1	492.6
INTEREST EXPENSE
Interest on long-term debt	205.0	162.1	154.8
Allowance for borrowed funds used during construction	(7.1)	(4.0)	(3.5)
Interest on short-term debt and other interest charges	23.5	8.2	7.0
Interest expense	221.4	166.3	158.3
INCOME BEFORE TAXES	473.0	789.3	878.5
INCOME TAX EXPENSE	56.2	123.6	141.2
NET INCOME	$ 416.8	$ 665.7	$ 737.3
BASIC AVERAGE COMMON SHARES OUTSTANDING	200.3	200.2	200.1
DILUTED AVERAGE COMMON SHARES OUTSTANDING	200.9	200.8	200.3
BASIC EARNINGS PER AVERAGE COMMON SHARE	$ 2.08	$ 3.33	$ 3.68
DILUTED EARNINGS PER AVERAGE COMMON SHARE	$ 2.07	$ 3.32	$ 3.68
Other comprehensive income, net of tax	$ 4.7	$ 12.9	$ 7.3
Comprehensive income	421.5	678.6	744.6
OG&E [Member]
Revenues from contracts with customers	2,607.3	3,304.2	3,558.7
Other revenues	67.0	71.5	65.0
Operating revenues	2,674.3	3,375.7	3,653.7
FUEL, PURCHASED POWER AND DIRECT TRANSMISSION EXPENSE	911.7	1,662.4	2,127.6
OPERATING EXPENSES
Other operation and maintenance	505.0	491.9	464.7
Depreciation and amortization	506.6	460.9	416.0
Taxes other than income	99.4	98.0	99.3
Operating expenses	1,111.0	1,050.8	980.0
OPERATING INCOME	651.6	662.5	546.1
OTHER INCOME (EXPENSE)
Allowance for equity funds used during construction	19.4	6.9	6.7
Other net periodic benefit income (expense)	6.5	1.2	(4.3)
Other income	23.9	6.5	7.1
Other expense	(6.3)	(3.4)	(1.8)
Net other income	43.5	11.2	7.7
INTEREST EXPENSE
Interest on long-term debt	200.4	157.4	152.7
Allowance for borrowed funds used during construction	(7.1)	(4.0)	(3.5)
Interest on short-term debt and other interest charges	6.6	4.4	2.8
Interest expense	199.9	157.8	152.0
INCOME BEFORE TAXES	495.2	515.9	401.8
INCOME TAX EXPENSE	68.8	76.4	41.8
NET INCOME	426.4	439.5	360.0
Other comprehensive income, net of tax	0.0	0.0	0.0
Comprehensive income	$ 426.4	$ 439.5	$ 360.0

Leases - Schedule of Financial Statement Information of Lease Liabilities (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Operating Leased Assets [Line Items]

Operating lease cost

$ 6.4

$ 5.9

$ 6.3

Operating cash flows for operating leases

5.2

5.3

6.3

Right-of-use assets obtained in exchange for new operating lease liabilities

0.0

1.5

0.0

Right-of-use assets at period end

^[1]

$ 25.9

$ 30.2

Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]

Property, Plant and Equipment, Net

Operating lease liabilities at period end

^[2]

$ 30.5

$ 34.8

Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]

Liabilities, Other than Long-Term Debt, Noncurrent

Operating lease weighted-average remaining lease term (in years)

11 years 4 months 24 days

11 years 7 months 6 days

Operating lease weighted-average discount rate

4.00%

OG&E [Member]

Operating Leased Assets [Line Items]

Operating lease cost

$ 6.4

$ 5.9

5.7

Operating cash flows for operating leases

5.2

5.3

5.7

Right-of-use assets obtained in exchange for new operating lease liabilities

0.0

1.5

$ 0.0

Right-of-use assets at period end

^[1]

$ 25.9

$ 30.2

Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]

Property, Plant and Equipment, Net

Operating lease liabilities at period end

^[2]

$ 30.5

$ 34.8

Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]

Liabilities, Other than Long-Term Debt, Noncurrent

Operating lease weighted-average remaining lease term (in years)

11 years 4 months 24 days

11 years 7 months 6 days

Operating lease weighted-average discount rate

4.00%

[1]	Included in Property, Plant and Equipment in the Registrants' balance sheets.
[2]	Included in Other Deferred Credits and Other Liabilities in the Registrants' balance sheets.

Common Equity (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Schedule of Earnings Per Share Basic and Diluted

The following table presents the calculation of basic and diluted earnings per share for OGE Energy.


(In millions except per share data)	2023		2022		2021
Net income	$	416.8	$	665.7	$	737.3
Average common shares outstanding:
Basic average common shares outstanding		200.3		200.2		200.1
Effect of dilutive securities:
Contingently issuable shares (performance and restricted stock units)		0.6		0.6		0.2
Diluted average common shares outstanding		200.9		200.8		200.3
Basic earnings per average common share	$	2.08	$	3.33	$	3.68
Diluted earnings per average common share	$	2.07	$	3.32	$	3.68
Anti-dilutive shares excluded from earnings per share calculation		—		—		—

Income Taxes - Schedule of Unrecognized Tax Benefits Roll Forward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes [Line Items]
Unrecognized Tax Benefits, Beginning Balance	$ 20.7	$ 22.4	$ 21.9
Additions	7.9	0.0	1.7
Reductions	0.0	(1.7)	(1.2)
Unrecognized Tax Benefits, Ending Balance	$ 28.6	$ 20.7	$ 22.4

Summary of Significant Accounting Policies Summary of Significant Accounting Policies Reclassifications (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Prior Period Reclassification Adjustment	$ 109.3	$ 83.4

Related Party Disclosures (Tables)

12 Months Ended

Dec. 31, 2023

The following table presents summarized related party transactions between OG&E and Enable during the period of January 1, 2021 through December 2, 2021.


(In millions)
Operating revenues:
Electricity to power electric compression assets	$	13.3
Fuel, purchased power and direct transmission expense:
Natural gas transportation services	$	32.7
Natural gas sales	$	(33.5	)

Summary of Significant Accounting Policies - Summary of Components of Benefit Obligation (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Regulatory Asset, Noncurrent	$ 577.6	$ 524.3
Pension Plan [Member] \| Defined Benefit Plans Income Loss [Member]
Components of Benefit Obligation Regulatory Asset	75.9	110.0
Other Postretirement Benefits Plan [Member] \| Defined Benefit Plans Income Loss [Member]
Components of Benefit Obligation Regulatory Asset	13.5	9.7
Benefit obligations regulatory asset [Member]
Regulatory Asset, Noncurrent	$ 89.4	$ 119.7

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
CURRENT ASSETS
Cash and cash equivalents	$ 0.2	$ 88.1
Accounts receivable	208.8	250.1
Accrued unbilled revenues	72.7	74.2
Income taxes receivable	18.2	20.7
Fuel inventories	158.5	108.8
Materials and supplies, at average cost	254.3	180.5
Fuel clause under recoveries	0.0	514.9
Other	58.8	103.5
Total current assets	771.5	1,340.8
OTHER PROPERTY AND INVESTMENTS
Other	114.0	105.8
Total other property and investments	114.0	105.8
PROPERTY, PLANT AND EQUIPMENT
In service	15,588.2	14,695.2
Construction work in progress	522.2	436.1
Total property, plant and equipment	16,110.4	15,131.3
Less: accumulated depreciation	4,809.4	4,584.5
Net property, plant and equipment	11,301.0	10,546.8
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	577.6	524.3
Other	26.6	27.0
Total deferred charges and other assets	604.2	551.3
TOTAL ASSETS	12,790.7	12,544.7
CURRENT LIABILITIES
Short-term debt	499.2	0.0
Accounts payable	276.4	448.9
Dividends payable	83.8	82.9
Customer deposits	103.5	88.8
Accrued taxes	47.6	54.0
Accrued interest	57.4	41.1
Accrued compensation	46.8	37.0
Long-term debt due within one year	0.0	999.9
Fuel clause over recoveries	20.5	0.0
Other	44.0	49.6
Total current liabilities	1,179.2	1,802.2
LONG-TERM DEBT	4,340.5	3,548.7
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	172.7	176.9
Deferred income taxes	1,300.8	1,233.5
Deferred investment tax credits	11.3	12.0
Regulatory liabilities	1,061.6	1,147.1
Other	213.0	210.9
Total deferred credits and other liabilities	2,759.4	2,780.4
Total liabilities	8,279.1	8,131.3
COMMITMENTS AND CONTINGENCIES (NOTE 13)
STOCKHOLDERS' EQUITY
Common stockholders' equity	1,145.1	1,134.5
Retained earnings	3,373.7	3,290.9
Accumulated other comprehensive loss, net of tax	(7.2)	(11.9)
Treasury stock, at cost	0.0	(0.1)
Total stockholders' equity	4,511.6	4,413.4
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	12,790.7	12,544.7
OG&E [Member]
CURRENT ASSETS
Cash and cash equivalents	0.2	0.0
Accounts receivable	208.8	249.4
Accrued unbilled revenues	72.7	74.2
Advances to parent	0.0	91.0
Fuel inventories	158.5	108.8
Materials and supplies, at average cost	254.3	180.5
Fuel clause under recoveries	0.0	514.9
Other	46.7	97.8
Total current assets	741.2	1,316.6
OTHER PROPERTY AND INVESTMENTS
Total other property and investments	4.6	4.4
PROPERTY, PLANT AND EQUIPMENT
In service	15,582.1	14,689.1
Construction work in progress	522.2	436.1
Total property, plant and equipment	16,104.3	15,125.2
Less: accumulated depreciation	4,809.4	4,584.5
Net property, plant and equipment	11,294.9	10,540.7
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	577.6	524.3
Other	24.3	24.5
Total deferred charges and other assets	601.9	548.8
TOTAL ASSETS	12,642.6	12,410.5
CURRENT LIABILITIES
Accounts payable	228.5	395.8
Advances from parent	147.7	0.0
Customer deposits	103.5	88.8
Accrued taxes	47.2	46.5
Accrued interest	56.6	40.8
Accrued compensation	37.0	27.8
Long-term debt due within one year	0.0	500.0
Fuel clause over recoveries	20.5	0.0
Other	43.6	49.3
Total current liabilities	684.6	1,149.0
LONG-TERM DEBT	4,290.6	3,498.9
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	96.2	98.3
Deferred income taxes	1,340.8	1,271.1
Deferred investment tax credits	11.3	12.0
Regulatory liabilities	1,061.6	1,147.1
Other	182.8	188.9
Total deferred credits and other liabilities	2,692.7	2,717.4
Total liabilities	7,667.9	7,365.3
COMMITMENTS AND CONTINGENCIES (NOTE 13)
STOCKHOLDERS' EQUITY
Common stockholders' equity	1,577.7	1,574.6
Retained earnings	3,397.0	3,470.6
Total stockholders' equity	4,974.7	5,045.2
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 12,642.6	$ 12,410.5

Schedule II (Tables)

12 Months Ended

Dec. 31, 2023

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II Valuation and Qualifying Accounts


			Additions
Description	Balance at Beginning of Period		Charged to Costs and Expenses		Deductions (A)		Balance at End of Period
	(in millions)
Balance at December 31, 2021
Reserve for Uncollectible Accounts	$	2.6	$	3.2	$	3.4	$	2.4
Balance at December 31, 2022
Reserve for Uncollectible Accounts	$	2.4	$	2.8	$	3.3	$	1.9
Balance at December 31, 2023
Reserve for Uncollectible Accounts	$	1.9	$	5.7	$	5.4	$	2.2

(A)

Uncollectible accounts receivable written off, net of recoveries.

Report of Business Segments

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Report of Business Segments

12. Report of Business Segments

OGE Energy reports its operations primarily through a single segment, captioned "electric company," which is engaged in the generation, transmission, distribution and sale of electric energy. The "other operations" caption primarily includes the operations of the holding company and other energy-related investments. Intersegment revenues are recorded at prices comparable to those of unaffiliated customers and are affected by regulatory considerations. Prior to the Enable and Energy Transfer merger closing on December 2, 2021, OGE Energy's natural gas midstream operations segment included its equity method investment in Enable. During 2022, OGE Energy held an investment in Energy Transfer's equity securities and reported the investment's activity, as well as Enable legacy pension and postretirement costs, through the natural gas midstream operations segment. As of the end of September 2022, OGE Energy sold all of Energy Transfer's limited partner units; therefore, beginning in 2023, OGE Energy no longer has a natural gas midstream operations segment. The following tables present the results of OGE Energy's business segments for the years ended December 31, 2023, 2022 and 2021.


2023	Electric Company		Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	2,674.3	$	—		$	—		$	2,674.3
Fuel, purchased power and direct transmission expense		911.7		—			—			911.7
Other operation and maintenance		505.0		(2.4	)		—			502.6
Depreciation and amortization		506.6		—			—			506.6
Taxes other than income		99.4		3.8			—			103.2
Operating income (loss)		651.6		(1.4	)		—			650.2
Other income		43.5		8.1			(7.4	)		44.2
Interest expense		199.9		28.9			(7.4	)		221.4
Income tax expense (benefit)		68.8		(12.6	)		—			56.2
Net income (loss)	$	426.4	$	(9.6	)	$	—		$	416.8
Total assets	$	12,642.6	$	301.1		$	(153.0	)	$	12,790.7
Capital expenditures	$	1,178.2	$	—		$	—		$	1,178.2


2022	Electric Company		Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	3,375.7	$	—		$	—		$	—		$	3,375.7
Fuel, purchased power and direct transmission expense		1,662.4		—			—			—			1,662.4
Other operation and maintenance		491.9		12.6			(3.1	)		—			501.4
Depreciation and amortization		460.9		—			—			—			460.9
Taxes other than income		98.0		0.1			3.4			—			101.5
Operating income (loss)		662.5		(12.7	)		(0.3	)		—			649.5
Gain on equity securities		—		282.1			—			—			282.1
Other income		11.2		10.0			4.9			(2.1	)		24.0
Interest expense		157.8		—			10.6			(2.1	)		166.3
Income tax expense (benefit)		76.4		48.1			(0.9	)		—			123.6
Net income (loss)	$	439.5	$	231.3		$	(5.1	)	$	—		$	665.7
Total assets	$	12,410.5	$	1.2		$	683.7		$	(550.7	)	$	12,544.7
Capital expenditures	$	1,050.9	$	—		$	—		$	—		$	1,050.9


2021	Electric Company		Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	3,653.7	$	—		$	—		$	—		$	3,653.7
Fuel, purchased power and direct transmission expense		2,127.6		—			—			—			2,127.6
Other operation and maintenance		464.7		1.6			(3.2	)		—			463.1
Depreciation and amortization		416.0		—			—			—			416.0
Taxes other than income		99.3		0.2			3.3			—			102.8
Operating income (loss)		546.1		(1.8	)		(0.1	)		—			544.2
Equity in earnings of unconsolidated affiliates		—		169.8			—			—			169.8
Gain on Enable/Energy Transfer transaction, net		—		344.4			—			—			344.4
Other income (expense)		7.7		(26.4	)		(2.0	)		(0.9	)		(21.6	)
Interest expense		152.0		—			7.2			(0.9	)		158.3
Income tax expense (benefit)		41.8		101.0			(1.6	)		—			141.2
Net income (loss)	$	360.0	$	385.0		$	(7.7	)	$	—		$	737.3
Total assets	$	11,688.0	$	786.6		$	350.3		$	(218.5	)	$	12,606.4
Capital expenditures	$	778.5	$	—		$	—		$	—		$	778.5

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-15

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
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+ Details

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Accounts receivable, allowance for credit loss	$ 2.2	$ 1.9
OG&E [Member]
Accounts receivable, allowance for credit loss	$ 2.2	$ 1.9

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Postretirement plans:
Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest	$ 0.0	$ 0.0	$ 0.3
Pension Plans [Member]
Pension Plan and Restoration of Retirement Income Plan:
Amortization of prior service cost, net of tax of $0.1, $0.1 and $0.0, respectively	0.1	0.1	0.0
Amortization of deferred net loss, net of tax of $0.2, $0.2 and $0.9, respectively	0.2	0.2	0.9
Net gain (loss) arising during the period, net of tax of $1.0, ($2.4) and $0.0, respectively	1.0	(2.4)	0.0
Prior service cost arising during the period, net of tax of $0.0, $0.0 and ($0.3), respectively	0.0	0.0	(0.3)
Settlement cost, net of tax of $0.4, $4.3 and $2.7, respectively	0.4	4.3	2.7
Other Postretirement Benefits Plan [Member]
Postretirement plans:
Amortization of prior service credit, net of tax of $0.0, ($0.1) and ($0.4), respectively	0.0	(0.1)	(0.4)
Amortization of deferred net (gain) loss, net of tax of ($0.1), $0.0 and $0.0, respectively	(0.1)	0.0	0.0
Net gain (loss) arising during the period, net of tax of ($0.2), $1.7 and ($0.2), respectively	$ (0.2)	$ 1.7	$ (0.2)

Income Taxes (Additional Information) (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Line Items]
Reserve related to state tax position	$ 7,900,000
Unrecognized Tax Benefits	28,600,000	$ 20,700,000	$ 22,400,000	$ 21,900,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0	0	0
Og and E [Member]
Income Taxes [Line Items]
Unrecognized Tax Benefits	22,600,000	16,400,000	$ 18,100,000
Deferred Tax Asset [Member]
Income Taxes [Line Items]
Unrecognized Tax Benefits	$ 14,700,000
Deferred Tax Asset [Member] \| OGE Energy [Member]
Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance		$ 2,700,000

Rate Matters and Regulation

12 Months Ended

Dec. 31, 2023

Regulated Operations [Abstract]

Rate Matters and Regulation

14. Rate Matters and Regulation

Regulation and Rates

OG&E's retail electric tariffs are regulated by the OCC in Oklahoma and by the APSC in Arkansas. The issuance of certain securities by OG&E is also regulated by the OCC and the APSC. OG&E's transmission activities, short-term borrowing authorization and accounting practices are subject to the jurisdiction of the FERC. The Secretary of the U.S. Department of Energy has jurisdiction over some of OG&E's facilities and operations. In 2023, 86 percent of OG&E's electric revenue was subject to the jurisdiction of the OCC, eight percent to the APSC and six percent to the FERC.

The OCC and the APSC require that, among other things, (i) OGE Energy permits the OCC and the APSC access to the books and records of OGE Energy and its affiliates relating to transactions with OG&E; (ii) OGE Energy employ accounting and other procedures and controls to protect against subsidization of non-utility activities by OG&E's customers; and (iii) OGE Energy refrain from pledging OG&E assets or income for affiliate transactions. In addition, the FERC has access to the books and records of OGE Energy and its affiliates as the FERC deems relevant to costs incurred by OG&E or necessary or appropriate for the protection of utility customers with respect to the FERC jurisdictional rates.

Completed Regulatory Matters

APSC Proceedings

Arkansas 2022 Formula Rate Plan Filing

In October 2022, OG&E filed its fifth evaluation report under its Formula Rate Plan, and on February 1, 2023, OG&E and the APSC Staff filed a non-unanimous joint settlement agreement, which included an annual electric revenue increase of $9.6 million. The Arkansas Attorney General and the Arkansas Valley Electric Consumers agreed not to oppose the settlement. On March 2, 2023, the APSC issued a final order approving the non-unanimous settlement agreement, and new rates became effective April 1, 2023.

Horseshoe Lake Modernization Plan

On July 12, 2023, OG&E filed an application at the APSC seeking authorization to commence construction of two combustion turbines totaling 448 megawatts at its existing Horseshoe Lake generating facility. The Horseshoe Lake project is expected to cost approximately $331 million, excluding financing costs and property taxes, and the new generating units are expected to be placed into service in late 2026. Arkansas law requires a public utility to seek approval from the APSC to commence construction of a power-generating facility located outside the boundaries of the state of Arkansas. The APSC Staff filed direct testimony on September 15, 2023 recommending that the APSC grant OG&E approval to construct the combustion turbines, subject to a prudence review in a future proceeding. On October 16, 2023, the APSC issued an order which states that OG&E has complied with applicable Arkansas law and may commence construction of the Horseshoe Lake generating facility.

OCC Proceedings

2021 Oklahoma Fuel Prudency

On July 1, 2022, the OCC Public Utility Division Staff filed their application initiating the review of the 2021 fuel adjustment clause and prudence review. On February 21, 2023, a Joint Stipulation and Settlement Agreement was filed, and the OCC approved the Settlement Agreement on April 20, 2023. The Settlement Agreement provides that: (i) OG&E's practices, policies and judgment for fuel procurement during 2021 were prudent; (ii) OG&E's power purchase costs and expenses, monthly fuel filings and processes and fuel-related investments and decisions for 2021 were fair, just and reasonable and (iii) OG&E exercised prudent judgment pertaining to all such matters and that the electric generation, purchased power and fuel procurement expenses were prudently incurred. Further, the stipulating parties agreed to certain revisions of the fuel clause adjustment tariff, including a revised semi-annual fuel clause adjustment factor redetermination process which will be subject to the OCC Public Utility Division approval or denial. Pursuant to the Settlement Agreement, OG&E submitted new fuel factors to the OCC on October 10, 2023 and met with stakeholders on October 12, 2023. This adjustment was estimated to result in an average monthly residential bill decrease of approximately $21 beginning November 1, 2023.

Horseshoe Lake Modernization Plan

On May 31, 2023, OG&E filed an application at the OCC seeking approval for the cost associated with the purchase and installation of two combustion turbines totaling 448 megawatts at its existing Horseshoe Lake generating facility. The Horseshoe Lake project is expected to cost approximately $331 million, excluding financing costs and property taxes, and the new generating units are expected to be placed into service in late 2026. On November 21, 2023, the OCC approved a non-unanimous, non-contested Joint Stipulation and Settlement Agreement that was entered into by OG&E and certain intervenors, which allows for recovery of the jurisdictional portion of expenses up to $275 million, plus financing costs and property taxes, related to this project through a recovery mechanism when the new generating units are placed into service. In accordance with the settlement agreement, OG&E is required to file a

general rate review to include the new generating units in base rates no later than one year after the implementation of the recovery mechanism.

SPP Proceedings

Planning Reserve Margin

On July 26, 2022, the SPP Board of Directors approved a planning reserve margin increase from 12 percent to 15 percent that each load serving entity, such as OG&E, must maintain. This change was effective for the summer of 2023. OG&E secured short-term bilateral contracts for the capacity needed to satisfy the 2023 requirements brought about by the increase to the SPP’s planning reserve margin.

Pending Regulatory Matters

Various proceedings pending before state or federal regulatory agencies are described below. Unless stated otherwise, the Registrants cannot predict when the regulatory agency will act or what action the regulatory agency will take. The Registrants' financial results are dependent in part on timely and constructive decisions by the regulatory agencies that set OG&E's rates.

APSC Proceedings

2023 Formula Rate Plan Filing

On October 2, 2023, OG&E filed its final evaluation report under its Formula Rate Plan, including a request to increase its Arkansas retail revenues by $4.7 million. On December 28, 2023, the APSC Staff filed testimony recommending an annual electric revenue increase of $3.5 million. No other party filed testimony responsive to OG&E's proposed rate adjustment. On January 30, 2024, OG&E and the APSC Staff filed an uncontested joint settlement agreement, which included an annual electric revenue increase of $3.5 million. The APSC is expected to issue a final order in this matter in March 2024, with new rates to be effective April 1, 2024.

Capacity Power Purchase Agreement Cost Recovery

On October 4, 2023, OG&E filed an application at the APSC seeking approval of a methodology for recovery of capacity costs associated with short-term power purchase agreements entered into to meet capacity needs in each of the years between 2023 and 2027. On December 29, 2023, the Administrative Law Judge issued an order authorizing OG&E to defer to a regulatory asset its capacity costs associated with short-term power purchase agreements for 2023, along with a carrying charge at the commission-approved customer deposit interest rate. The order requires OG&E and the parties to the case to develop a procedural schedule to address treatment for any expenses beyond the calendar year 2023.

FERC Proceedings

Order for Sponsored Transmission Upgrades within SPP

Under Attachment Z2 of the SPP Open Access Transmission Tariff, costs of participant-funded, or "sponsored," transmission upgrades may be recovered from other SPP customers whose transmission service depends on capacity enabled by the upgrade. The SPP Tariff required the SPP to charge for these upgrades beginning in 2008, but the SPP did not begin charging its customers for these upgrades until 2016 due to information system limitations. At that time, the SPP sought a waiver of a time limitation in its tariff that otherwise would have prevented it from waiting until 2016 to bill for the 2008 through 2015 period. The FERC granted the waiver, and the SPP then billed OG&E as a user for these Z2 charges while simultaneously crediting OG&E as a sponsor of Z2 transmission upgrades, resulting in OG&E being a net recipient of sponsored upgrade credits. The majority of these net credits were refunded to customers through OG&E's various rate riders that include SPP activity with the remaining amounts retained by OG&E.

Several companies that were net payers of Z2 charges sought rehearing of the FERC's 2016 order approving the waiver and then appealed it. While that appeal was pending, the FERC obtained a remand and then reversed itself and ruled that the SPP tariff provision that prohibited the 2008 through 2015 charges could not be waived. It ordered the SPP to develop a plan to refund the payments but not to implement the refunds until further ordered to do so. In response, in April 2019, OG&E filed a request for rehearing at the FERC.

The next month, it also filed a Complaint at the FERC against the SPP contending that the SPP and not OG&E should bear the cost of any refunds resulting from the SPP's tariff violation and that SPP’s actions also violated its contracts with OG&E. In February 2020, the FERC denied OG&E's request for rehearing but did not consider SPP's refund plan. No date for payment of refunds was established. In August 2021, the U.S. Court of Appeals for the District of Columbia Circuit denied OG&E's petition for review of the FERC's order denying the waiver and requiring refunds. After denying rehearing of its ruling, the court of appeals returned the matter in November 2021 to the FERC for further proceedings in accordance with its opinion. The FERC has not acted on that remand.

If the FERC proceeds to order refunds in full, OG&E estimates it would be required to refund $13.0 million, which is net of amounts paid to other utilities for upgrades and would be subject to interest at the FERC-approved rate. The SPP has stated in filings with the FERC both before and after the court of appeals decision that there are considerable complexities in implementing the refunds that will have to be resolved before they can be paid. Payment of refunds would shift recovery of these upgrade credits to future periods. The SPP filed a report on January 4, 2022 confirming that administering refunds would be complex and could take years unless the SPP is allowed to make certain simplifying assumptions. The SPP also urged that all pending complaint proceedings, including OG&E's complaint and three similar complaints against the SPP, be resolved before any refund process is ordered to begin. OG&E and other parties filed responses to the SPP report, and the matter remains pending at the FERC. Of the $13.0 million, the Registrants would be impacted by $5.0 million in expense that initially benefited the Registrants in 2016, and OG&E customers would incur a net impact of $8.0 million in expense through rider mechanisms or the FERC formula rate. As of December 31, 2023, the Registrants' reserve remains at $13.0 million plus estimated interest for a potential refund.

In November 2022, the FERC issued an order denying OG&E's complaint against the SPP. It also issued orders granting the other three complaints against the SPP in part but awarded no relief. All four complainants timely sought rehearing of these orders. On June 27, 2023, the FERC made final its orders granting in part complaints filed against the SPP by OG&E and three other project sponsors (or groups thereof) on claims arising from the SPP’s failure to implement Attachment Z2 so that project sponsors could be paid as required under the tariff, but awarding no relief. OG&E and the other complainants have appealed to the U.S. Court of Appeals for the Eighth Circuit, where the matter has been briefed and is awaiting the scheduling of oral argument. It will likely be decided by the summer of 2024.

In June 2020, the FERC approved, effective July 1, 2020, an SPP proposal to eliminate Attachment Z2 revenue crediting and replace it with a different rate mechanism that would provide project sponsors, such as OG&E, the same level of recovery. This elimination of the Attachment Z2 revenue crediting would only prospectively impact OG&E and its recovery of any future upgrade costs that it may incur as a project sponsor subsequent to July 2020. All of the existing projects that are eligible to receive revenue credits under Attachment Z2 will remain eligible, which includes the $13.0 million that is at issue in the remand from OG&E's appeal and in OG&E's complaint proceeding.

OCC Proceedings

Oklahoma Retail Electric Supplier Certified Territory Act Causes

As previously disclosed, several rural electric cooperative electricity suppliers filed complaints with the OCC alleging that OG&E, because it was providing service to large loads in another supplier's territory, had violated the Oklahoma Retail Electric Supplier Certified Territory Act. OG&E believes it is lawfully serving customers under specific exemptions under this act that allow it to serve customers having a load of one megawatt or greater. There were five complaint cases initiated at the OCC, and the OCC issued decisions on each of them. The OCC ruled in favor of the electric cooperatives in three of those cases under statutory interpretation and ruled in favor of OG&E in two of those cases under injunctive theory. All five of those cases were appealed to the Oklahoma Supreme Court.

On April 4, 2023, the Oklahoma Supreme Court issued its opinion which vacated the OCC's injunctions with respect to four of the cases and held that the Oklahoma Retail Electric Supplier Certified Territory Act does not limit the mechanism by which OG&E may provide service to large loads in another supplier's territory pursuant to the one megawatt exception. The one pending legal issue left for the Oklahoma Supreme Court to resolve is a statutory interpretation on how a supplier calculates "connected load for initial full operation" for purposes of the exemption under the act. If the Oklahoma Supreme Court ultimately were to find that the customers being served in this single case are not exempted from the Oklahoma Retail Electric Supplier Certified Territory Act, OG&E would have to evaluate the recoverability of some plant investments made to serve these customers and may also be required to reimburse the certified territory supplier in this case for an amount of lost revenue. Such amounts would not be expected to be material to the Registrants' results of operations.

2022 Oklahoma Fuel Prudency

On June 29, 2023, the Public Utility Division Staff filed their application initiating the review of the 2022 fuel adjustment clause and prudence review. OG&E filed its minimum filing requirements and supporting testimony on August 29, 2023. The OCC Staff filed testimony on January 19, 2024 recommending that the OCC find OG&E's 2022 fuel costs prudent.

2023 Oklahoma General Rate Review

On December 29, 2023, OG&E filed a general rate review in Oklahoma seeking a rate increase of $332.5 million and a 10.5 percent return on equity based on a common equity percentage of 53.50 percent. The rate review seeks recovery of $1.3 billion of net capital investment since the last general rate review. A hearing on the merits is scheduled for June 17, 2024.

SPP Proceedings

Resource Capacity Accreditation

In July 2022, the SPP Board of Directors approved a new unit accreditation methodology for conventional generation which requires submittal to and approval from the FERC prior to becoming effective. On March 2, 2023, the FERC rejected the SPP’s proposed capacity accreditation methodology for wind and solar generators. Following the FERC’s rejection, the SPP began an extensive review of both the methodology proposed for thermal resources which had not yet been submitted to the FERC, and the accreditation methodology for wind and solar generators. These methodologies were reviewed and approved by both the Regional State Committee and the SPP Board of Directors in late October 2023 and will be submitted to the FERC for approval. If approved by the FERC, both methodologies are expected to be effective in 2026 and may contribute to OG&E’s incremental capacity needs.

CONSOLIDATED STATEMENTS OF CAPITALIZATION - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Schedule of Capitalization, Long-term Debt [Line Items]
Common Stock, Value	$ 2.0	$ 2.0
Premium on common stock	1,143.1	1,132.5
Retained earnings	3,373.7	3,290.9
Accumulated other comprehensive loss, net of tax	(7.2)	(11.9)
Treasury Stock, Value	0.0	(0.1)
Total stockholders' equity	4,511.6	4,413.4
Unamortized debt expense	(27.9)	(22.2)
Unamortized discount	(11.2)	(8.9)
Total long-term debt	4,340.5	4,548.6
Less: long-term debt due within one year	0.0	(999.9)
Total long-term debt (excluding long-term debt due within one year)	4,340.5	3,548.7
Total capitalization (including long-term debt due within one year)	8,852.1	8,962.0
Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Common Stock, Value	100.9	100.9
Premium on common stock	1,476.8	1,473.7
Retained earnings	3,397.0	3,470.6
Total stockholders' equity	4,974.7	5,045.2
Unamortized debt expense	(27.8)	(21.9)
Unamortized discount	(11.2)	(8.9)
Total long-term debt	4,290.6	3,998.9
Less: long-term debt due within one year	0.0	(500.0)
Total long-term debt (excluding long-term debt due within one year)	4,290.6	3,498.9
Total capitalization (including long-term debt due within one year)	9,265.3	9,044.1
Senior Notes [Member] \| Series Due May 26, 2023 [Member] \| OGE Energy [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	0.0	500.0
Senior Notes [Member] \| Series Due May 26, 2023 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	0.0	500.0
Senior Notes [Member] \| Series Due July 15, 2027 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	125.0	125.0
Senior Notes [Member] \| Series Due April 15, 2028 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	100.0	100.0
Senior Notes [Member] \| Series Due August 15, 2028 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	400.0	400.0
Senior Notes [Member] \| Series Due March 15, 2030 \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	300.0	300.0
Senior Notes [Member] \| Series Due April 1, 2030 \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	300.0	300.0
Senior Notes [Member] \| Series Due January 15, 2033 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	450.0	0.0
Senior Notes [Member] \| Series Due January 15, 2036 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	110.0	110.0
Senior Notes [Member] \| Series Due February 1, 2038 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	200.0	200.0
Senior Notes [Member] \| Series Due June 1, 2040 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	250.0	250.0
Senior Notes [Member] \| Series Due May 15, 2041 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	250.0	250.0
Senior Notes [Member] \| Series Due May 1, 2043 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	250.0	250.0
Senior Notes [Member] \| Series Due March 15, 2044 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	250.0	250.0
Senior Notes [Member] \| Series Due December 15, 2044 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	250.0	250.0
Senior Notes [Member] \| Series due April 1, 2047 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	300.0	300.0
Senior Notes [Member] \| Series due August 15, 2047 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	300.0	300.0
Senior Notes [Member] \| Series Due April 1, 2053 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	350.0	0.0
Term Loan [Member] \| Due May 24, 2025 \| OGE Energy [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	50.0	50.0
Long-term Debt [Member] \| Due August 31, 2062 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	9.2	9.3
Debentures Subject to Mandatory Redemption [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Total long-term debt	135.4
Debentures Subject to Mandatory Redemption [Member] \| Garfield Industrial Authority Bond [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	47.0	47.0
Debentures Subject to Mandatory Redemption [Member] \| Muskogee Industrial Authority Bond Due 2025 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	32.4	32.4
Debentures Subject to Mandatory Redemption [Member] \| Muskogee Industrial Authority Bond Due 2027 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term Debt, Gross	$ 56.0	$ 56.0

Leases - Schedule of Maturity Analysis of Operating Lease Liabilities (Details) - USD ($)
$ in Millions

Dec. 31, 2023

Dec. 31, 2022

Operating Leased Assets [Line Items]

$ 3.7

3.5

3.0

3.0

3.1

22.6

Total future minimum lease payments

38.9

Less: Imputed interest

8.4

Present value of net minimum lease payments

^[1]

30.5

$ 34.8

OG&E [Member]

Operating Leased Assets [Line Items]

3.7

3.5

3.0

3.0

3.1

22.6

Total future minimum lease payments

38.9

Less: Imputed interest

8.4

Present value of net minimum lease payments

^[1]

$ 30.5

$ 34.8

[1]	Included in Other Deferred Credits and Other Liabilities in the Registrants' balance sheets.

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Significant Accounting Policies

1. Summary of Significant Accounting Policies

Organization

OGE Energy is a holding company whose primary investment provides electricity in Oklahoma and western Arkansas. OGE Energy's electric company operations are conducted through its wholly-owned subsidiary, OG&E, which generates, transmits, distributes and sells electric energy in Oklahoma and western Arkansas and are reported through OGE Energy's electric company business segment. OG&E's rates are subject to regulation by the OCC, the APSC and the FERC. OG&E was incorporated in 1902 under the laws of the Oklahoma Territory and is the largest electric company in Oklahoma, with a franchised service territory that includes Fort Smith, Arkansas and the surrounding communities. OG&E sold its retail natural gas business in 1928 and is no longer engaged in the natural gas distribution business.

The accounts of OGE Energy and its wholly-owned subsidiaries, including OG&E, are included in OGE Energy's consolidated financial statements. All intercompany transactions and balances are eliminated in such consolidation.

During 2022, OGE Energy accounted for its investment in Energy Transfer as an investment in equity securities and reported the Energy Transfer investment, along with legacy Enable seconded employee pension and postretirement costs, through OGE Energy's natural gas midstream operations segment. As of the end of September 2022, OGE Energy sold all of its Energy Transfer limited partner units. Therefore, beginning in 2023, OGE Energy no longer has a natural gas operations reporting segment. Prior to OGE Energy's sale of all Energy Transfer limited partner units, the investment in Energy Transfer's equity securities was held through wholly-owned subsidiaries and ultimately OGE Holdings.

Accounting Records

The accounting records of OG&E are maintained in accordance with the Uniform System of Accounts prescribed by the FERC and adopted by the OCC and the APSC. Additionally, OG&E, as a regulated electric company, is subject to accounting principles for certain types of rate-regulated activities, which provide that certain incurred costs that would otherwise be charged to expense can be deferred as regulatory assets, based on the expected recovery from customers in future rates. Likewise, certain actual or anticipated credits that would otherwise reduce expense can be deferred as regulatory liabilities, based on the expected flowback to customers

in future rates. Management's expected recovery of deferred costs and flowback of deferred credits generally results from specific decisions by regulators granting such ratemaking treatment.

OG&E records certain incurred costs and obligations as regulatory assets or liabilities if, based on regulatory orders or other available evidence, it is probable that the costs or obligations will be included in amounts allowable for recovery or refund in future rates.

The following table presents a summary of OG&E's regulatory assets and liabilities.


December 31 (In millions)	2023		2022
REGULATORY ASSETS
Current:
Oklahoma Energy Efficiency Rider under recoveries (A)	$	3.8	$	7.7
Oklahoma fuel clause under recoveries		—		474.3
Arkansas fuel clause under recoveries		—		40.6
Other (A)		2.7		4.7
Total current regulatory assets	$	6.5	$	527.3
Non-current:
Oklahoma deferred storm expenses	$	261.1	$	206.3
Pension tracker		91.9		57.2
Benefit obligations regulatory asset		89.4		119.7
Arkansas Winter Storm Uri costs		71.0		78.2
Sooner Dry Scrubbers		17.2		18.1
Arkansas deferred pension expenses		12.7		12.3
Unamortized loss on reacquired debt		7.2		8.0
COVID-19 impacts		6.8		7.7
Oklahoma SAP S/4 HANA deferred expenses		6.0		0.7
Frontier Plant deferred expenses		3.6		5.2
Other		10.7		10.9
Total non-current regulatory assets	$	577.6	$	524.3
REGULATORY LIABILITIES
Current:
Oklahoma fuel clause over recoveries	$	15.6	$	—
SPP cost tracker over recovery (B)		10.4		3.0
Arkansas fuel clause over recoveries		4.9		—
Other (B)		2.3		2.5
Total current regulatory liabilities	$	33.2	$	5.5
Non-current:
Income taxes refundable to customers, net	$	838.0	$	894.7
Accrued removal obligations, net		222.0		250.5
Other		1.6		1.9
Total non-current regulatory liabilities	$	1,061.6	$	1,147.1

(A)

Included in Other Current Assets in the balance sheets.

(B)

Included in Other Current Liabilities in the balance sheets.

OG&E recovers program costs related to the Energy Efficiency Program in Oklahoma through the Energy Efficiency Rider, which operates on a three-year program cycle. The current program cycle, which runs through 2024, includes recovery of (i) energy efficiency program costs, (ii) lost revenues associated with certain achieved energy efficiency and demand savings, (iii) performance-based incentives and (iv) costs associated with research and development investments.

OG&E includes in expense any Oklahoma storm-related operation and maintenance expenses up to $2.7 million annually and defers to a regulatory asset any additional expenses incurred over $2.7 million. OG&E typically recovers the amounts deferred each year over a five to ten year period in accordance with historical practice.

OG&E recovers specific amounts of pension and postretirement medical costs in rates approved in its Oklahoma rate reviews. In accordance with approved orders, OG&E defers the difference between actual pension and postretirement medical expenses and the amount approved in its last Oklahoma rate review as a regulatory asset or regulatory liability. These amounts have been recorded in the Pension tracker regulatory asset in the table above and are being recovered over a 15 year period.

The benefit obligations regulatory asset is comprised of expenses recorded which are probable of future recovery and that have not yet been recognized as components of net periodic benefit cost, including net loss and prior service cost. These expenses are recorded as a regulatory asset, as OG&E historically has recovered and currently recovers pension and postretirement benefit plan expense in its electric rates. If, in the future, the regulatory bodies indicate a change in policy related to the recovery of pension and postretirement benefit plan expenses, this could cause the benefit obligations regulatory asset balance to be reclassified to accumulated other comprehensive income.

The following table presents a summary of the components of the benefit obligations regulatory asset.


December 31 (In millions)	2023		2022
Pension Plan and Restoration of Retirement Income Plan:
Net loss	$	75.9	$	110.0
Postretirement Benefit Plans:
Net loss		13.5		9.7
Total	$	89.4	$	119.7

In February 2021, Winter Storm Uri resulted in record winter peak demand for electricity and extremely high natural gas and purchased power prices in OG&E's service territory. In January 2023, the APSC ordered OG&E to amortize the deferred costs in a regulatory asset balance over 10 years using a weighted average cost of capital as a carrying charge.

As approved by the OCC, OG&E deferred the non-fuel incremental operation and maintenance expenses, depreciation, debt cost associated with the capital investment and related ad valorem taxes for the Dry Scrubbers at Sooner Units 1 and 2 as a regulatory asset, and these costs are being recovered over 25 years.

Arkansas includes a certain level of pension expense in base rates. When the Pension Plan experiences a settlement, which represents an acceleration of future pension costs, OG&E defers to a regulatory asset the Arkansas jurisdictional portion of each settlement, which historically has been recovered from customers over the average life of the remaining plan participants. A portion of these settlements is being recovered in current rates, and recovery of additional amounts will be requested as additional settlements occur. For additional information related to settlements, see Note 11.

Unamortized loss on reacquired debt is comprised of unamortized debt issuance costs related to the early retirement of OG&E's long-term debt. These amounts are recorded in interest expense and are being amortized over the term of the long-term debt which replaced the previous long-term debt. The unamortized loss on reacquired debt is recovered as a part of OG&E's cost of capital.

In response to the COVID-19 pandemic, the OCC and APSC issued orders allowing OG&E to defer certain expenses related to its COVID-19 response, such as incremental expenses that were related to the suspension of or delay in disconnection of service and additional expenses associated with ensuring the continuity of electric utility service. As approved by the OCC, OG&E is recovering the Oklahoma jurisdictional portion of these costs over five years.

As approved by the OCC, OG&E established a regulatory asset to defer the Oklahoma jurisdictional portion of operation and maintenance costs associated with OG&E's SAP S/4 HANA enterprise resource planning system project. These costs will be included for consideration in a future rate proceeding.

OG&E deferred to a regulatory asset the Oklahoma jurisdictional portion of costs, including non-fuel operation and maintenance expenses, depreciation, taxes other than income taxes and a return on capital, for its investment in the Frontier plant. As approved by the OCC, OG&E is recovering these costs over a five year period.

Fuel clause under and over recoveries are generated from OG&E's customers when OG&E's cost of fuel either exceeds or is less than the amount billed to its customers, respectively. OG&E's fuel recovery clauses are designed to smooth the impact of fuel price volatility on customers' bills. As a result, OG&E under recovers fuel costs in periods of rising fuel prices above the baseline charge for

fuel and over recovers fuel costs when prices decline below the baseline charge for fuel. Provisions in the fuel clauses are intended to allow OG&E to amortize under and over recovery balances.

OG&E recovers certain SPP costs related to base plan charges from its customers and refunds certain SPP revenues received to its customers in Oklahoma through the SPP cost tracker and in Arkansas through the transmission cost recovery rider.

Income taxes refundable to customers, net, primarily represents the reduction in accumulated deferred income taxes that resulted from the reduction in the federal income tax rate as part of the Tax Cuts and Jobs Act of 2017 as well as other state tax rate changes, partially offset by income taxes recoverable from customers primarily related to the equity component of the allowance for funds used during construction. These net liabilities will be returned to customers in varying amounts over approximately 80 years, and the assets will be amortized over the estimated remaining life of the assets to which they relate, as the temporary differences that generated the income tax benefits turn-around.

Accrued removal obligations, net represents asset removal costs previously recovered from ratepayers.

Management continuously monitors the future recoverability of regulatory assets. When in management's judgment future recovery becomes impaired, the amount of the regulatory asset is adjusted, as appropriate. If OG&E were required to discontinue the application of accounting principles for certain types of rate-regulated activities for some or all of its operations, it could result in writing off the related regulatory assets or liabilities, which could have significant financial effects.

Use of Estimates

In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and contingent liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Changes to these assumptions and estimates could have a material effect on the Registrants' financial statements. However, the Registrants believe they have taken reasonable positions where assumptions and estimates are used in order to minimize the negative financial impact to the Registrants that could result if actual results vary from the assumptions and estimates. In management's opinion, the areas where the most significant judgment is exercised include the determination of pension and postretirement plan assumptions, income taxes, contingency reserves, and regulatory assets and liabilities.

Cash and Cash Equivalents

For purposes of the financial statements, the Registrants consider all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents. These investments are carried at cost, which approximates fair value.

Allowance for Uncollectible Accounts Receivable

Customer balances are generally written off if not collected within six months after the final billing date. The allowance for uncollectible accounts receivable for OG&E is generally calculated by multiplying the last six months of electric revenue by the provision rate, which is based on a 12-month historical average of actual balances written off and is adjusted for current conditions and supportable forecasts as necessary. To the extent the historical collection rates, when incorporating forecasted conditions, are not representative of future collections, there could be an effect on the amount of uncollectible expense recognized. Also, a portion of the uncollectible provision related to fuel within the Oklahoma jurisdiction is being recovered through the fuel adjustment clause. The allowance for uncollectible accounts receivable is a reduction to Accounts Receivable in the balance sheets and is included in Other Operation and Maintenance Expense in the statements of income. The allowance for uncollectible accounts receivable was $2.2 million and $1.9 million at December 31, 2023 and 2022, respectively.

New business customers are required to provide a security deposit in the form of cash, bond or irrevocable letter of credit that is refunded when the account is closed. New residential customers whose outside credit scores indicate an elevated risk are required to provide a security deposit that is refunded based on customer protection rules defined by the OCC and the APSC. The payment behavior of all existing customers is continuously monitored, and, if the payment behavior indicates sufficient risk within the meaning of the applicable utility regulation, customers will be required to provide a security deposit.

Fuel Inventories

Fuel inventories for the generation of electricity consist of coal, natural gas, oil and alternative fuel. OG&E uses the weighted-average cost method of accounting for inventory that is physically added to or withdrawn from storage or stockpiles. OG&E held $158.5 million and $108.8 million of fuel inventory at December 31, 2023 and 2022, respectively.

Property, Plant and Equipment

All property, plant and equipment is recorded at cost. Newly constructed plant is added to plant balances at cost which includes contracted services, direct labor, materials, overhead, transportation costs and the allowance for funds used during construction. Replacements of units of property are capitalized as plant. For assets that belong to a common plant account, the replaced plant is removed from plant balances, and the cost of such property net of any salvage proceeds is charged to Accumulated Depreciation. For assets that do not belong to a common plant account, the replaced plant is removed from plant balances with the related accumulated depreciation, and the remaining balance net of any salvage proceeds is recorded as a loss in the statements of income as Other Expense. Repair and replacement of minor items of property are included in the statements of income as Other Operation and Maintenance Expense.

The following tables present OG&E's ownership interest in the jointly-owned McClain Plant and the jointly-owned Redbud Plant, and, as disclosed below, only OG&E's ownership interest is reflected in the property, plant and equipment and accumulated depreciation balances in these tables. The owners of the remaining interests in the McClain Plant and the Redbud Plant are responsible for providing their own financing of capital expenditures. Also, only OG&E's proportionate interests of any direct expenses of the McClain Plant and the Redbud Plant, such as fuel, maintenance expense and other operating expenses, are included in the applicable financial statement captions in the statements of income.


December 31, 2023 (In millions)	Percentage Ownership			Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
McClain Plant (A)		77	%	$	265.4	$	129.2	$	136.2
Redbud Plant (A)(B)		51	%	$	548.9	$	245.5	$	303.4

(A)

Construction work in progress was $0.3 million and $2.0 million for the McClain and Redbud Plants, respectively.

(B)

This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.


December 31, 2022 (In millions)	Percentage Ownership			Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
McClain Plant (A)		77	%	$	261.9	$	119.4	$	142.5
Redbud Plant (A)(B)		51	%	$	542.1	$	225.2	$	316.9

(A)

Construction work in progress was $0.7 million and $1.5 million for the McClain and Redbud Plants, respectively.

(B)

This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $78.3 million.

The following tables present the Registrants' major classes of property, plant and equipment and related accumulated depreciation.


December 31, 2023 (In millions)	Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
OG&E:
Distribution assets	$	6,290.1	$	1,564.3	$	4,725.8
Electric generation assets (A)		5,295.9		2,081.0		3,214.9
Transmission assets (B)		3,306.7		707.6		2,599.1
Intangible plant		568.5		219.8		348.7
Other property and equipment		643.1		236.7		406.4
OG&E property, plant and equipment		16,104.3		4,809.4		11,294.9
Non-OG&E property, plant and equipment		6.1		—		6.1
Total OGE Energy property, plant and equipment	$	16,110.4	$	4,809.4	$	11,301.0

(A)

This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.

(B)

This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.1 million.


December 31, 2022 (In millions)	Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
OG&E:
Distribution assets	$	5,781.3	$	1,527.1	$	4,254.2
Electric generation assets (A)		5,188.1		1,982.7		3,205.4
Transmission assets (B)		3,180.5		667.9		2,512.6
Intangible plant		384.0		193.6		190.4
Other property and equipment		591.3		213.2		378.1
OG&E property, plant and equipment		15,125.2		4,584.5		10,540.7
Non-OG&E property, plant and equipment		6.1		—		6.1
Total OGE Energy property, plant and equipment	$	15,131.3	$	4,584.5	$	10,546.8

(A)

This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $78.3 million.

(B)

This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.0 million.

OG&E's unamortized computer software costs, included in intangible plant above, were $203.1 million and $143.2 million at December 31, 2023 and 2022, respectively. OG&E's amortization expense for computer software costs was $33.4 million, $23.5 million and $18.1 million for the years ended December 31, 2023, 2022 and 2021, respectively.

Depreciation and Amortization

Depreciation expense was $421.6 million, $388.5 million and $361.5 million for the years ended December 31, 2023, 2022 and 2021, respectively. The provision for depreciation, which was 2.8 percent, 2.7 percent and 2.6 percent of the average depreciable utility plant for 2023, 2022 and 2021, respectively, is calculated using the straight-line method over the estimated service life of the associated assets. Depreciation is provided at the unit level for production plant and at the account or sub-account level for all other plant and is based on the average life group method. In 2024, the provision for depreciation is projected to be 2.8 percent of the average depreciable utility plant.

Amortization of intangible assets is calculated using the straight-line method. Of the remaining amortizable intangible plant balance at December 31, 2023, 45.7 percent will be amortized over 6.7 years, 43.7 percent will be amortized over 13.8 years, 10.2 percent will be amortized over 15.0 years, and the remaining 0.4 percent will be amortized over 22.4 years.

Amortization of plant acquisition adjustments is provided on a straight-line basis over the estimated remaining service life of the acquired assets. Plant acquisition adjustments include $148.3 million for the Redbud Plant, which is being amortized over a 27 year life, and $3.3 million for certain transmission substation facilities in OG&E's service territory, which is being amortized over a 37 to 59-year period.

Asset Retirement Obligations

OG&E has asset retirement obligations primarily associated with the removal of company-owned wind turbines on leased land, as well as the removal of asbestos from certain power generating stations. OG&E has recorded asset retirement obligations that are being accreted over their respective lives ranging from two to 68 years. Asset retirement obligations are included in Other Deferred Credits and Other Liabilities in the Registrants' balance sheets.

The following table presents changes to OG&E's asset retirement obligations during the years ended December 31, 2023 and 2022.


(In millions)	2023		2022
Balance at January 1	$	78.3	$	80.2
Accretion expense		0.7		0.6
Liabilities settled (A)		—		(2.5	)
Revisions in estimated cash flows (B)		2.3		—
Balance at December 31	$	81.3	$	78.3

(A) Asset retirement obligations were settled for asbestos removal at OG&E's generating facilities.

(B) Assumptions changed related to the estimated timing and estimated cost of the removal of asbestos at OG&E's generating facilities.

Accruals for environmental costs are recognized when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated. Costs are charged to expense or deferred as a regulatory asset based on expected recovery from customers in future rates, if they relate to the remediation of conditions caused by past operations or if they are not expected to mitigate or prevent contamination from future operations. Where environmental expenditures relate to facilities currently in use, such as pollution control equipment, the costs may be capitalized and depreciated over the future service periods. Estimated remediation costs are recorded at undiscounted amounts, independent of any insurance or rate recovery, based on prior experience, assessments and current technology. Accrued obligations are regularly adjusted as environmental assessments and estimates are revised and remediation efforts proceed. For sites where OG&E has been designated as one of several potentially responsible parties, the amount accrued represents OG&E's estimated share of the cost. OG&E had $27.5 million and $24.2 million in accrued environmental liabilities at December 31, 2023 and 2022, respectively, which are included in OG&E's asset retirement obligations.

Allowance for Funds Used During Construction

Allowance for funds used during construction, a non-cash item, is reflected as an increase to Net Other Income and a reduction to Interest Expense in the statements of income and as an increase to Construction Work in Progress in the balance sheets. Allowance for funds used during construction is calculated according to the FERC requirements for the imputed cost of equity and borrowed funds. Allowance for funds used during construction rates, compounded semi-annually, were 7.0 percent, 4.8 percent and 7.4 percent for the years ended December 31, 2023, 2022 and 2021, respectively.

Collection of Sales Tax

In the normal course of its operations, OG&E collects sales tax from its customers. OG&E records a current liability for sales taxes when it bills its customers and eliminates this liability when the taxes are remitted to the appropriate governmental authorities. OG&E excludes the sales tax collected from its operating revenues.

Revenue Recognition

General

OG&E recognizes revenue from electric sales when power is delivered to customers. The performance obligation to deliver electricity is generally created and satisfied simultaneously, and the provisions of the regulatory-approved tariff determine the charges OG&E may bill the customer, payment due date and other pertinent rights and obligations of both parties. OG&E measures its customers' metered usage and sends bills to its customers throughout each month. As a result, there is a significant amount of customers' electricity consumption that has not been billed at the end of each month. OG&E accrues an estimate of the revenues for electric sales delivered since the latest billings. Unbilled revenue is presented in Accrued Unbilled Revenues in the balance sheets and in Revenues from Contracts with Customers in the statements of income based on estimates of usage and prices during the period. The estimates that management uses in this calculation could vary from the actual amounts to be paid by customers.

Integrated Market and Transmission

OG&E currently owns and operates transmission and generation facilities as part of a vertically integrated utility. OG&E is a member of the SPP regional transmission organization and has transferred operational authority, but not ownership, of OG&E's transmission facilities to the SPP. The SPP has implemented FERC-approved regional day-ahead and real-time markets for energy and operating services, as well as associated transmission congestion rights. Collectively, the three markets operate together under the global name, SPP Integrated Marketplace. OG&E represents owned and contracted generation assets and customer load in the SPP Integrated Marketplace for the sole benefit of its customers. OG&E has not participated in the SPP Integrated Marketplace for any speculative trading activities.

OG&E records the SPP Integrated Marketplace transactions as sales or purchases per FERC Order 668, which requires that purchases and sales be recorded on a net basis for each settlement period of the SPP Integrated Marketplace. Purchases and sales are based on the fixed transaction price determined by the market at the time of the purchase or sale and the MWh quantity purchased or sold. These results are reported as Revenues from Contracts with Customers or Fuel, Purchased Power and Direct Transmission Expense in the statements of income. OG&E's revenues, expenses, assets and liabilities may be adversely affected by changes in the organization, operating and regulation by the FERC or the SPP.

OG&E's transmission revenues are generated by the use of OG&E's transmission network by the SPP, which operates the network, on behalf of other transmission owners. OG&E recognizes revenue on the sale of transmission service to its customers over time as the service is provided in the amount OG&E has a right to invoice. Transmission service to the SPP is billed monthly based on a fixed transaction price determined by OG&E's FERC-approved formula transmission rates along with other SPP-specific charges and the megawatt quantity reserved.

Other Revenues

Other Revenues in the statements of income is comprised of certain rider revenue that includes alternative revenue measures as defined in ASC 980, "Regulated Operations," which details two types of alternative revenue programs. The first type adjusts billings for the effects of weather abnormalities or broad external factors or to compensate OG&E for demand-side management initiatives (i.e., no-growth plans and similar conservation efforts). The second type provides for additional billings (i.e., incentive awards) for the achievement of certain objectives, such as reducing costs, reaching specified milestones or demonstratively improving customer service. Once the specific events permitting billing of the additional revenues under either program type have been completed, OG&E recognizes the additional revenues if (i) the program is established by an order from OG&E's regulatory commission that allows for automatic adjustment of future rates; (ii) the amount of additional revenues for the period is objectively determinable and is probable of recovery; and (iii) the additional revenues will be collected within 24 months following the end of the annual period in which they are recognized.

Fuel Adjustment Clauses

The actual cost of fuel used in electric generation and certain purchased power costs are generally recoverable from OG&E's customers through fuel adjustment clauses. The fuel adjustment clauses are subject to periodic review by the OCC and the APSC.

Leases

The Registrants evaluate all contracts under ASC 842 to determine if the contract is or contains a lease and to determine classification as an operating or finance lease. If a lease is identified, the Registrants recognize a right-of-use asset and a lease liability in their balance sheets. The Registrants recognize and measure a lease liability when they conclude the contract contains an identified asset that the Registrants control through having the right to obtain substantially all of the economic benefits and the right to direct the use of the identified asset. The liability is equal to the present value of lease payments, and the asset is based on the liability, subject to adjustment, such as for initial direct costs. Further, the Registrants utilize an incremental borrowing rate for purposes of measuring lease liabilities, if the discount rate is not implicit in the lease. To calculate the incremental borrowing rate, the Registrants start with a current pricing report for their senior unsecured notes, which indicates rates for periods reflective of the lease term, and adjust for the effects of collateral to arrive at the secured incremental borrowing rate. As permitted by ASC 842, the Registrants made an accounting policy election to not apply the balance sheet recognition requirements to short-term leases and to not separate lease components from non-lease components when recognizing and measuring lease liabilities. For income statement purposes, the Registrants record operating lease expense on a straight-line basis.

Income Taxes

OGE Energy files consolidated income tax returns in the U.S. federal jurisdiction and various state jurisdictions. OG&E is a part of the consolidated tax return of OGE Energy. Income taxes are generally allocated to each company in the affiliated group, including OG&E, based on its stand-alone taxable income or loss. Federal investment tax credits previously claimed on electric company property have been deferred and will be amortized to income over the life of the related property. The Registrants use the asset and liability method of accounting for income taxes. Under this method, a deferred tax asset or liability is recognized for the estimated future tax effects attributable to temporary differences between the financial statement basis and the tax basis of assets and liabilities as well as tax credit carry forwards and net operating loss carry forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in the period of the change. The Registrants recognize interest related to unrecognized tax benefits in Interest Expense and recognize penalties in Other Expense in the statements of income. Deferred tax assets are evaluated for future realization and reduced by a valuation allowance to the extent the Registrants believe they will not be realized.

Accrued Vacation

The Registrants accrue vacation pay monthly by establishing a liability for vacation earned. Vacation may be taken as earned and is charged against the liability. At the end of each year, the liability represents the amount of vacation earned but not taken.

Related Party Transactions

OGE Energy charges operating costs to OG&E based on several factors, and operating costs directly related to OG&E are assigned as such. Operating costs incurred for the benefit of OG&E are allocated either as overhead based primarily on labor costs or using the "Distrigas" method, which is a three-factor formula that uses an equal weighting of payroll, net operating revenues and gross property, plant and equipment. OGE Energy adopted this method as a result of a recommendation by the OCC Staff and believes this method provides a reasonable basis for allocating common expenses.

OGE Energy charged operating costs to OG&E of $148.3 million, $135.5 million and $139.3 million during the years ended December 31, 2023, 2022 and 2021, respectively. In 2023 and 2021, OG&E declared $500.0 million and $265.0 million of dividends to OGE Energy, respectively. In 2022, OG&E declared no dividends to OGE Energy.

Accumulated Other Comprehensive Income (Loss)

The following table presents changes in the components of accumulated other comprehensive income (loss) attributable to OGE Energy during 2023 and 2022. All amounts below are presented net of tax.


	Pension Plan and Restoration of Retirement Income Plan						Postretirement Benefit Plans
(In millions)	Net Gain (Loss)			Prior Service Cost (Credit)			Net Gain (Loss)			Prior Service Cost (Credit)			Total
Balance at December 31, 2021	$	(24.9	)	$	(1.2	)	$	1.1		$	0.2		$	(24.8	)
Other comprehensive income (loss) before reclassifications		(7.6	)		—			5.5			—			(2.1	)
Amounts reclassified from accumulated other comprehensive income (loss)		1.4			0.2			—			(0.2	)		1.4
Settlement cost		13.6			—			—			—			13.6
Net current period other comprehensive income (loss)		7.4			0.2			5.5			(0.2	)		12.9
Balance at December 31, 2022		(17.5	)		(1.0	)		6.6			—			(11.9	)
Other comprehensive income (loss) before reclassifications		3.3			—			(0.8	)		—			2.5
Amounts reclassified from accumulated other comprehensive income (loss)		0.9			0.2			(0.1	)		—			1.0
Settlement cost		1.2			—			—			—			1.2
Net current period other comprehensive income (loss)		5.4			0.2			(0.9	)		—			4.7
Balance at December 31, 2023	$	(12.1	)	$	(0.8	)	$	5.7		$	—		$	(7.2	)

The following table presents significant amounts reclassified out of accumulated other comprehensive income (loss) by the respective line items in net income during the years ended December 31, 2023 and 2022.


Details about Accumulated Other Comprehensive Income (Loss) Components	Amount Reclassified from Accumulated Other Comprehensive Income (Loss)						Affected Line Item in OGE Energy's Statements of Income
	Year Ended December 31,
(In millions)	2023			2022
Amortization of Pension Plan and Restoration of Retirement Income Plan items:
Actuarial losses	$	(1.1	)	$	(1.6	)	(A)
Prior service cost		(0.3	)		(0.3	)	(A)
Settlement cost		(1.6	)		(17.9	)	(A)
		(3.0	)		(19.8	)	Income Before Taxes
		(0.7	)		(4.6	)	Income Tax Expense
	$	(2.3	)	$	(15.2	)	Net Income

Amortization of postretirement benefit plans items:
Prior service credit	$	—		$	0.3		(A)
Actuarial gains		0.2			—		(A)
		0.2			0.3		Income Before Taxes
		0.1			0.1		Income Tax Expense
	$	0.1		$	0.2		Net Income

Total reclassifications for the period, net of tax	$	(2.2	)	$	(15.0	)	Net Income

(A)

These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 11 for additional information).

Investment in Unconsolidated Affiliates and Related Party Transactions (Enable)

On December 2, 2021, Energy Transfer completed its acquisition of Enable, and as part of the transaction, Energy Transfer also acquired the general partner interests of Enable from OGE Energy and CenterPoint for cash consideration. OGE Energy accounted for its investment in Enable as an equity method investment until the merger with Energy Transfer closed on December 2, 2021. As a result of the transaction, OGE Energy recorded a pre-tax gain of $344.4 million, which contemplates the December 2, 2021 fair value of the Energy Transfer securities, the December 2, 2021 balance of OGE Energy's equity method investment in Enable, the $35.0 million cash payment received as part of the transaction ($5.0 million from Energy Transfer and $30.0 million from CenterPoint), the accumulated other comprehensive loss impact of OGE Energy's share of Enable's interest rate derivative losses and OGE Energy's transaction costs of $8.6 million. Further discussion of the transaction can be found in OGE Energy's 2021 Form 10-K.

OGE Energy considered distributions received from Enable which did not exceed cumulative equity in earnings subsequent to the date of investment to be a return on investment and were classified as operating activities in the statements of cash flows. Distributions received from Enable were $73.4 million during the year ended December 31, 2021.

In this Form 10-K, Enable activity is included for the relevant portion of OGE Energy's 2021 information presented through December 2, 2021. The below information is provided for prior year context.

The following table presents a reconciliation of OGE Energy's equity in earnings of unconsolidated affiliates for the period of January 1, 2021 through December 2, 2021.


(In millions)
Enable net income used to calculate OGE Energy's equity in earnings	$	470.0
OGE Energy's percent ownership at period end		25.5	%
OGE Energy's portion of Enable net income	$	119.8
Amortization of basis difference and dilution recognition (A)		50.0
Equity in earnings of unconsolidated affiliates	$	169.8

(A)

Includes loss on dilution, net of proportional basis difference recognition.

Related Party Transactions - OGE Energy and Enable

Prior to December 2, 2021, OGE Energy charged operating costs to Enable based on several factors, and operating costs directly related to Enable were assigned as such.

Further, OGE Energy and Enable were parties to several agreements whereby OGE Energy provided specified support services to Enable, such as certain information technology, payroll and benefits administration. Under these agreements, OGE Energy charged operating costs to Enable of $0.3 million for the period of January 1, 2021 through December 2, 2021.

OGE Energy also provided retirement benefits and retiree health care benefits to employees previously seconded to Enable. OGE Energy billed Enable for reimbursement of $12.2 million in 2021 for employment costs under the former seconding agreement. As of a result of the merger between Enable and Energy Transfer, the seconding agreement was terminated, and those employees were no longer employed by OGE Energy. If lump sum payments were made to those employees previously seconded to Enable, OGE Energy would recognize a settlement or curtailment of the pension/retiree health care charges, which would increase expense at OGE Energy by $4.1 million. Settlement and curtailment charges associated with the employees previously seconded to Enable are not reimbursable to OGE Energy.

Related Party Transactions - OG&E and Enable

Enable provided gas transportation services to OG&E pursuant to agreements that granted Enable the responsibility of delivering natural gas to OG&E's generating facilities and performing an imbalance service. Upon the closing of the merger between Enable and Energy Transfer, these contracts were assumed by Energy Transfer. The following table presents summarized related party transactions between OG&E and Enable during the period of January 1, 2021 through December 2, 2021.


(In millions)
Operating revenues:
Electricity to power electric compression assets	$	13.3
Fuel, purchased power and direct transmission expense:
Natural gas transportation services	$	32.7
Natural gas sales	$	(33.5	)

Investment in Equity Securities of Energy Transfer

For the period of December 2, 2021 through September 30, 2022, OGE Energy accounted for its investment in Energy Transfer's equity securities as an equity investment with a readily determinable fair value under ASC 321, "Investments – Equity Securities." As of the end of September 2022, OGE Energy sold all of its 95.4 million Energy Transfer limited partner units, resulting in pre-tax net proceeds of $1,067.2 million. Prior to exiting its Energy Transfer investment, OGE Energy presented the Energy Transfer equity securities at fair value in its balance sheet. OGE Energy presented realized gains and losses of the equity securities, as well as dividend income from the investment, within the Other Income (Expense) section in its 2022 and 2021 statements of income, as appropriate. During the year ended December 31, 2022, OGE Energy recognized a gain of $282.1 million related to its investment in Energy Transfer's equity securities. Due to OGE Energy's sale of all Energy Transfer limited partner units, at December 31, 2022, there was no unrecognized gain or loss related to the investment. For the period between December 2, 2021 and December 31, 2021, OGE Energy had an unrealized loss of $8.6 million related to its investment in Energy Transfer's equity securities. During the year ended December 31, 2022, OGE Energy received distributions of $34.0 million from Energy Transfer, which are presented within Other Income in OGE Energy's 2022 consolidated statements of income.

Reclassifications

Certain prior year amounts have been reclassified to conform to current year presentation. The Registrants changed the classification of removal costs related to long-lived assets in their 2022 and 2021 cash flow statements to conform with current year presentation. The 2022 and 2021 reclassifications of $109.3 million and $83.4 million, respectively, from Regulatory Liabilities in Net Cash Provided from/Used in Operating Activities to Cost of Removal and Other in Net Cash Used in Investing Activities did not impact previously reported Net Change in Cash and Cash Equivalents.

Retirement Plans and Postretirement Benefit Plans - Schedule of Capitalized Pension and Postretirement Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Capitalized Portion of Net Periodic Benefit Cost	$ 2.2	$ 3.0	$ 3.4
Pension Plan [Member] \| Og and E [Member]
Defined Benefit Plan Disclosure [Line Items]
Capitalized Portion of Net Periodic Benefit Cost	1.9	2.5	2.9
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Capitalized Portion of Net Periodic Benefit Cost	0.1	0.2	0.2
Other Postretirement Benefits Plan [Member] \| Og and E [Member]
Defined Benefit Plan Disclosure [Line Items]
Capitalized Portion of Net Periodic Benefit Cost	$ 0.1	$ 0.1	$ 0.1

Schedule II

12 Months Ended

Dec. 31, 2023

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure

SCHEDULE II - Valuation and Qualifying Accounts


			Additions
Description	Balance at Beginning of Period		Charged to Costs and Expenses		Deductions (A)		Balance at End of Period
	(in millions)
Balance at December 31, 2021
Reserve for Uncollectible Accounts	$	2.6	$	3.2	$	3.4	$	2.4
Balance at December 31, 2022
Reserve for Uncollectible Accounts	$	2.4	$	2.8	$	3.3	$	1.9
Balance at December 31, 2023
Reserve for Uncollectible Accounts	$	1.9	$	5.7	$	5.4	$	2.2

(A)

Uncollectible accounts receivable written off, net of recoveries.

Stock-Based Compensation - Fair Value of Vested Performance Units and Restricted Stock (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value of Vested Performance Units and Restricted Stock	$ 9.0	$ 6.2	$ 8.1
Performance Units [Member] \| Og and E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value of Vested Performance Units and Restricted Stock	2.4	1.7	2.3
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value of Vested Performance Units and Restricted Stock	2.4	2.1	2.2
Restricted Stock [Member] \| Og and E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value of Vested Performance Units and Restricted Stock	$ 0.6	$ 0.5	$ 0.5

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Investment in Unconsolidated Affiliate (Tables)

12 Months Ended

Dec. 31, 2023

Equity Method Investments and Joint Ventures [Abstract]

Reconciliation of Equity in Earnings (Losses) of Unconsolidated Affiliates

The following table presents a reconciliation of OGE Energy's equity in earnings of unconsolidated affiliates for the period of January 1, 2021 through December 2, 2021.


(In millions)
Enable net income used to calculate OGE Energy's equity in earnings	$	470.0
OGE Energy's percent ownership at period end		25.5	%
OGE Energy's portion of Enable net income	$	119.8
Amortization of basis difference and dilution recognition (A)		50.0
Equity in earnings of unconsolidated affiliates	$	169.8

(A)

Includes loss on dilution, net of proportional basis difference recognition.

The following table presents summarized related party transactions between OG&E and Enable during the period of January 1, 2021 through December 2, 2021.


(In millions)
Operating revenues:
Electricity to power electric compression assets	$	13.3
Fuel, purchased power and direct transmission expense:
Natural gas transportation services	$	32.7
Natural gas sales	$	(33.5	)

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Income Taxes [Line Items]

Statutory federal tax rate

21.00%

State income taxes, net of federal income tax benefit

(1.30%)

(1.00%)

0.90%

Stock-based compensation

0.10%

0.00%

0.10%

Executive compensation limitation

0.20%

0.10%

Amortization of net unfunded deferred taxes

(7.00%)

(3.20%)

(2.10%)

Federal renewable energy credit

^[1]

0.00%

(2.00%)

Remeasurement of state deferred taxes due to Energy Transfer merger

0.00%

(1.10%)

Remeasurement of state deferred tax liabilities

0.00%

(0.60%)

401(k) dividends

(0.30%)

(0.20%)

Other

(0.80%)

(0.40%)

0.00%

Effective income tax rate

11.90%

15.70%

16.10%

Og and E [Member]

Income Taxes [Line Items]

Statutory federal tax rate

21.00%

State income taxes, net of federal income tax benefit

0.30%

(0.40%)

(1.40%)

Stock-based compensation

0.00%

Executive compensation limitation

0.00%

Amortization of net unfunded deferred taxes

(6.70%)

(5.00%)

(4.60%)

Federal renewable energy credit

^[1]

0.00%

(4.40%)

Remeasurement of state deferred taxes due to Energy Transfer merger

0.00%

Remeasurement of state deferred tax liabilities

0.00%

401(k) dividends

0.00%

Other

(0.70%)

(0.80%)

(0.20%)

Effective income tax rate

13.90%

14.80%

10.40%

[1]	Represents credits primarily associated with the production from OG&E's wind farms.

Report of Business Segments - Summary of OGE Energy's Business Segments (Details) - USD ($) $ in Millions	11 Months Ended	12 Months Ended
	Dec. 02, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating revenues		$ 2,674.3	$ 3,375.7	$ 3,653.7
Fuel, purchased power and direct transmission expense		911.7	1,662.4	2,127.6
Other operation and maintenance		502.6	501.4	463.1
Depreciation and amortization		506.6	460.9	416.0
Taxes other than income		103.2	101.5	102.8
OPERATING INCOME		650.2	649.5	544.2
Equity in earnings of unconsolidated affiliates	$ 169.8	0.0	0.0	169.8
Gain on Enable/Energy Transfer transaction, net		0.0	0.0	344.4
Gain on equity securities		0.0	282.1	(8.6)
Other income (expense)		44.2	24.0	(21.6)
Interest expense		221.4	166.3	158.3
Income tax expense (benefit)		56.2	123.6	141.2
Net income (loss)		416.8	665.7	737.3
Total assets		12,790.7	12,544.7	12,606.4
Capital expenditures		1,178.2	1,050.9	778.5
Operating Segments [Member] \| Electric Company [Member]
Segment Reporting Information [Line Items]
Operating revenues		2,674.3	3,375.7	3,653.7
Fuel, purchased power and direct transmission expense		911.7	1,662.4	2,127.6
Other operation and maintenance		505.0	491.9	464.7
Depreciation and amortization		506.6	460.9	416.0
Taxes other than income		99.4	98.0	99.3
OPERATING INCOME		651.6	662.5	546.1
Equity in earnings of unconsolidated affiliates				0.0
Gain on Enable/Energy Transfer transaction, net				0.0
Gain on equity securities			0.0
Other income (expense)		43.5	11.2	7.7
Interest expense		199.9	157.8	152.0
Income tax expense (benefit)		68.8	76.4	41.8
Net income (loss)		426.4	439.5	360.0
Total assets		12,642.6	12,410.5	11,688.0
Capital expenditures		1,178.2	1,050.9	778.5
Operating Segments [Member] \| Natural Gas Midstream Operations [Member]
Segment Reporting Information [Line Items]
Operating revenues			0.0	0.0
Fuel, purchased power and direct transmission expense			0.0	0.0
Other operation and maintenance			12.6	1.6
Depreciation and amortization			0.0	0.0
Taxes other than income			0.1	0.2
OPERATING INCOME			(12.7)	(1.8)
Equity in earnings of unconsolidated affiliates				169.8
Gain on Enable/Energy Transfer transaction, net				344.4
Gain on equity securities			282.1
Other income (expense)			10.0	(26.4)
Interest expense			0.0	0.0
Income tax expense (benefit)			48.1	101.0
Net income (loss)			231.3	385.0
Total assets			1.2	786.6
Capital expenditures			0.0	0.0
Operating Segments [Member] \| Other Operations [Member]
Segment Reporting Information [Line Items]
Operating revenues		0.0	0.0	0.0
Fuel, purchased power and direct transmission expense		0.0	0.0	0.0
Other operation and maintenance		(2.4)	(3.1)	(3.2)
Depreciation and amortization		0.0	0.0	0.0
Taxes other than income		3.8	3.4	3.3
OPERATING INCOME		(1.4)	(0.3)	(0.1)
Equity in earnings of unconsolidated affiliates				0.0
Gain on Enable/Energy Transfer transaction, net				0.0
Gain on equity securities			0.0
Other income (expense)		8.1	4.9	(2.0)
Interest expense		28.9	10.6	7.2
Income tax expense (benefit)		(12.6)	(0.9)	(1.6)
Net income (loss)		(9.6)	(5.1)	(7.7)
Total assets		301.1	683.7	350.3
Capital expenditures		0.0	0.0	0.0
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues		0.0	0.0	0.0
Fuel, purchased power and direct transmission expense		0.0	0.0	0.0
Other operation and maintenance		0.0	0.0	0.0
Depreciation and amortization		0.0	0.0	0.0
Taxes other than income		0.0	0.0	0.0
OPERATING INCOME		0.0	0.0	0.0
Equity in earnings of unconsolidated affiliates				0.0
Gain on Enable/Energy Transfer transaction, net				0.0
Gain on equity securities			0.0
Other income (expense)		(7.4)	(2.1)	(0.9)
Interest expense		(7.4)	(2.1)	(0.9)
Income tax expense (benefit)		0.0	0.0	0.0
Net income (loss)		0.0	0.0	0.0
Total assets		(153.0)	(550.7)	(218.5)
Capital expenditures		$ 0.0	$ 0.0	$ 0.0

Commitments and Contingencies - Schedule of Wind Purchased Power (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	$ 48.8	$ 58.0	$ 55.8
CPV Keenan [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	23.0	25.8	27.3
Edison Mission Energy [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	20.5	24.9	21.7
NextEra Energy [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	$ 5.3	$ 7.3	$ 6.8

Leases

12 Months Ended

Dec. 31, 2023

Leases [Abstract]

Leases

Based on their evaluation of all contracts under ASC 842, as described in Note 1, the Registrants concluded they have operating lease obligations as described below.

OG&E Railcar Lease Agreement

Effective February 1, 2024, OG&E renewed its February 1, 2019 railcar lease agreement for 770 rotary gondola railcars to transport coal from Wyoming to OG&E's coal-fired generation units. Rental payments are charged to fuel expense and are recoverable through OG&E's fuel adjustment clauses. On February 1, 2029, OG&E has the option to either purchase the railcars at a stipulated fair market value or renew the lease. If OG&E chooses not to purchase the railcars or renew the lease agreement, it would be responsible for the difference between the actual fair value of the railcars and the stipulated fair market value, up to a maximum of $3.2 million.

OG&E holds an additional railcar lease agreement for 135 rotary gondola railcars to transport coal with a term of October 1, 2022 to December 31, 2025.

OG&E Wind Farm Land Lease Agreements

OG&E has operating leases related to land for OG&E's Centennial, OU Spirit and Crossroads wind farms with terms of nine to 13 years remaining, depending on the lease. The Centennial lease has rent escalations which increase annually based on the Consumer Price Index. While lease liabilities are not remeasured as a result of changes to the Consumer Price Index, changes to the Consumer Price Index are treated as variable lease payments and recognized in the period in which the obligation for those payments was incurred. The OU Spirit and Crossroads leases each have rent escalations which increase after five and 10 years. Although the leases are cancellable, OG&E is required to make annual lease payments as long as the wind turbines are located on the land. OG&E does not expect to terminate the leases until the wind turbines reach the end of their useful life.

Financial Statement Information and Maturity Analysis of Lease Liabilities

The following tables present amounts recognized for operating leases in the Registrants' statements of income, statements of cash flows and balance sheets and supplemental information related to those amounts recognized.


	OGE Energy						OG&E
	Year Ended December 31,						Year Ended December 31,
(In millions)	2023		2022		2021		2023		2022		2021
Operating lease cost	$	6.4	$	5.9	$	6.3	$	6.4	$	5.9	$	5.7
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	5.2	$	5.3	$	6.3	$	5.2	$	5.3	$	5.7
Right-of-use assets obtained in exchange for new operating lease liabilities	$	—	$	1.5	$	—	$	—	$	1.5	$	—


	OGE Energy						OG&E
(Dollars in millions)	December 31, 2023			December 31, 2022			December 31, 2023			December 31, 2022
Right-of-use assets at period end (A)	$	25.9		$	30.2		$	25.9		$	30.2
Operating lease liabilities at period end (B)	$	30.5		$	34.8		$	30.5		$	34.8
Operating lease weighted-average remaining lease term (in years)		11.4			11.6			11.4			11.6
Operating lease weighted-average discount rate		4.0	%		4.0	%		4.0	%		4.0	%

(A)

Included in Property, Plant and Equipment in the Registrants' balance sheets.

(B)

Included in Other Deferred Credits and Other Liabilities in the Registrants' balance sheets.

The following table presents a maturity analysis of the Registrants' operating lease liabilities.


Future minimum operating lease payments as of December 31:	OGE Energy		OG&E
(In millions)
2024	$	3.7	$	3.7
2025		3.5		3.5
2026		3.0		3.0
2027		3.0		3.0
2028		3.1		3.1
Thereafter		22.6		22.6
Total future minimum lease payments		38.9		38.9
Less: Imputed interest		8.4		8.4
Present value of net minimum lease payments	$	30.5	$	30.5

Commitments and Contingencies

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

13. Commitments and Contingencies

Purchase Obligations and Commitments

The following table presents the Registrants' future purchase obligations and commitments estimated for the next five years.


(In millions)	2024		2025		2026		2027		2028		Total
Purchase obligations and commitments:
Minimum purchase commitments	$	118.4	$	100.5	$	69.7	$	56.9	$	46.6	$	392.1
Estimated wind power purchase commitments		56.6		56.9		57.3		57.8		58.4		287.0
Capacity commitments		32.4		33.0		40.2		41.4		—		147.0
Long-term service agreement commitments		14.8		16.6		16.6		9.9		3.0		60.9
Generation capacity construction commitments		126.5		137.8		38.3		—		—		302.6
Total purchase obligations and commitments	$	348.7	$	344.8	$	222.1	$	166.0	$	108.0	$	1,189.6

OG&E Minimum Purchase Commitments

OG&E has coal contracts for purchases through December 31, 2025. OG&E may also purchase coal through spot purchases on an as-needed basis. As a participant in the SPP Integrated Marketplace, OG&E purchases its natural gas supply through short-term

agreements. OG&E relies on a combination of natural gas base load agreements and call agreements, whereby OG&E has the right but not the obligation to purchase a defined quantity of natural gas, combined with day and intra-day purchases to meet the demands of the SPP Integrated Marketplace.

OG&E has natural gas transportation service contracts with Energy Transfer, ONEOK, Inc. and Southern Star, which grant these companies the responsibility of delivering natural gas to OG&E's generating facilities. The contracts with Energy Transfer end in December 2024 and December 2038; the contracts with ONEOK, Inc. end in December 2024 and August 2037; and the contract with Southern Star ends in December 2024.

OG&E Estimated Wind Power Purchase Commitments

The following table presents OG&E's wind purchased power contracts.


Company	Location	Original Term of Contract	Expiration of Contract	MWs
CPV Keenan	Woodward County, OK	20 years	2030		152.0
Edison Mission Energy	Dewey County, OK	20 years	2031		130.0
NextEra Energy	Blackwell, OK	20 years	2032		60.0

The following table presents a summary of OG&E's wind power purchases for the years ended December 31, 2023, 2022 and 2021.


Year Ended December 31 (In millions)	2023		2022		2021
CPV Keenan	$	23.0	$	25.8	$	27.3
Edison Mission Energy		20.5		24.9		21.7
NextEra Energy		5.3		7.3		6.8
Total wind power purchased	$	48.8	$	58.0	$	55.8

OG&E Capacity Commitments

In 2022, the SPP approved an increase in the planning reserve margin from 12 percent to 15 percent. Due to near-term generation requirements, in 2023, OG&E entered into short-term power purchase agreements to meet the additional capacity needs in each of the years between 2024 and 2027.

OG&E Long-Term Service Agreement Commitments

OG&E has a long-term parts and service maintenance contract for the upkeep of the McClain Plant. In May 2013, a new contract was signed that is expected to run for the earlier of 128,000 factored-fired hours or 4,800 factored-fired starts. Based on historical usage and current expectations for future usage, this contract is expected to run until 2035. The contract requires payments based on both a fixed and variable cost component, depending on how much the McClain Plant is used.

OG&E has a long-term parts and service maintenance contract for the upkeep of the Redbud Plant. In March 2013, the contract was amended to extend the contract coverage for an additional 24,000 factored-fired hours resulting in a maximum of the earlier of 144,000 factored-fired hours or 4,500 factored-fired starts. Based on historical usage and current expectations for future usage, this contract is expected to run until 2032. The contract requires payments based on both a fixed and variable cost component, depending on how much the Redbud Plant is used.

OG&E Generation Capacity Construction Commitments

OG&E has various generation capacity construction projects, such as plans to install two combustion turbines totaling 448 megawatts at its existing Horseshoe Lake generating facility. The new generating units are expected to be placed into service in late 2026.

Environmental Laws and Regulations

The activities of OG&E are subject to numerous stringent and complex federal, state and local laws and regulations governing environmental protection. These laws and regulations can change, restrict or otherwise impact the Registrants' business activities in many ways, including the handling or disposal of waste material, planning for future construction activities to avoid or mitigate harm to threatened or endangered species and requiring the installation and operation of emissions or pollution control equipment. Failure to comply with these laws and regulations could result in the assessment of administrative, civil and criminal penalties, the imposition of remedial requirements and the issuance of orders enjoining future operations. Management believes that all of the Registrants' operations are in substantial compliance with current federal, state and local environmental standards.

Environmental regulation can increase the cost of planning, design, initial installation and operation of OG&E's facilities. Management continues to evaluate its compliance with existing and proposed environmental legislation and regulations and implement appropriate environmental programs in a competitive market.

Other

In the normal course of business, the Registrants are confronted with issues or events that may result in a contingent liability. These generally relate to lawsuits or claims made by third parties, including governmental agencies. When appropriate, management consults with legal counsel and other experts to assess the claim. If, in management's opinion, the Registrants have incurred a probable loss as set forth by GAAP, an estimate is made of the loss, and the appropriate accounting entries are reflected in the financial statements. If the assessment indicates that a potential loss is not probable but reasonably possible, the nature of the contingent matter, together with an estimate of the range of possible loss, if determinable and material, would be disclosed. At the present time, based on currently available information, the Registrants believe that any reasonably possible losses in excess of accrued amounts arising out of pending or threatened lawsuits or claims would not be quantitatively material to their financial statements and would not have a material adverse effect on their financial position, results of operations or cash flows.

In July 2023, OG&E was named, along with its contractor, as a defendant in a lawsuit filed by an apartment owner and its insurance companies seeking in excess of $60.0 million in damages related to a fire at an apartment building under construction in Oklahoma City. Several additional defendants have also been named. OG&E disputes the claims in the lawsuit and intends to vigorously defend this action. If OG&E was ultimately deemed liable for damages in connection with this incident, OG&E believes its existing insurance policies will cover its costs, in excess of a required retention (the amount of which is not material), to satisfy any liability it may have. Due to the uncertain and preliminary nature of this litigation, the outcome cannot be predicted, and OG&E is unable to provide a range of possible loss in this matter.

Schedule II (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]

Valuation Allowances and Reserves, Beginning Balance

$ 1.9

$ 2.4

$ 2.6

Valuation Allowances and Reserves, Charged to Cost and Expense

5.7

2.8

3.2

SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction

^[1]

5.4

3.3

3.4

Valuation Allowances and Reserves, Ending Balance

$ 2.2

$ 1.9

$ 2.4

[1]	Uncollectible accounts receivable written off, net of recoveries.

Common Equity - Schedule of Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net income attributable to OGE Energy	$ 416.8	$ 665.7	$ 737.3
Basic Average Common Shares Outstanding	200.3	200.2	200.1
Contingently Issuable Shares (Performance and Restricted Stock Units)	0.6	0.6	0.2
Diluted Average Common Shares Outstanding	200.9	200.8	200.3
Basic earnings per average common share	$ 2.08	$ 3.33	$ 3.68
Diluted earnings per average common share	$ 2.07	$ 3.32	$ 3.68
Anti-dilutive shares excluded from earnings per share calculation	0.0	0.0	0.0
Retained Earnings [Member]
Net income attributable to OGE Energy	$ 416.8	$ 665.7	$ 737.3

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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+ Details

Fair Value Measurements - Summary of Financial Instrument Measured at Fair Value On A Recurring Basis and Carrying Amount and Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt	$ 4,340.5	$ 4,548.6
OGE Energy Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt	0.0	499.9
Long-Term Debt, Fair Value	0.0	491.2
OGE Energy Term Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt	49.9	49.8
Long-Term Debt, Fair Value	50.0	50.0
OG&E Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt	4,146.0	3,854.2
Long-Term Debt, Fair Value	3,922.3	3,477.1
OG&E Industrial Authority Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt	135.4	135.4
Long-Term Debt, Fair Value	135.4	135.4
Tinker Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt	9.2	9.3
Long-Term Debt, Fair Value	$ 7.1	$ 7.3

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References + Details

Long-Term Debt

12 Months Ended

Dec. 31, 2023

Long-Term Debt, Unclassified [Abstract]

Long-Term Debt

9. Long-Term Debt

A summary of the Registrants' long-term debt is included in the statements of capitalization. At December 31, 2023, the Registrants were in compliance with all of their debt agreements.

Maturities of OGE Energy's consolidated long-term debt during the next five years consist of $129.4 million in 2025, $181.0 million in 2027 and $500.0 million in 2028. Maturities of OG&E's long-term debt during the next five years consist of $79.4 million in 2025, $181.0 million in 2027 and $500.0 million in 2028. All other long-term debt of the Registrants matures after 2028.

The Registrants have previously incurred costs related to debt refinancing. Unamortized loss on reacquired debt is classified as a Non-Current Regulatory Asset in the balance sheets. Unamortized debt expense and unamortized premium and discount on long-term debt are classified as Long-Term Debt in the balance sheets and are being amortized over the life of the respective debt.

In January 2023, OG&E issued $450.0 million of 5.40 percent Senior Notes due January 15, 2033, and in April 2023, OG&E issued $350.0 million of 5.60 percent Senior Notes due April 1, 2053. The proceeds from these issuances were added to OG&E's general funds to be used for general corporate purposes, including to help fund the repayment of its $500.0 million 0.553 percent Senior Notes that matured on May 26, 2023 and the funding of its capital investment program and working capital needs.

OGE Energy has a $100.0 million floating rate unsecured three-year credit agreement, of which $50.0 million is considered a revolving loan and $50.0 million is considered a term loan. For the year ended December 31, 2023, the interest rate for the $50.0 million drawn on the term loan under this credit agreement ranged from 5.375 percent to 6.375 percent. For additional information related to this credit agreement, see Note 10.

In 2021, OGE Energy issued $500.0 million of 0.703 percent Senior Notes, and OG&E issued $500.0 million of 0.553 percent Senior Notes. The Registrants repaid each of the $500.0 million Senior Notes that matured on May 26, 2023.

OG&E Industrial Authority Bonds

OG&E has tax-exempt pollution control bonds with optional redemption provisions that allow the holders to request repayment of the bonds on any business day. The following table presents information about these bonds, which can be tendered at the option of the holder during the next 12 months.


Series			Date Due	Amount
				(In millions)
1.85%	—	4.75%	Garfield Industrial Authority, January 1, 2025	$	47.0
1.85%	—	4.60%	Muskogee Industrial Authority, January 1, 2025		32.4
1.85%	—	4.75%	Muskogee Industrial Authority, June 1, 2027		56.0
Total (redeemable during next 12 months)				$	135.4

All of these bonds are subject to an optional tender at the request of the holders, at 100 percent of the principal amount, together with accrued and unpaid interest to the date of purchase. The bond holders, on any business day, can request repayment of the bond by delivering an irrevocable notice to the tender agent stating the principal amount of the bond, payment instructions for the purchase price and the business day the bond is to be purchased. The repayment option may only be exercised by the holder of a bond for the principal amount. When a tender notice has been received by the trustee, a third-party remarketing agent for the bonds will attempt to remarket any bonds tendered for purchase. This process occurs once per week. Since the original issuance of these series of bonds in 1995 and 1997, the remarketing agent has successfully remarketed all tendered bonds. If the remarketing agent is unable to remarket any such bonds, OG&E is obligated to repurchase such unremarketed bonds. As OG&E has both the intent and ability to refinance the bonds on a long-term basis and such ability is supported by an ability to consummate the refinancing, the bonds are classified as Long-Term Debt in the balance sheets. OG&E believes that it has sufficient liquidity to meet these obligations.

Stock-Based Compensation - Schedule of Nonvested Share Activity (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum payout range	0.00%
Maximum payout range	200.00%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Accounting Pronouncements

12 Months Ended

Dec. 31, 2023

Accounting Pronouncement [Abstract]

Accounting Pronouncements

2. Accounting Pronouncements

In September 2022, the Financial Accounting Standards Board issued ASU 2022-04, "Liabilities - Supplier Finance Programs (Subtopic 405-50)." The amendments in this update require that a buyer in a supplier finance program disclose in each annual reporting period: (i) the key terms of the program, including a description of the payment terms and assets pledged as security or other forms of guarantees provided for the committed payment to the finance provider and (ii) the amount outstanding that remains unpaid by the buyer as of year-end, a description of where those obligations are presented in the balance sheet and a rollforward of those obligations during the annual period. The standard was effective January 1, 2023, except for the amendment on rollforward information, which was effective January 1, 2024. The Registrants have adopted this standard, which did not result in a material impact on their financial statements and related disclosures.

In November 2023, the Financial Accounting Standards Board issued ASU 2023-07, "Segment Reporting (Topic 280) Improvements to Reportable Segment Disclosures." The amendments in this update improve financial reporting by requiring disclosure of incremental segment information on an annual and interim basis. The standard is effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The Registrants are currently evaluating the impact of adopting this standard on their financial statements.

In December 2023, the Financial Accounting Standards Board issued ASU 2023-09, "Income Taxes (Topic 740) Improvements to Income Tax Disclosures." The amendments in this update require public entities on an annual basis to (i) disclose specific categories in the rate reconciliation and (ii) provide additional information for reconciling items that meet a quantitative threshold. Further, the amendments require entities to disclose on an annual basis income taxes paid (net of refunds received) disaggregated by federal (national), state and foreign taxes and to disaggregate the information by jurisdiction based on a quantitative threshold. The standard is effective January 1, 2025, and early adoption is permitted. The Registrants are currently evaluating the impact of adopting this standard on their financial statements.

The Registrants believe that other recently adopted and recently issued accounting standards that are not yet effective do not appear to have a material impact on the Registrants' financial position, results of operations or cash flows upon adoption.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

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+ Details

Short-Term Debt and Credit Facilities - Schedule of Line of Credit Facilities (Details)
$ in Millions

12 Months Ended

Dec. 31, 2023

USD ($)

Line of Credit Facility [Line Items]

Aggregate Commitment

$ 1,150.0

Line of Credit Outstanding, Amount

$ 499.6

^[1]

Weighted - Average Interest Rate

5.77%

^[2]

OGE Energy [Member]

Line of Credit Facility [Line Items]

Line of Credit Facility, Current Borrowing Capacity

$ 550.0

^[3]

Line of Credit Outstanding, Amount

$ 499.2

^[1],[3]

Weighted - Average Interest Rate

5.78%

^[2],[3]

Maturity

Dec. 18, 2028

^[3],[4]

OGE Energy [Member] | Term Loan [Member]

Line of Credit Facility [Line Items]

Line of Credit Facility, Current Borrowing Capacity

$ 50.0

^[5]

Line of Credit Outstanding, Amount

$ 0.0

^[1],[5]

Weighted - Average Interest Rate

0.00%

^[2],[5]

Maturity

May 24, 2025

^[5]

OG&E [Member]

Line of Credit Facility [Line Items]

Line of Credit Facility, Current Borrowing Capacity

$ 550.0

^[6],[7]

Letters of Credit Outstanding, Amount

$ 0.4

^[1],[6],[7]

Weighted - Average Interest Rate

1.20%

^[2],[6],[7]

Maturity

Dec. 18, 2028

^[4],[6],[7]

[1]	Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at December 31, 2023
[2]	Represents the weighted-average interest rate for the outstanding borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit.
[3]	This bank facility is available to back up OGE Energy's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.
[4]	In December 2022, the Registrants entered into an amendment to their credit facility that gave each of the Registrants the option of extending such commitments for up to two additional one-year periods. On December 18, 2023, the Registrants utilized the first extension option for an additional one-year period extending the term until December 2028.
[5]	OGE Energy has a $100.0 million floating rate unsecured three-year credit agreement, of which $50.0 million is considered a revolving loan and $50.0 million is considered a term loan. The credit agreement, under certain circumstances, may be increased to a maximum commitment limit of $135.0 million and includes a maximum leverage ratio of 0.65 to 1.0. The other covenants under this credit agreement are substantially the same as OGE Energy's existing $550.0 million revolving credit agreement.
[6]	OG&E has an intercompany borrowing agreement with OGE Energy whereby OG&E has access to up to $450.0 million of OGE Energy's revolving credit amount. This agreement has a termination date of December 18, 2028. At December 31, 2023, there was $85.1 million in intercompany borrowings under this agreement.
[7]	This bank facility is available to back up OG&E's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.

Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2023

Long-Term Debt, Unclassified [Abstract]

Schedule of Long-term Debt Instruments


Series			Date Due	Amount
				(In millions)
1.85%	—	4.75%	Garfield Industrial Authority, January 1, 2025	$	47.0
1.85%	—	4.60%	Muskogee Industrial Authority, January 1, 2025		32.4
1.85%	—	4.75%	Muskogee Industrial Authority, June 1, 2027		56.0
Total (redeemable during next 12 months)				$	135.4

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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+ Details

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest costs capitalized	$ 7.1	$ 4.0	$ 3.5
OG&E [Member]
Interest costs capitalized	$ 7.1	$ 4.0	$ 3.5

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 416.8	$ 665.7	$ 737.3
Adjustments to reconcile net income to net cash provided from (used in) operating activities:
Depreciation and amortization	506.6	460.9	416.0
Deferred income taxes and other tax credits, net	11.6	(154.0)	125.9
(Gain) loss on investment in equity securities (Note 1)	0.0	(282.1)	8.6
Gain on Enable/Energy Transfer transaction (Note 1)	0.0	0.0	(353.0)
Equity in earnings of unconsolidated affiliates	0.0	0.0	(169.8)
Distributions from unconsolidated affiliates	0.0	0.0	73.4
Allowance for equity funds used during construction	(19.4)	(6.9)	(6.7)
Stock-based compensation expense	13.1	9.7	9.8
Regulatory assets	(92.1)	702.2	(874.9)
Regulatory liabilities	(12.2)	(9.1)	12.2
Other assets	0.0	18.9	(9.8)
Other liabilities	5.0	(6.6)	(8.1)
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net	42.8	(97.0)	(1.9)
Income taxes receivable	2.5	(18.1)	5.5
Fuel, materials and supplies inventories	(122.8)	(130.1)	(3.4)
Fuel recoveries	535.4	(363.0)	(180.5)
Other current assets	44.6	(30.2)	(22.7)
Accounts payable	(136.3)	155.4	7.5
Other current liabilities	36.7	36.7	4.7
Net cash provided from (used in) operating activities	1,232.3	952.4	(229.9)
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(1,178.2)	(1,050.9)	(778.5)
Proceeds from Sale of Equity Securities, FV-NI	0.0	1,067.2	0.0
Cash received in Enable/Energy Transfer transaction (Note 1)	0.0	0.0	35.0
Cost of removal and other	(93.9)	(112.7)	(89.0)
Net cash used in investing activities	(1,272.1)	(96.4)	(832.5)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt	788.3	49.3	997.8
Payment of long-term debt	(1,000.1)	(0.1)	(0.1)
Increase (decrease) in short-term debt	499.2	(486.9)	391.9
Dividends paid on common stock	(333.2)	(329.3)	(324.9)
Cash paid for employee equity-based compensation and expense of common stock	(2.3)	(0.9)	(3.4)
Net cash (used in) provided from financing activities	(48.1)	(767.9)	1,061.3
NET CHANGE IN CASH AND CASH EQUIVALENTS	(87.9)	88.1	(1.1)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	88.1	0.0	1.1
CASH AND CASH EQUIVALENTS AT END OF YEAR	0.2	88.1	0.0
SUPPLEMENTAL CASH FLOW INFORMATION
Interest (net of interest capitalized)	202.4	164.0	156.4
Income taxes (net of income tax refunds)	41.5	276.0	8.7
NON-CASH INVESTING AND FINANCING ACTIVITIES
Power plant long-term service agreement	0.7	0.8	2.4
Noncash or Part Noncash Acquisition, Investments Acquired	0.0	0.0	793.7
OG&E [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	426.4	439.5	360.0
Adjustments to reconcile net income to net cash provided from (used in) operating activities:
Depreciation and amortization	506.6	460.9	416.0
Deferred income taxes and other tax credits, net	15.4	220.5	44.6
Allowance for equity funds used during construction	(19.4)	(6.9)	(6.7)
Stock-based compensation expense	3.1	2.9	2.2
Regulatory assets	(92.1)	702.2	(874.9)
Regulatory liabilities	(12.2)	(9.1)	12.2
Other assets	4.7	0.0	(2.2)
Other liabilities	0.3	(5.6)	(11.2)
Change in certain current assets and liabilities:
Accounts receivable and accrued unbilled revenues, net	42.1	(96.6)	(3.0)
Fuel, materials and supplies inventories	(122.8)	(130.1)	(3.4)
Fuel recoveries	535.4	(363.0)	(180.5)
Other current assets	51.1	(30.1)	(21.4)
Accounts payable	(131.1)	135.8	(11.0)
Income taxes payable - parent	9.4	8.0	0.7
Other current liabilities	34.6	19.3	3.3
Net cash provided from (used in) operating activities	1,251.5	1,347.7	(275.3)
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(1,178.2)	(1,050.9)	(778.5)
Cost of removal	(91.0)	(109.3)	(83.4)
Net cash used in investing activities	(1,269.2)	(1,160.2)	(861.9)
CASH FLOWS FROM FINANCING ACTIVITIES
Changes In advances with parent	229.2	(187.4)	372.5
Capital contribution from OGE Energy	0.0	0.0	530.0
Proceeds from long-term debt	788.8	0.0	499.8
Payment of long-term debt	(500.1)	(0.1)	(0.1)
Dividends paid on common stock	(500.0)	0.0	(265.0)
Net cash (used in) provided from financing activities	17.9	(187.5)	1,137.2
NET CHANGE IN CASH AND CASH EQUIVALENTS	0.2	0.0	0.0
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	0.0	0.0	0.0
CASH AND CASH EQUIVALENTS AT END OF YEAR	0.2	0.0	0.0
SUPPLEMENTAL CASH FLOW INFORMATION
Interest (net of interest capitalized)	180.7	154.6	148.9
Income taxes (net of income tax refunds)	44.2	(152.6)	(3.2)
NON-CASH INVESTING AND FINANCING ACTIVITIES
Power plant long-term service agreement	$ 0.7	$ 0.8	$ 2.4

Summary of Significant Accounting Policies Property - Summary of Property Plant and Equipment (Parenthetical) (Details) - OG&E [Member] - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Electric Generation Equipment [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Amount of Acquisition Adjustments	$ 148.3	$ 148.3
Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation	83.8	78.3
Electric Transmission [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Amount of Acquisition Adjustments	3.3	3.3
Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation	$ 1.1	$ 1.0

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 416.8	$ 665.7	$ 737.3
Pension Plan and Restoration of Retirement Income Plan:
Amortization of prior service cost, net of tax of $0.1, $0.1 and $0.0, respectively	0.2	0.2	0.1
Amortization of deferred net loss, net of tax of $0.2, $0.2 and $0.9, respectively	0.9	1.4	1.6
Net gain (loss) arising during the period, net of tax of $1.0, ($2.4) and $0.0, respectively	3.3	(7.6)	1.4
Prior service cost arising during the period, net of tax of $0.0, $0.0 and ($0.3), respectively	0.0	0.0	(1.1)
Settlement cost, net of tax of $0.4, $4.3 and $2.7, respectively	1.2	13.6	6.0
Postretirement benefit plans:
Amortization of prior service credit, net of tax of $0.0, ($0.1) and ($0.4), respectively	0.0	(0.2)	(1.4)
Amortization of deferred net (gain) loss, net of tax of ($0.1), $0.0 and $0.0, respectively	(0.1)	0.0	0.1
Net gain (loss) arising during the period, net of tax of ($0.2), $1.7 and ($0.2), respectively	(0.8)	5.5	(0.7)
Other comprehensive gain from unconsolidated affiliates, net of tax $0.0, $0.0 and $0.3, respectively	0.0	0.0	1.3
Other comprehensive income, net of tax	4.7	12.9	7.3
Comprehensive income	$ 421.5	$ 678.6	$ 744.6

Pay vs Performance Disclosure - USD ($) $ in Millions	12 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net Income (Loss)	$ 416.8	$ 665.7	$ 737.3

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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+ Details

Income Taxes

12 Months Ended

Dec. 31, 2023

Income Taxes [Abstract]

Income Taxes

7. Income Taxes

Income Tax Expense (Benefit)

The following table presents the components of income tax expense (benefit).


	OGE Energy									OG&E
Year Ended December 31 (In millions)	2023			2022			2021			2023			2022			2021
Provision (benefit) for current income taxes:
Federal	$	46.1		$	250.8		$	16.4		$	48.9		$	(141.2	)	$	(9.0	)
State		(2.2	)		28.8			1.7			3.7			(0.9	)		9.0
Total provision (benefit) for current income taxes		43.9			279.6			18.1			52.6			(142.1	)		—
Provision (benefit) for deferred income taxes, net:
Federal		18.1			(110.8	)		133.1			18.8			219.9			58.3
State		(5.8	)		(45.2	)		(10.0	)		(2.6	)		(1.4	)		(16.5	)
Total provision (benefit) for deferred income taxes, net		12.3			(156.0	)		123.1			16.2			218.5			41.8
Total income tax expense	$	56.2		$	123.6		$	141.2		$	68.8		$	76.4		$	41.8

OGE Energy files consolidated income tax returns in the U.S. federal jurisdiction and various state jurisdictions. OG&E is a part of the consolidated income tax return of OGE Energy. With few exceptions, the Registrants are no longer subject to U.S. federal tax or state and local examinations by tax authorities for years prior to 2020. Income taxes are generally allocated to each company in the affiliated group, including OG&E, based on its stand-alone taxable income or loss. Federal investment tax credits previously claimed on electric company property have been deferred and will be amortized to income over the life of the related property. Oklahoma investment tax credits are also earned on investments in electric generating facilities which further reduce OG&E's effective tax rate.

The following table presents a reconciliation of the statutory tax rates to the effective income tax rate.


	OGE Energy									OG&E
Year Ended December 31	2023			2022			2021			2023			2022			2021
Statutory federal tax rate		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%
State income taxes, net of federal income tax benefit		(1.3	)		(1.0	)		0.9			0.3			(0.4	)		(1.4	)
Stock-based compensation		0.1			—			0.1			—			—			—
Executive compensation limitation		0.2			0.1			0.1			—			—			—
Amortization of net unfunded deferred taxes		(7.0	)		(3.2	)		(2.1	)		(6.7	)		(5.0	)		(4.6	)
Federal renewable energy credit (A)		—			—			(2.0	)		—			—			(4.4	)
Remeasurement of state deferred taxes due to Energy Transfer merger		—			—			(1.1	)		—			—			—
Remeasurement of state deferred tax liabilities		—			(0.6	)		(0.6	)		—			—			—
401(k) dividends		(0.3	)		(0.2	)		(0.2	)		—			—			—
Other		(0.8	)		(0.4	)		—			(0.7	)		(0.8	)		(0.2	)
Effective income tax rate		11.9	%		15.7	%		16.1	%		13.9	%		14.8	%		10.4	%

(A)

Represents credits primarily associated with the production from OG&E's wind farms.

The deferred tax provisions are recognized as costs in the ratemaking process by the commissions having jurisdiction over the rates charged by OG&E. The following table presents the components of Deferred Income Taxes at December 31, 2023 and 2022.


	OGE Energy						OG&E
December 31 (In millions)	2023			2022			2023			2022
Deferred income tax liabilities, net:
Accelerated depreciation and other property related differences	$	1,753.8		$	1,714.5		$	1,753.8		$	1,714.5
Regulatory assets		67.6			54.8			67.6			54.7
Pension Plan		21.8			18.0			37.9			35.4
Corporate owned life insurance		2.6			2.4			—			—
Bond redemption-unamortized costs		1.4			1.6			1.4			1.6
Income taxes recoverable from customers, net		(202.7	)		(216.7	)		(202.7	)		(216.7	)
State tax credits		(228.8	)		(221.2	)		(213.5	)		(208.5	)
Regulatory liabilities		(54.4	)		(60.8	)		(54.4	)		(60.8	)
Asset retirement obligations		(19.7	)		(18.8	)		(19.7	)		(18.8	)
Postretirement medical and life insurance benefits		(20.8	)		(19.2	)		(14.0	)		(12.7	)
Accrued liabilities		(13.2	)		(11.2	)		(5.5	)		(7.3	)
Deferred federal investment tax credits		(2.7	)		(2.9	)		(2.7	)		(2.9	)
Accrued vacation		(1.4	)		(1.4	)		(1.4	)		(1.1	)
Uncollectible accounts		(0.5	)		(0.5	)		(0.4	)		(0.5	)
Other		(2.2	)		(5.1	)		(5.6	)		(5.8	)
Total deferred income tax liabilities, net	$	1,300.8		$	1,233.5		$	1,340.8		$	1,271.1

As of December 31, 2023, the Registrants have classified $14.7 million of unrecognized tax benefits as a reduction of deferred tax assets recorded. Management is currently unaware of any issues under review that could result in significant additional payments, accruals or other material deviation from this amount.

The following table presents a reconciliation of the Registrants' total gross unrecognized tax benefits as of the years ended December 31, 2023, 2022 and 2021.


(In millions)	2023		2022			2021
Balance at January 1	$	20.7	$	22.4		$	21.9
Tax positions related to current year:
Additions		7.9		—			1.7
Reductions		—		(1.7	)		(1.2	)
Balance at December 31	$	28.6	$	20.7		$	22.4

The Registrants recognize tax benefits from an uncertain tax position only if it is more likely than not the tax position will be sustained on examination by taxing authorities based on the technical merits of the position. The tax benefits in the financial statements from such positions are then measured based on the largest benefit that has a greater than 50 percent likelihood of being realized on settlement. In 2023, the Registrants recorded a $7.9 million reserve related to a state tax position taken associated with the sale of Energy Transfer units.

Where applicable, the Registrants classify income tax-related interest and penalties as interest expense and other expense, respectively. During the years ended December 31, 2023, 2022 and 2021, there were no income tax-related interest or penalties recorded with regard to uncertain tax positions.

As of December 31, 2023, 2022 and 2021, there were $22.6 million, $16.4 million and $18.1 million, respectively, of unrecognized tax benefits that, if recognized, would affect the annual effective tax rate.

The following table presents a summary of the Registrants' tax credits carried forward as deferred tax assets. Under current law, the Registrants expect future taxable income will be sufficient to utilize all credits before they begin to expire after 2028.


	OGE Energy				OG&E
(In millions)	Carry Forward Amount		Deferred Tax Asset		Carry Forward Amount		Deferred Tax Asset		Earliest Expiration Date
State tax credits:
Oklahoma investment tax credits	$	259.1	$	204.7	$	239.8	$	189.4	N/A
Oklahoma capital investment board credits	$	12.8	$	12.8	$	12.8	$	12.8	N/A
Oklahoma zero emission tax credits	$	16.0	$	11.3	$	16.0	$	11.3	2028

N/A - not applicable

In connection with its investment in Energy Transfer during 2022, OGE Energy anticipated operating losses in various state jurisdictions. As discussed in Note 1, OGE Energy has fully disposed of its investment in Energy Transfer, and it does not expect future taxable income in these states. Therefore, as of December 31, 2022, OGE Energy recorded a valuation allowance of $2.7 million, which eliminated the related deferred tax asset balance. During 2023, OGE Energy received final information which resulted in taxable income instead of operating losses for tax year 2022. The valuation allowance originally recorded in 2022 was eliminated when the final 2022 tax returns were filed in 2023.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//740/tableOfContent

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-14

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-21

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 270
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482526/740-270-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 17
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-17

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.5.Q1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482603/740-30-50-2

+ Details

Fair Value Measurements - Additional Information (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial instruments measured at fair value	$ 0	$ 0

Commitments and Contingencies - Unrecorded Unconditional Purchase Obligations Disclosure (Details) $ in Millions	Dec. 31, 2023 USD ($)
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months	$ 348.7
Unrecorded Unconditional Purchase Obligation, Due within Two Years	344.8
Unrecorded Unconditional Purchase Obligation, Due within Three Years	222.1
Unrecorded Unconditional Purchase Obligation, Due within Four Years	166.0
Unrecorded Unconditional Purchase Obligation, Due within Five Years	108.0
Unrecorded Unconditional Purchase Obligation, Total	1,189.6
OG&E minimum fuel purchase commitments [Member]
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months	118.4
Unrecorded Unconditional Purchase Obligation, Due within Two Years	100.5
Unrecorded Unconditional Purchase Obligation, Due within Three Years	69.7
Unrecorded Unconditional Purchase Obligation, Due within Four Years	56.9
Unrecorded Unconditional Purchase Obligation, Due within Five Years	46.6
Unrecorded Unconditional Purchase Obligation, Total	392.1
OG&E Estimated Wind Purchase Commitments [Member]
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months	56.6
Unrecorded Unconditional Purchase Obligation, Due within Two Years	56.9
Unrecorded Unconditional Purchase Obligation, Due within Three Years	57.3
Unrecorded Unconditional Purchase Obligation, Due within Four Years	57.8
Unrecorded Unconditional Purchase Obligation, Due within Five Years	58.4
Unrecorded Unconditional Purchase Obligation, Total	287.0
OG&E Capacity Commitments [Member]
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months	32.4
Unrecorded Unconditional Purchase Obligation, Due within Two Years	33.0
Unrecorded Unconditional Purchase Obligation, Due within Three Years	40.2
Unrecorded Unconditional Purchase Obligation, Due within Four Years	41.4
Unrecorded Unconditional Purchase Obligation, Due within Five Years	0.0
Unrecorded Unconditional Purchase Obligation, Total	147.0
OG&E long-term service agreement commitments [Member]
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months	14.8
Unrecorded Unconditional Purchase Obligation, Due within Two Years	16.6
Unrecorded Unconditional Purchase Obligation, Due within Three Years	16.6
Unrecorded Unconditional Purchase Obligation, Due within Four Years	9.9
Unrecorded Unconditional Purchase Obligation, Due within Five Years	3.0
Unrecorded Unconditional Purchase Obligation, Total	60.9
OG&E Generation Capacity Construction Commitments [Member]
Loss Contingencies [Line Items]
Purchase Obligation, Due in Next Twelve Months	126.5
Unrecorded Unconditional Purchase Obligation, Due within Two Years	137.8
Unrecorded Unconditional Purchase Obligation, Due within Three Years	38.3
Unrecorded Unconditional Purchase Obligation, Due within Four Years	0.0
Unrecorded Unconditional Purchase Obligation, Due within Five Years	0.0
Unrecorded Unconditional Purchase Obligation, Total	$ 302.6

Document and Entity Information Document - USD ($)	12 Months Ended
Document and Entity Information Document - USD ($)	Dec. 31, 2023	Jan. 31, 2024	Jun. 30, 2023
Entity Information [Line Items]
Entity Registrant Name	OGE ENERGY CORP.
Entity Central Index Key	0001021635
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Period End Date	Dec. 31, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Incorporation, State or Country Code	OK
Entity Tax Identification Number	73-1481638
Entity Address, Address Line One	321 North Harvey
Entity Address, Address Line Two	P.O. Box 321
Trading Symbol	OGE
Security Exchange Name	NYSE
Entity Interactive Data Current	Yes
City Area Code	405
Local Phone Number	553-3000
Entity Address, State or Province	OK
Entity Address, Postal Zip Code	73101-0321
Entity File Number	1-12579
Title of 12(b) Security	Common Stock
Entity Address, City or Town	Oklahoma City
Share Price			$ 35.91
Document Transition Report	false
Document Annual Report	true
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Document Type	10-K
Entity Common Stock, Shares Outstanding		200,330,340	200,287,364
Entity Public Float			$ 7,192,319,241
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE The Proxy Statement for OGE Energy Corp.'s 2024 annual meeting of shareowners is incorporated by reference into Part III of this Form 10-K. This combined Form 10-K represents separate filings by OGE Energy Corp. and Oklahoma Gas and Electric Company. Information contained herein related to an individual registrant is filed by such registrant on its own behalf. Oklahoma Gas and Electric Company makes no representations as to the information relating to OGE Energy Corp.'s other operations. Oklahoma Gas and Electric Company meets the conditions set forth in General Instruction I(1)(a) and (b) of Form 10-K and is therefore filing this form with the reduced disclosure format permitted by General Instruction I(2).
Auditor Name	Ernst & Young LLP
Auditor Firm ID	42
Auditor Location	Oklahoma City, Oklahoma
OG&E [Member]
Entity Information [Line Items]
Entity Registrant Name	OKLAHOMA GAS AND ELECTRIC COMPANY
Entity Central Index Key	0000074145
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Tax Identification Number	73-0382390
Entity Interactive Data Current	Yes
Entity File Number	1-1097
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Common Stock, Shares Outstanding		40,378,745
Auditor Name	Ernst & Young LLP
Auditor Firm ID	42
Auditor Location	Oklahoma City, Oklahoma

Retirement Plans and Postretirement Benefit Plans - Schedule of Expected Benefit Payments (Details) $ in Millions	Dec. 31, 2023 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected Future Benefit Payments, Next Twelve Months	$ 44.4
Expected Future Benefit Payments, Year Two	28.1
Expected Future Benefit Payments, Year Three	27.9
Expected Future Benefit Payments, Year Four	34.2
Expected Future Benefit Payments, Year Five	28.0
Expected Future Benefit Payments, Five Fiscal Years Thereafter	122.7
Og and E [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected Future Benefit Payments, Next Twelve Months	35.4
Expected Future Benefit Payments, Year Two	22.2
Expected Future Benefit Payments, Year Three	22.4
Expected Future Benefit Payments, Year Four	21.1
Expected Future Benefit Payments, Year Five	21.0
Expected Future Benefit Payments, Five Fiscal Years Thereafter	$ 96.3

Leases - Additional Information (Details)	Dec. 31, 2023 USD ($)
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Contingent Liability	$ 3,200,000
Minimum [Member] \| OG&E Wind Farm Land Lease Agreements [Member]
Operating Leased Assets [Line Items]
Operating lease, term of contract	9 years
Maximum [Member] \| OG&E Wind Farm Land Lease Agreements [Member]
Operating Leased Assets [Line Items]
Operating lease, term of contract	13 years

Stock Based Compensation - Additional Information (Details) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock-Based Compensation [Abstract]
Number of Shares Authorized	8,417,755
Number of treasury stock used	2,371		154,523
New common stock shares issued	82,321	27,278

Retirement Plans and Postretirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2023

Retirement Plans and Postretirement Benefit Plans [Abstract]

Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets

The details of the funded status of OGE Energy's Pension Plan, the Restoration of Retirement Income Plan and the postretirement benefit plans and the amounts included in the balance sheets for 2023 and 2022 are included in the following tables. These amounts have been recorded in Accrued Benefit Obligations with the offset in Accumulated Other Comprehensive Loss (except OG&E's portion, which is recorded as a regulatory asset as discussed in Note 1) in the balance sheets. The amounts in Accumulated Other Comprehensive Loss and those recorded as a regulatory asset represent a net periodic benefit cost to be recognized in the statements of income in future periods. The benefit obligation for OGE Energy's Pension Plan and the Restoration of Retirement Income Plan represents the projected benefit obligation, while the benefit obligation for the postretirement benefit plans represents the accumulated postretirement benefit obligation. The accumulated postretirement benefit obligation for OGE Energy's Pension Plan and Restoration of Retirement Income Plan differs from the projected benefit obligation in that the former includes no assumption about future compensation levels.


	OGE Energy												OG&E
	Pension Plan						Restoration of Retirement Income Plan						Pension Plan						Restoration of Retirement Income Plan
December 31 (In millions)	2023			2022			2023			2022			2023			2022			2023			2022
Change in benefit obligation
Beginning obligations	$	358.5		$	502.9		$	5.8		$	5.9		$	288.5		$	363.2		$	0.5		$	0.5
Service cost		5.4			7.6			1.0			1.1			4.4			6.2			—			—
Interest cost		15.9			15.7			0.3			0.2			12.6			12.1			—			—
Plan settlements		(62.8	)		(95.8	)		(1.4	)		(1.5	)		(57.7	)		(38.8	)		(0.7	)		—
Actuarial losses (gains)		0.8			(56.9	)		(0.2	)		0.1			2.7			(41.3	)		0.2			—
Benefits paid		(14.1	)		(15.0	)		—			—			(11.9	)		(12.9	)		—			—
Ending obligations	$	303.7		$	358.5		$	5.5		$	5.8		$	238.6		$	288.5		$	—		$	0.5

Change in plans' assets
Beginning fair value	$	293.0		$	486.0		$	—		$	—		$	238.9		$	353.0		$	—		$	—
Actual return on plans' assets		27.6			(82.2	)		—			—			22.1			(62.4	)		—			—
Employer contributions		—			—			1.4			0.2			—			—			0.7			—
Plan settlements		(62.8	)		(95.8	)		(1.4	)		(0.2	)		(57.7	)		(38.8	)		(0.7	)		—
Benefits paid		(14.1	)		(15.0	)		—			—			(11.9	)		(12.9	)		—			—
Ending fair value	$	243.7		$	293.0		$	—		$	—		$	191.4		$	238.9		$	—		$	—
Funded status at end of year	$	(60.0	)	$	(65.5	)	$	(5.5	)	$	(5.8	)	$	(47.2	)	$	(49.6	)	$	—		$	(0.5	)
Accumulated postretirement benefit obligation	$	289.5		$	342.7		$	4.9		$	4.8		$	226.5		$	275.2		$	—		$	0.4

For the year ended December 31, 2023, actuarial losses were primarily due to more lump sum payouts than expected, partially offset by demographic experience. For the year ended December 31, 2022, Pension Plan actuarial gains were primarily due to significantly higher discount rates, partially offset by demographic experience and a larger than expected amount of early 2023 lump sum payouts.


	OGE Energy						OG&E
	Postretirement Benefit Plans						Postretirement Benefit Plans
December 31 (In millions)	2023			2022			2023			2022
Change in benefit obligation
Beginning obligations	$	101.9		$	137.3		$	76.4		$	102.4
Service cost		0.1			0.2			0.1			0.1
Interest cost		5.2			3.5			3.9			2.7
Participants' contributions		3.4			3.5			2.4			2.4
Actuarial losses (gains)		4.9			(29.1	)		4.0			(21.0	)
Benefits paid		(12.2	)		(13.5	)		(9.5	)		(10.2	)
Ending obligations	$	103.3		$	101.9		$	77.3		$	76.4

Change in plans' assets
Beginning fair value	$	32.8		$	44.3		$	29.8		$	39.9
Actual return on plans' assets		1.9			(8.2	)		1.7			(7.4	)
Employer contributions		6.8			6.7			5.2			5.1
Participants' contributions		3.4			3.5			2.4			2.4
Benefits paid		(12.2	)		(13.5	)		(9.5	)		(10.2	)
Ending fair value	$	32.7		$	32.8		$	29.6		$	29.8
Funded status at end of year	$	(70.6	)	$	(69.1	)	$	(47.7	)	$	(46.6	)

Schedule of Defined Benefit Plans Disclosures

The following tables present the net periodic benefit cost components, before consideration of capitalized amounts, of OGE Energy's Pension Plan, Restoration of Retirement Income Plan and postretirement benefit plans that are included in the financial statements. Service cost is presented within Other Operation and Maintenance Expense, and the remaining net periodic benefit cost components as listed in the following tables are presented within Other Net Periodic Benefit Income (Expense) in the statements of income. OG&E recovers specific amounts of pension and postretirement medical costs in rates approved in its Oklahoma rate reviews. In accordance with approved orders, OG&E defers the difference between actual pension and postretirement medical expenses and the amount approved in its last Oklahoma rate review as a regulatory asset or regulatory liability. These amounts have been recorded in the Pension tracker in the regulatory assets and liabilities table in Note 1 and within Other Net Periodic Benefit Income (Expense) in the statements of income.


OGE Energy	Pension Plan									Restoration of Retirement Income Plan
Year Ended December 31 (In millions)	2023			2022			2021			2023		2022		2021
Service cost	$	5.4		$	7.6		$	11.2		$	1.0	$	1.1	$	0.8
Interest cost		15.9			15.7			13.3			0.3		0.2		0.1
Expected return on plan assets		(16.2	)		(25.4	)		(34.1	)		—		—		—
Amortization of net loss		8.0			8.9			9.4			—		0.2		0.2
Amortization of unrecognized prior service cost (A)		—			—			—			0.3		0.2		0.1
Settlement cost		21.8			30.6			41.3			0.5		0.3		2.1
Total net periodic benefit cost		34.9			37.4			41.1			2.1		2.0		3.3
Less: Amount paid by unconsolidated affiliates		—			—			(0.2	)		—		—		0.1
Net periodic benefit cost	$	34.9		$	37.4		$	41.3		$	2.1	$	2.0	$	3.2

(A)

Unamortized prior service cost is amortized on a straight-line basis over the average remaining service period to the first eligibility age of participants who are expected to receive a benefit and are active at the date of the plan amendment.


OG&E	Pension Plan									Restoration of Retirement Income Plan
Year Ended December 31 (In millions)	2023			2022			2021			2023		2022		2021
Service cost	$	4.4		$	6.2		$	7.7		$	—	$	—	$	—
Interest cost		12.6			12.1			9.7			—		—		—
Expected return on plan assets		(12.9	)		(19.6	)		(24.7	)		—		—		—
Amortization of net loss		6.9			7.4			7.0			—		—		0.1
Settlement cost		20.4			12.9			33.1			0.4		—		1.6
Total net periodic benefit cost		31.4			19.0			32.8			0.4		—		1.7
Plus: Amount allocated from OGE Energy		3.0			5.2			6.5			1.7		1.5		1.5
Net periodic benefit cost	$	34.4		$	24.2		$	39.3		$	2.1	$	1.5	$	3.2

In addition to the net periodic benefit cost amounts recognized, as presented in the table above, for the Pension and Restoration of Retirement Income Plans in 2023, 2022 and 2021, the Registrants recognized the following:


Year Ended December 31 (In millions)	2023		2022		2021
Change in pension expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A)	$	33.3	$	15.2	$	23.0
Deferral of pension expense related to pension settlement charges included in the above line item:
Oklahoma jurisdiction (A)	$	20.1	$	15.4	$	37.9
Arkansas jurisdiction (A)	$	1.9	$	1.4	$	3.5

(A)

Included in the pension regulatory asset in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.


	OGE Energy									OG&E
	Postretirement Benefit Plans									Postretirement Benefit Plans
Year Ended December 31 (In millions)	2023			2022			2021			2023			2022			2021
Service cost	$	0.1		$	0.2		$	0.2		$	0.1		$	0.1		$	0.1
Interest cost		5.2			3.5			3.4			3.9			2.7			2.6
Expected return on plan assets		(1.7	)		(1.8	)		(1.8	)		(1.6	)		(1.6	)		(1.7	)
Amortization of net loss		(0.2	)		1.5			2.8			—			1.5			2.7
Amortization of unrecognized prior service cost (A)		—			(3.8	)		(6.9	)		—			(3.6	)		(5.0	)
Total net periodic benefit cost (income)		3.4			(0.4	)		(2.3	)		2.4			(0.9	)		(1.3	)
Less: Amount paid by unconsolidated affiliates (B)		—			—			(0.5	)
Plus: Amount allocated from OGE Energy (B)											0.5			—			(0.5	)
Net periodic benefit cost (income)	$	3.4		$	(0.4	)	$	(1.8	)	$	2.9		$	(0.9	)	$	(1.8	)

(A)

(B)

"Amount paid by unconsolidated affiliates" is only applicable to OGE Energy. "Amount allocated from OGE Energy" is only applicable to OG&E.

In addition to the net periodic benefit cost or income amounts recognized, as presented in the table above, for the postretirement benefit plans in 2023, 2022 and 2021, the Registrants recognized the following:


Year Ended December 31 (In millions)	2023		2022		2021
Change in postretirement expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A)	$	4.4	$	0.6	$	(0.4	)

(A)

Included in the pension regulatory asset, as indicated in the regulatory assets and liabilities table in Note 1.

Schedule of Capitalized Pension and Postretirement Cost

The following table presents the amount of net periodic benefit cost capitalized and attributable to each of the Registrants for OGE Energy's Pension Plan and postretirement benefit plans in 2023, 2022 and 2021.


	OGE Energy						OG&E
(In millions)	2023		2022		2021		2023		2022		2021
Capitalized portion of net periodic pension benefit cost	$	2.2	$	3.0	$	3.4	$	1.9	$	2.5	$	2.9
Capitalized portion of net periodic postretirement benefit cost	$	0.1	$	0.2	$	0.2	$	0.1	$	0.1	$	0.1

Schedule of Assumptions Used

Rate Assumptions


	Pension Plan and Restoration of Retirement Income Plan									Postretirement Benefit Plans
Year Ended December 31	2023			2022			2021			2023			2022			2021
Assumptions to determine benefit obligations:
Discount rate		5.40	%		5.45	%		2.75	%		5.35	%		5.40	%		2.80	%
Rate of compensation increase		4.20	%		4.20	%		4.20	%	N/A			N/A			N/A
Interest crediting rate		3.50	%		3.50	%		3.50	%	N/A			N/A			N/A
Assumptions to determine net periodic benefit cost:
Discount rate		5.45	%		4.01	%		2.63	%		5.40	%		2.80	%		2.45	%
Expected return on plan assets		7.00	%		7.00	%		7.00	%		4.00	%		4.00	%		4.00	%
Rate of compensation increase		4.20	%		4.20	%		4.20	%	N/A			N/A			N/A
Interest crediting rate		3.50	%		3.50	%		3.50	%	N/A			N/A			N/A

N/A - not applicable

Projected Benefit Obligation Funded Status Thresholds

The Pension Plan assets are held in a trust which follows an investment policy and strategy designed to reduce the funded status volatility of the Plan by utilizing liability driven investing. The purpose of liability-driven investing is to structure the asset portfolio to more closely resemble the pension liability and thereby more effectively hedge against changes in the liability. The investment policy follows a glide path approach that shifts a higher portfolio weighting to fixed income as the Plan's funded status increases. The following table presents the targeted fixed income and equity allocations at different funded status levels.


Projected Benefit Obligation Funded Status Thresholds	<90%	95%	100%	105%	110%	115%	120%
Fixed income	50%	58%	65%	73%	80%	85%	90%
Equity	50%	42%	35%	27%	20%	15%	10%
Total	100%	100%	100%	100%	100%	100%	100%

Pension Plan Equity Asset Allocation Table

Within the portfolio's overall allocation to equities, the funds are allocated according to the guidelines in the following table.


Asset Class	Target Allocation	Minimum	Maximum
Domestic Large Cap Equity	40%	35%	60%
Domestic Mid-Cap Equity	15%	5%	25%
Domestic Small-Cap Equity	25%	5%	30%
International Equity	20%	10%	30%

Schedule of Allocation of Plan Assets

The following tables present the postretirement benefit plans' investments that are measured at fair value on a recurring basis at December 31, 2023 and 2022. There were no Level 2 investments held by the postretirement benefit plans at December 31, 2023 and 2022.


(In millions)	December 31, 2023			Level 1		Level 3
Group retiree medical insurance contract	$	16.8		$	—	$	16.8
Mutual funds		15.9			15.9		—
Total OGE Energy plan investments	$	32.7		$	15.9	$	16.8
Plan investments attributable to affiliates		(3.1	)
Total OG&E plan investments	$	29.6


(In millions)	December 31, 2022			Level 1		Level 3
Group retiree medical insurance contract	$	21.6		$	—	$	21.6
Mutual funds		11.2			11.2		—
Total OGE Energy plan investments	$	32.8		$	11.2	$	21.6
Plan investments attributable to affiliates		(3.0	)
Total OG&E plan investments	$	29.8

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets

The following table presents a reconciliation of the postretirement benefit plans' investments that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3).


Year Ended December 31 (In millions)	2023
Group retiree medical insurance contract:
Beginning balance	$	21.6
Claims paid		(4.5	)
Realized losses		(0.9	)
Investment fees		(0.1	)
Interest income		0.7
Ending balance	$	16.8

Schedule of Expected Benefit Payments

The following table presents the benefit payments the Registrants expect to pay related to the Pension Plan and Restoration of Retirement Income Plan. These expected benefits are based on the same assumptions used to measure OGE Energy's benefit obligation at the end of the year and include benefits attributable to estimated future employee service.


(In millions)	OGE Energy		OG&E
2024	$	44.4	$	35.4
2025	$	28.1	$	22.2
2026	$	27.9	$	22.4
2027	$	34.2	$	21.1
2028	$	28.0	$	21.0
2029-2033	$	122.7	$	96.3

The Medicare Prescription Drug, Improvement and Modernization Act of 2003 expanded coverage for prescription drugs. The following table presents the gross benefit payments the Registrants expect to pay related to the postretirement benefit plans, including prescription drug benefits.


(In millions)	OGE Energy		OG&E
2024	$	13.9	$	10.5
2025	$	11.5	$	8.6
2026	$	10.9	$	8.0
2027	$	9.9	$	7.4
2028	$	9.0	$	6.8
2029-2033	$	36.9	$	27.8

Defined Benefit Plan, Plan Assets, Category

The following tables present the Pension Plan's investments that are measured at fair value on a recurring basis at December 31, 2023 and 2022. There were no Level 3 investments held by the Pension Plan at December 31, 2023 and 2022.


(In millions)	December 31, 2023			Level 1		Level 2		Net Asset Value (A)
Common stocks	$	56.9		$	56.9	$	—	$	—
U.S. Treasury notes and bonds (B)		42.4			42.4		—		—
Mortgage- and asset-backed securities		22.0			—		22.0		—
Corporate fixed income and other securities		54.6			—		54.6		—
Commingled fund (C)		13.8			—		—		13.8
Foreign government bonds		0.2			—		0.2		—
U.S. municipal bonds		0.3			—		0.3		—
Money market fund		1.3			—		—		1.3
Mutual funds		55.3			55.3		—		—
Preferred stocks		1.0			1.0		—		—
U.S. Treasury futures:
Cash collateral		0.3			0.3		—		—
Forward contracts:
Receivable (foreign currency)		0.1			—		0.1		—
Total Pension Plan investments		248.2		$	155.9	$	77.2	$	15.1
Interest and dividends receivable		1.4
Receivable from broker for securities sold		8.3
Payable to broker for securities purchased		(14.2	)
Total OGE Energy Pension Plan assets	$	243.7
Pension Plan investments attributable to affiliates		(52.3	)
Total OG&E Pension Plan assets	$	191.4


(In millions)	December 31, 2022			Level 1		Level 2		Net Asset Value (A)
Common stocks	$	71.9		$	71.9	$	—	$	—
U.S. Treasury notes and bonds (B)		44.6			44.6		—		—
Mortgage- and asset-backed securities		26.2			—		26.2		—
Corporate fixed income and other securities		65.5			—		65.5		—
Commingled fund (C)		18.2			—		—		18.2
Foreign government bonds		0.5			—		0.5		—
U.S. municipal bonds		0.9			—		0.9		—
Money market fund		5.9			—		—		5.9
Mutual fund		60.4			60.4		—		—
Preferred stocks		1.5			1.5		—		—
U.S. Treasury futures:
Cash collateral		0.3			0.3		—		—
Forward contracts:
Receivable (foreign currency)		0.1			—		0.1		—
Total Pension Plan investments		296.0		$	178.7	$	93.2	$	24.1
Interest and dividends receivable		1.6
Receivable from broker for securities sold		20.6
Payable to broker for securities purchased		(25.2	)
Total OGE Energy Pension Plan assets	$	293.0
Pension Plan investments attributable to affiliates		(54.1	)
Total OG&E Pension Plan assets	$	238.9

(A)

GAAP allows the measurement of certain investments that do not have a readily determinable fair value at the net asset value. These investments do not consider the observability of inputs; therefore, they are not included within the fair value hierarchy.

(B)

This category represents U.S. Treasury notes and bonds with a Moody's Investors Service rating of Aaa and Government Agency Bonds with a Moody's Investors Service rating of A1 or higher.

(C)

This category represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.

Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes [Line Items]
Current Federal Tax Expense (Benefit)	$ 46.1	$ 250.8	$ 16.4
Current State and Local Tax Expense (Benefit)	(2.2)	28.8	1.7
Current Income Tax Expense (Benefit)	43.9	279.6	18.1
Deferred Federal Income Tax Expense (Benefit)	18.1	(110.8)	133.1
Deferred State and Local Income Tax Expense (Benefit)	(5.8)	(45.2)	(10.0)
Deferred Income Tax Expense (Benefit)	12.3	(156.0)	123.1
Income Tax Expense	56.2	123.6	141.2
Og and E [Member]
Income Taxes [Line Items]
Current Federal Tax Expense (Benefit)	48.9	(141.2)	(9.0)
Current State and Local Tax Expense (Benefit)	3.7	(0.9)	9.0
Current Income Tax Expense (Benefit)	52.6	(142.1)	0.0
Deferred Federal Income Tax Expense (Benefit)	18.8	219.9	58.3
Deferred State and Local Income Tax Expense (Benefit)	(2.6)	(1.4)	(16.5)
Deferred Income Tax Expense (Benefit)	16.2	218.5	41.8
Income Tax Expense	$ 68.8	$ 76.4	$ 41.8

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Long-Term Debt (Additional Information) (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2023

Apr. 30, 2023

Jan. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Debt Instrument [Line Items]

Percent of Principal Amount Subject to Optional Tender

100.00%

Line of Credit Facility, Maximum Borrowing Capacity

$ 1,150.0

Term Loan [Member] | Series Due May 24, 2025 [Member] | Maximum [Member]

Debt Instrument [Line Items]

Debt Instrument, Interest Rate, Stated Percentage

6.375%

Term Loan [Member] | Series Due May 24, 2025 [Member] | Minimum [Member]

Debt Instrument [Line Items]

Debt Instrument, Interest Rate, Stated Percentage

5.375%

OG&E [Member]

Debt Instrument [Line Items]

Long-Term Debt, Maturity, Year Two

$ 79.4

Long-Term Debt, Maturity, Year Four

181.0

Long-term Debt, Maturities, Repayments of Principal in Year Five

500.0

Line of Credit Facility, Current Borrowing Capacity

^[1],[2]

$ 550.0

Maturity

^[1],[2],[3]

Dec. 18, 2028

OGE Energy [Member]

Debt Instrument [Line Items]

Long-Term Debt, Maturity, Year Two

$ 129.4

Long-Term Debt, Maturity, Year Four

181.0

Long-term Debt, Maturities, Repayments of Principal in Year Five

500.0

Line of Credit Facility, Current Borrowing Capacity

^[4]

$ 550.0

Maturity

^[3],[4]

Dec. 18, 2028

OGE Energy [Member] | Series Due May 24, 2025 [Member]

Debt Instrument [Line Items]

Long term debt

$ 100.0

OGE Energy [Member] | Credit Facility [Member] | Series Due May 24, 2025 [Member]

Debt Instrument [Line Items]

Long term debt

50.0

OGE Energy [Member] | Term Loan [Member]

Debt Instrument [Line Items]

Line of Credit Facility, Current Borrowing Capacity

^[5]

$ 50.0

Maturity

^[5]

May 24, 2025

OGE Energy [Member] | Term Loan [Member] | Series Due May 24, 2025 [Member]

Debt Instrument [Line Items]

Long term debt

$ 50.0

Senior Notes [Member] | OG&E [Member] | Series Due August 15, 2028 [Member]

Debt Instrument [Line Items]

Long term debt

$ 400.0

Senior Notes [Member] | OG&E [Member] | Senior Notes due January 15, 2033 [Member]

Debt Instrument [Line Items]

Long term debt

$ 450.0

Debt Instrument, Interest Rate, Stated Percentage

5.40%

Debt Instrument, Maturity Date

Jan. 15, 2033

Senior Notes [Member] | OG&E [Member] | Senior Notes Due April 1 2053 [Member]

Debt Instrument [Line Items]

Long term debt

$ 350.0

Debt Instrument, Interest Rate, Stated Percentage

5.60%

Debt Instrument, Maturity Date

Apr. 01, 2053

Senior Notes [Member] | OG&E [Member] | Series Due May 26, 2023 [Member]

Debt Instrument [Line Items]

Long term debt

$ 0.0

500.0

$ 500.0

Debt Instrument, Interest Rate, Stated Percentage

0.553%

Debt Instrument, Maturity Date

May 26, 2023

Senior Notes [Member] | OGE Energy [Member] | Series Due May 26, 2023 [Member]

Debt Instrument [Line Items]

Long term debt

$ 0.0

$ 500.0

Debt Instrument, Interest Rate, Stated Percentage

0.703%

Debt Instrument, Maturity Date

May 26, 2023

[1]	OG&E has an intercompany borrowing agreement with OGE Energy whereby OG&E has access to up to $450.0 million of OGE Energy's revolving credit amount. This agreement has a termination date of December 18, 2028. At December 31, 2023, there was $85.1 million in intercompany borrowings under this agreement.
[2]	This bank facility is available to back up OG&E's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.
[3]	In December 2022, the Registrants entered into an amendment to their credit facility that gave each of the Registrants the option of extending such commitments for up to two additional one-year periods. On December 18, 2023, the Registrants utilized the first extension option for an additional one-year period extending the term until December 2028.
[4]	This bank facility is available to back up OGE Energy's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.
[5]	OGE Energy has a $100.0 million floating rate unsecured three-year credit agreement, of which $50.0 million is considered a revolving loan and $50.0 million is considered a term loan. The credit agreement, under certain circumstances, may be increased to a maximum commitment limit of $135.0 million and includes a maximum leverage ratio of 0.65 to 1.0. The other covenants under this credit agreement are substantially the same as OGE Energy's existing $550.0 million revolving credit agreement.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

Accounting Records

in future rates. Management's expected recovery of deferred costs and flowback of deferred credits generally results from specific decisions by regulators granting such ratemaking treatment.

The following table presents a summary of OG&E's regulatory assets and liabilities.


December 31 (In millions)	2023		2022
REGULATORY ASSETS
Current:
Oklahoma Energy Efficiency Rider under recoveries (A)	$	3.8	$	7.7
Oklahoma fuel clause under recoveries		—		474.3
Arkansas fuel clause under recoveries		—		40.6
Other (A)		2.7		4.7
Total current regulatory assets	$	6.5	$	527.3
Non-current:
Oklahoma deferred storm expenses	$	261.1	$	206.3
Pension tracker		91.9		57.2
Benefit obligations regulatory asset		89.4		119.7
Arkansas Winter Storm Uri costs		71.0		78.2
Sooner Dry Scrubbers		17.2		18.1
Arkansas deferred pension expenses		12.7		12.3
Unamortized loss on reacquired debt		7.2		8.0
COVID-19 impacts		6.8		7.7
Oklahoma SAP S/4 HANA deferred expenses		6.0		0.7
Frontier Plant deferred expenses		3.6		5.2
Other		10.7		10.9
Total non-current regulatory assets	$	577.6	$	524.3
REGULATORY LIABILITIES
Current:
Oklahoma fuel clause over recoveries	$	15.6	$	—
SPP cost tracker over recovery (B)		10.4		3.0
Arkansas fuel clause over recoveries		4.9		—
Other (B)		2.3		2.5
Total current regulatory liabilities	$	33.2	$	5.5
Non-current:
Income taxes refundable to customers, net	$	838.0	$	894.7
Accrued removal obligations, net		222.0		250.5
Other		1.6		1.9
Total non-current regulatory liabilities	$	1,061.6	$	1,147.1

(A)

Included in Other Current Assets in the balance sheets.

(B)

Included in Other Current Liabilities in the balance sheets.

The following table presents a summary of the components of the benefit obligations regulatory asset.


December 31 (In millions)	2023		2022
Pension Plan and Restoration of Retirement Income Plan:
Net loss	$	75.9	$	110.0
Postretirement Benefit Plans:
Net loss		13.5		9.7
Total	$	89.4	$	119.7

fuel and over recovers fuel costs when prices decline below the baseline charge for fuel. Provisions in the fuel clauses are intended to allow OG&E to amortize under and over recovery balances.

Accrued removal obligations, net represents asset removal costs previously recovered from ratepayers.

Use of Estimates

Cash and Cash Equivalents

Allowance for Uncollectible Accounts Receivable

Fuel Inventories

Property, Plant and Equipment


December 31, 2023 (In millions)	Percentage Ownership			Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
McClain Plant (A)		77	%	$	265.4	$	129.2	$	136.2
Redbud Plant (A)(B)		51	%	$	548.9	$	245.5	$	303.4

(A)

Construction work in progress was $0.3 million and $2.0 million for the McClain and Redbud Plants, respectively.

(B)

This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.


December 31, 2022 (In millions)	Percentage Ownership			Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
McClain Plant (A)		77	%	$	261.9	$	119.4	$	142.5
Redbud Plant (A)(B)		51	%	$	542.1	$	225.2	$	316.9

(A)

Construction work in progress was $0.7 million and $1.5 million for the McClain and Redbud Plants, respectively.

(B)

This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $78.3 million.

The following tables present the Registrants' major classes of property, plant and equipment and related accumulated depreciation.


December 31, 2023 (In millions)	Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
OG&E:
Distribution assets	$	6,290.1	$	1,564.3	$	4,725.8
Electric generation assets (A)		5,295.9		2,081.0		3,214.9
Transmission assets (B)		3,306.7		707.6		2,599.1
Intangible plant		568.5		219.8		348.7
Other property and equipment		643.1		236.7		406.4
OG&E property, plant and equipment		16,104.3		4,809.4		11,294.9
Non-OG&E property, plant and equipment		6.1		—		6.1
Total OGE Energy property, plant and equipment	$	16,110.4	$	4,809.4	$	11,301.0

(A)

This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.

(B)

This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.1 million.


December 31, 2022 (In millions)	Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
OG&E:
Distribution assets	$	5,781.3	$	1,527.1	$	4,254.2
Electric generation assets (A)		5,188.1		1,982.7		3,205.4
Transmission assets (B)		3,180.5		667.9		2,512.6
Intangible plant		384.0		193.6		190.4
Other property and equipment		591.3		213.2		378.1
OG&E property, plant and equipment		15,125.2		4,584.5		10,540.7
Non-OG&E property, plant and equipment		6.1		—		6.1
Total OGE Energy property, plant and equipment	$	15,131.3	$	4,584.5	$	10,546.8

(A)

This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $78.3 million.

(B)

This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.0 million.

Depreciation and Amortization

Asset Retirement Obligations

The following table presents changes to OG&E's asset retirement obligations during the years ended December 31, 2023 and 2022.


(In millions)	2023		2022
Balance at January 1	$	78.3	$	80.2
Accretion expense		0.7		0.6
Liabilities settled (A)		—		(2.5	)
Revisions in estimated cash flows (B)		2.3		—
Balance at December 31	$	81.3	$	78.3

(A) Asset retirement obligations were settled for asbestos removal at OG&E's generating facilities.

(B) Assumptions changed related to the estimated timing and estimated cost of the removal of asbestos at OG&E's generating facilities.

Environmental Costs

Allowance for Funds Used During Construction

Collection of Sales Tax

Revenue Recognition

General

Integrated Market and Transmission

Other Revenues

Fuel Adjustment Clauses

Leases

Income Taxes

Accrued Vacation

Related Party Transactions

Accumulated Other Comprehensive Income (Loss)

The following table presents changes in the components of accumulated other comprehensive income (loss) attributable to OGE Energy during 2023 and 2022. All amounts below are presented net of tax.


	Pension Plan and Restoration of Retirement Income Plan						Postretirement Benefit Plans
(In millions)	Net Gain (Loss)			Prior Service Cost (Credit)			Net Gain (Loss)			Prior Service Cost (Credit)			Total
Balance at December 31, 2021	$	(24.9	)	$	(1.2	)	$	1.1		$	0.2		$	(24.8	)
Other comprehensive income (loss) before reclassifications		(7.6	)		—			5.5			—			(2.1	)
Amounts reclassified from accumulated other comprehensive income (loss)		1.4			0.2			—			(0.2	)		1.4
Settlement cost		13.6			—			—			—			13.6
Net current period other comprehensive income (loss)		7.4			0.2			5.5			(0.2	)		12.9
Balance at December 31, 2022		(17.5	)		(1.0	)		6.6			—			(11.9	)
Other comprehensive income (loss) before reclassifications		3.3			—			(0.8	)		—			2.5
Amounts reclassified from accumulated other comprehensive income (loss)		0.9			0.2			(0.1	)		—			1.0
Settlement cost		1.2			—			—			—			1.2
Net current period other comprehensive income (loss)		5.4			0.2			(0.9	)		—			4.7
Balance at December 31, 2023	$	(12.1	)	$	(0.8	)	$	5.7		$	—		$	(7.2	)


Details about Accumulated Other Comprehensive Income (Loss) Components	Amount Reclassified from Accumulated Other Comprehensive Income (Loss)						Affected Line Item in OGE Energy's Statements of Income
	Year Ended December 31,
(In millions)	2023			2022
Amortization of Pension Plan and Restoration of Retirement Income Plan items:
Actuarial losses	$	(1.1	)	$	(1.6	)	(A)
Prior service cost		(0.3	)		(0.3	)	(A)
Settlement cost		(1.6	)		(17.9	)	(A)
		(3.0	)		(19.8	)	Income Before Taxes
		(0.7	)		(4.6	)	Income Tax Expense
	$	(2.3	)	$	(15.2	)	Net Income

Amortization of postretirement benefit plans items:
Prior service credit	$	—		$	0.3		(A)
Actuarial gains		0.2			—		(A)
		0.2			0.3		Income Before Taxes
		0.1			0.1		Income Tax Expense
	$	0.1		$	0.2		Net Income

Total reclassifications for the period, net of tax	$	(2.2	)	$	(15.0	)	Net Income

(A)

These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 11 for additional information).

Investment in Unconsolidated Affiliates and Related Party Transactions

Investment in Unconsolidated Affiliates and Related Party Transactions (Enable)

In this Form 10-K, Enable activity is included for the relevant portion of OGE Energy's 2021 information presented through December 2, 2021. The below information is provided for prior year context.

The following table presents a reconciliation of OGE Energy's equity in earnings of unconsolidated affiliates for the period of January 1, 2021 through December 2, 2021.


(In millions)
Enable net income used to calculate OGE Energy's equity in earnings	$	470.0
OGE Energy's percent ownership at period end		25.5	%
OGE Energy's portion of Enable net income	$	119.8
Amortization of basis difference and dilution recognition (A)		50.0
Equity in earnings of unconsolidated affiliates	$	169.8

(A)

Includes loss on dilution, net of proportional basis difference recognition.

Related Party Transactions - OGE Energy and Enable

Prior to December 2, 2021, OGE Energy charged operating costs to Enable based on several factors, and operating costs directly related to Enable were assigned as such.

Related Party Transactions - OG&E and Enable


(In millions)
Operating revenues:
Electricity to power electric compression assets	$	13.3
Fuel, purchased power and direct transmission expense:
Natural gas transportation services	$	32.7
Natural gas sales	$	(33.5	)

Investment in Equity Securities of Energy Transfer

Reclassifications

Commitments and Contingencies - Additional Information (Details) $ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) Megawattsday Turbine Segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts \| $		$ 48.8	$ 58.0	$ 55.8
Damages sought, description	In July 2023, OG&E was named, along with its contractor, as a defendant in a lawsuit filed by an apartment owner and its insurance companies seeking in excess of $60.0 million in damages related to a fire at an apartment building under construction in Oklahoma City. Several additional defendants have also been named. OG&E disputes the claims in the lawsuit and intends to vigorously defend this action. If OG&E was ultimately deemed liable for damages in connection with this incident, OG&E believes its existing insurance policies will cover its costs, in excess of a required retention (the amount of which is not material), to satisfy any liability it may have. Due to the uncertain and preliminary nature of this litigation, the outcome cannot be predicted, and OG&E is unable to provide a range of possible loss in this matter.
Damage from Fire [Member]
Loss Contingencies [Line Items]
Damages sought \| $	$ 60.0
CPV Keenan [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts \| $		23.0	25.8	27.3
Edison Mission Energy [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts \| $		20.5	24.9	21.7
NextEra Energy [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts \| $		$ 5.3	$ 7.3	$ 6.8
OG&E long-term service agreement commitments [Member] \| McClain Plant [Member]
Loss Contingencies [Line Items]
Factored-Fired Hours \| Segment		128,000
Factored-Fired Starts \| Segment		4,800
OG&E long-term service agreement commitments [Member] \| Redbud Plant [Member]
Loss Contingencies [Line Items]
Factored-Fired Hours \| Segment		144,000
Factored-Fired Starts \| Segment		4,500
Additional Factored-Fired Hours \| Segment		24,000
OG&E Generation Capacity Construction Commitments [Member] \| Horseshoe Lake [Member]
Loss Contingencies [Line Items]
Number of hydrogen capable combustion turbines \| Turbine		2
Current energy generation capacity \| Megawattsday		448

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Income Taxes [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

The following table presents the components of income tax expense (benefit).


	OGE Energy									OG&E
Year Ended December 31 (In millions)	2023			2022			2021			2023			2022			2021
Provision (benefit) for current income taxes:
Federal	$	46.1		$	250.8		$	16.4		$	48.9		$	(141.2	)	$	(9.0	)
State		(2.2	)		28.8			1.7			3.7			(0.9	)		9.0
Total provision (benefit) for current income taxes		43.9			279.6			18.1			52.6			(142.1	)		—
Provision (benefit) for deferred income taxes, net:
Federal		18.1			(110.8	)		133.1			18.8			219.9			58.3
State		(5.8	)		(45.2	)		(10.0	)		(2.6	)		(1.4	)		(16.5	)
Total provision (benefit) for deferred income taxes, net		12.3			(156.0	)		123.1			16.2			218.5			41.8
Total income tax expense	$	56.2		$	123.6		$	141.2		$	68.8		$	76.4		$	41.8

Schedule of Effective Income Tax Rate Reconciliation

The following table presents a reconciliation of the statutory tax rates to the effective income tax rate.


	OGE Energy									OG&E
Year Ended December 31	2023			2022			2021			2023			2022			2021
Statutory federal tax rate		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%
State income taxes, net of federal income tax benefit		(1.3	)		(1.0	)		0.9			0.3			(0.4	)		(1.4	)
Stock-based compensation		0.1			—			0.1			—			—			—
Executive compensation limitation		0.2			0.1			0.1			—			—			—
Amortization of net unfunded deferred taxes		(7.0	)		(3.2	)		(2.1	)		(6.7	)		(5.0	)		(4.6	)
Federal renewable energy credit (A)		—			—			(2.0	)		—			—			(4.4	)
Remeasurement of state deferred taxes due to Energy Transfer merger		—			—			(1.1	)		—			—			—
Remeasurement of state deferred tax liabilities		—			(0.6	)		(0.6	)		—			—			—
401(k) dividends		(0.3	)		(0.2	)		(0.2	)		—			—			—
Other		(0.8	)		(0.4	)		—			(0.7	)		(0.8	)		(0.2	)
Effective income tax rate		11.9	%		15.7	%		16.1	%		13.9	%		14.8	%		10.4	%

(A)

Represents credits primarily associated with the production from OG&E's wind farms.

Schedule of Deferred Tax Assets and Liabilities

The following table presents the components of Deferred Income Taxes at December 31, 2023 and 2022.


	OGE Energy						OG&E
December 31 (In millions)	2023			2022			2023			2022
Deferred income tax liabilities, net:
Accelerated depreciation and other property related differences	$	1,753.8		$	1,714.5		$	1,753.8		$	1,714.5
Regulatory assets		67.6			54.8			67.6			54.7
Pension Plan		21.8			18.0			37.9			35.4
Corporate owned life insurance		2.6			2.4			—			—
Bond redemption-unamortized costs		1.4			1.6			1.4			1.6
Income taxes recoverable from customers, net		(202.7	)		(216.7	)		(202.7	)		(216.7	)
State tax credits		(228.8	)		(221.2	)		(213.5	)		(208.5	)
Regulatory liabilities		(54.4	)		(60.8	)		(54.4	)		(60.8	)
Asset retirement obligations		(19.7	)		(18.8	)		(19.7	)		(18.8	)
Postretirement medical and life insurance benefits		(20.8	)		(19.2	)		(14.0	)		(12.7	)
Accrued liabilities		(13.2	)		(11.2	)		(5.5	)		(7.3	)
Deferred federal investment tax credits		(2.7	)		(2.9	)		(2.7	)		(2.9	)
Accrued vacation		(1.4	)		(1.4	)		(1.4	)		(1.1	)
Uncollectible accounts		(0.5	)		(0.5	)		(0.4	)		(0.5	)
Other		(2.2	)		(5.1	)		(5.6	)		(5.8	)
Total deferred income tax liabilities, net	$	1,300.8		$	1,233.5		$	1,340.8		$	1,271.1

Schedule of Unrecognized Tax Benefits Roll Forward

The following table presents a reconciliation of the Registrants' total gross unrecognized tax benefits as of the years ended December 31, 2023, 2022 and 2021.


(In millions)	2023		2022			2021
Balance at January 1	$	20.7	$	22.4		$	21.9
Tax positions related to current year:
Additions		7.9		—			1.7
Reductions		—		(1.7	)		(1.2	)
Balance at December 31	$	28.6	$	20.7		$	22.4

Summary of Tax Credit Carryforwards


	OGE Energy				OG&E
(In millions)	Carry Forward Amount		Deferred Tax Asset		Carry Forward Amount		Deferred Tax Asset		Earliest Expiration Date
State tax credits:
Oklahoma investment tax credits	$	259.1	$	204.7	$	239.8	$	189.4	N/A
Oklahoma capital investment board credits	$	12.8	$	12.8	$	12.8	$	12.8	N/A
Oklahoma zero emission tax credits	$	16.0	$	11.3	$	16.0	$	11.3	2028

N/A - not applicable

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Unrecorded Unconditional Purchase Obligations Disclosure

The following table presents the Registrants' future purchase obligations and commitments estimated for the next five years.


(In millions)	2024		2025		2026		2027		2028		Total
Purchase obligations and commitments:
Minimum purchase commitments	$	118.4	$	100.5	$	69.7	$	56.9	$	46.6	$	392.1
Estimated wind power purchase commitments		56.6		56.9		57.3		57.8		58.4		287.0
Capacity commitments		32.4		33.0		40.2		41.4		—		147.0
Long-term service agreement commitments		14.8		16.6		16.6		9.9		3.0		60.9
Generation capacity construction commitments		126.5		137.8		38.3		—		—		302.6
Total purchase obligations and commitments	$	348.7	$	344.8	$	222.1	$	166.0	$	108.0	$	1,189.6

Schedule of Wind Purchased Power

The following table presents OG&E's wind purchased power contracts.


Company	Location	Original Term of Contract	Expiration of Contract	MWs
CPV Keenan	Woodward County, OK	20 years	2030		152.0
Edison Mission Energy	Dewey County, OK	20 years	2031		130.0
NextEra Energy	Blackwell, OK	20 years	2032		60.0

The following table presents a summary of OG&E's wind power purchases for the years ended December 31, 2023, 2022 and 2021.


Year Ended December 31 (In millions)	2023		2022		2021
CPV Keenan	$	23.0	$	25.8	$	27.3
Edison Mission Energy		20.5		24.9		21.7
NextEra Energy		5.3		7.3		6.8
Total wind power purchased	$	48.8	$	58.0	$	55.8

Retirement Plans and Postretirement Benefit Plans - Summary of Reconciliation of Postretirement Benefit Plans Investments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Level 3 Asset Value, Beginning of Period	$ 21.6
Claims paid	(4.5)
Realized losses	(0.9)
Investment fees	(0.1)
Interest income	0.7
Level 3 Asset Value, End of Period	$ 16.8

Leases (Tables)

12 Months Ended

Dec. 31, 2023

Leases [Abstract]

Schedule of Financial Statement Information of Lease Liabilities


	OGE Energy						OG&E
	Year Ended December 31,						Year Ended December 31,
(In millions)	2023		2022		2021		2023		2022		2021
Operating lease cost	$	6.4	$	5.9	$	6.3	$	6.4	$	5.9	$	5.7
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	5.2	$	5.3	$	6.3	$	5.2	$	5.3	$	5.7
Right-of-use assets obtained in exchange for new operating lease liabilities	$	—	$	1.5	$	—	$	—	$	1.5	$	—


	OGE Energy						OG&E
(Dollars in millions)	December 31, 2023			December 31, 2022			December 31, 2023			December 31, 2022
Right-of-use assets at period end (A)	$	25.9		$	30.2		$	25.9		$	30.2
Operating lease liabilities at period end (B)	$	30.5		$	34.8		$	30.5		$	34.8
Operating lease weighted-average remaining lease term (in years)		11.4			11.6			11.4			11.6
Operating lease weighted-average discount rate		4.0	%		4.0	%		4.0	%		4.0	%

(A)

Included in Property, Plant and Equipment in the Registrants' balance sheets.

(B)

Included in Other Deferred Credits and Other Liabilities in the Registrants' balance sheets.

Schedule of Maturity Analysis of Operating Lease Liabilities

The following table presents a maturity analysis of the Registrants' operating lease liabilities.


Future minimum operating lease payments as of December 31:	OGE Energy		OG&E
(In millions)
2024	$	3.7	$	3.7
2025		3.5		3.5
2026		3.0		3.0
2027		3.0		3.0
2028		3.1		3.1
Thereafter		22.6		22.6
Total future minimum lease payments		38.9		38.9
Less: Imputed interest		8.4		8.4
Present value of net minimum lease payments	$	30.5	$	30.5

Summary of Significant Accounting Policies - Schedule of Regulatory Assets and Liabilities (Details) - USD ($)
$ in Millions

Dec. 31, 2023

Dec. 31, 2022

Schedule of Regulatory Assets and Liabilities [Line Items]

Fuel clause under recoveries

$ 0.0

$ 514.9

Regulatory Assets, Current

6.5

527.3

Regulatory Assets, Noncurrent

577.6

524.3

Regulatory Liability, Current

33.2

5.5

Regulatory Liability, Noncurrent

1,061.6

1,147.1

OKLAHOMA [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Fuel clause under recoveries

0.0

474.3

ARKANSAS [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Fuel clause under recoveries

0.0

40.6

SPP Cost Tracker Over Recoveries [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Liability, Current

^[1]

10.4

3.0

Oklahoma fuel clause over recoveries [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Liability, Current

15.6

0.0

Arkansas fuel clause over recoveries [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Liability, Current

4.9

0.0

Income taxes recoverable from customers, net [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Liability, Noncurrent

838.0

894.7

Accrued removal obligations [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Liability, Noncurrent

222.0

250.5

Pension tracker [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Assets, Noncurrent

91.9

57.2

Other Regulatory Liabilities [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Liability, Current

^[1]

2.3

2.5

Regulatory Liability, Noncurrent

1.6

1.9

Oklahoma Energy Efficiency Rider Under Recovery [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Assets, Current

^[2]

3.8

7.7

Benefit obligations regulatory asset [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Assets, Noncurrent

89.4

119.7

Deferred storm expenses [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Assets, Noncurrent

261.1

206.3

Unamortized loss on reacquired debt [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Assets, Noncurrent

7.2

8.0

Deferred Pension Expenses [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Assets, Noncurrent

12.7

12.3

Dry Scrubber Regulatory Asset [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Assets, Noncurrent

17.2

18.1

Other Regulatory Assets [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Assets, Current

^[2]

2.7

4.7

Regulatory Assets, Noncurrent

10.7

10.9

Deferred Plant Expense [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Assets, Noncurrent

3.6

5.2

COVID-19 Deferred Expenses [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Assets, Noncurrent

6.8

7.7

SAP S/4 HANA Deferred Expenses [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Assets, Noncurrent

6.0

0.7

Winter Storm Uri costs [Member] | ARKANSAS [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Assets, Noncurrent

$ 71.0

$ 78.2

[1]	Included in Other Current Liabilities in the balance sheets.
[2]	Included in Other Current Assets in the balance sheets.

Summary of Significant Accounting Policies - Reconciliation of Equity in Earnings (Losses) of Unconsolidated Affiliates (Details) - USD ($)
$ in Millions

11 Months Ended

12 Months Ended

Dec. 02, 2021

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Schedule of Equity Method Investments [Line Items]

Net income (loss)

$ 416.8

$ 665.7

$ 737.3

Proportionate Unconsolidated Affiliate Net Income

$ 119.8

Amortization of basis difference and dilution recognition

^[1]

50.0

Equity in earnings of unconsolidated affiliates

$ 169.8

$ 0.0

$ 169.8

OGE Holdings [Member]

Schedule of Equity Method Investments [Line Items]

Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest

25.50%

Equity Method Investment Nonconsolidated Investees [Member]

Schedule of Equity Method Investments [Line Items]

Equity in earnings of unconsolidated affiliates

$ 470.0

[1]	Includes loss on dilution, net of proportional basis difference recognition.

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

+ Details

Revenue Recognition

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

Revenue Recognition

3. Revenue Recognition

The following table presents OG&E's revenues from contracts with customers disaggregated by customer classification. OG&E's operating revenues disaggregated by customer classification can be found in "OG&E (Electric Company) Results of Operations" within "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations."


	Year Ended December 31,
(In millions)	2023		2022			2021
Residential	$	1,008.6	$	1,272.6		$	1,309.1
Commercial		674.6		803.3			749.1
Industrial		229.6		317.3			323.1
Oilfield		207.8		304.3			312.8
Public authorities and street light		228.5		291.6			284.4
System sales revenues		2,349.1		2,989.1			2,978.5
Provision for rate refund		2.0		(1.2	)		—
Integrated market		71.6		163.8			468.9
Transmission		143.0		131.7			140.2
Other		41.6		20.8			1.1
Revenues from contracts with customers	$	2,607.3	$	3,304.2		$	3,588.7

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-9

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-10

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-15

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-13

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org//606/tableOfContent

+ Details

Fair Value Measures and Disclosures (Policies)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Fair Value Measurement, Policy

The classification of the Registrants' fair value measurements requires judgment regarding the degree to which market data is observable or corroborated by observable market data. GAAP establishes a fair value hierarchy that prioritizes the inputs used to measure fair value based on observable and unobservable data. The hierarchy categorizes the inputs into three levels, with the highest priority given to quoted prices in active markets for identical unrestricted assets or liabilities (Level 1) and the lowest priority given to unobservable inputs (Level 3). Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The three levels defined in the fair value hierarchy are as follows:

Level 1 inputs are quoted prices in active markets for identical unrestricted assets or liabilities that are accessible at the measurement date.

Level 2 inputs are inputs other than quoted prices in active markets included within Level 1 that are either directly or indirectly observable at the reporting date for the asset or liability for substantially the full term of the asset or liability. Level 2 inputs include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active.

Level 3 inputs are prices or valuation techniques for the asset or liability that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity). Unobservable inputs reflect the reporting entity's own assumptions about the assumptions that market participants would use in pricing the asset or liability (including assumptions about risk).

Summary of Significant Accounting Policies - Summary of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated other comprehensive income (loss)	$ (11.9)	$ (24.8)
Other comprehensive income (loss) before reclassifications	2.5	(2.1)
Amounts reclassified from accumulated other comprehensive income (loss)	1.0	1.4
Settlement cost	1.2	13.6	$ 6.0
Net current period other comprehensive income (loss)	4.7	12.9	7.3
Accumulated other comprehensive income (loss)	(7.2)	(11.9)	(24.8)
Accumulated other comprehensive loss, net of tax	(7.2)	(11.9)
Net current period other comprehensive income (loss)	4.7	12.9	7.3
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net current period other comprehensive income (loss)	0.0
Defined Benefit Plans Income Loss [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated other comprehensive income (loss)	(17.5)	(24.9)
Other comprehensive income (loss) before reclassifications	3.3	(7.6)
Amounts reclassified from accumulated other comprehensive income (loss)	0.9	1.4
Net current period other comprehensive income (loss)	5.4	7.4
Accumulated other comprehensive income (loss)	(12.1)	(17.5)	(24.9)
Defined Benefit Plans Income Loss [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated other comprehensive income (loss)	6.6	1.1
Other comprehensive income (loss) before reclassifications	(0.8)	5.5
Amounts reclassified from accumulated other comprehensive income (loss)	(0.1)	0.0
Net current period other comprehensive income (loss)	(0.9)	5.5
Accumulated other comprehensive income (loss)	5.7	6.6	1.1
Defined Benefit Plan Prior Service Cost [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated other comprehensive income (loss)	(1.0)	(1.2)
Other comprehensive income (loss) before reclassifications	0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss)	0.2	0.2
Net current period other comprehensive income (loss)	0.2	0.2
Accumulated other comprehensive income (loss)	(0.8)	(1.0)	(1.2)
Defined Benefit Plan Prior Service Cost [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated other comprehensive income (loss)	0.0	0.2
Other comprehensive income (loss) before reclassifications	0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	(0.2)
Net current period other comprehensive income (loss)		(0.2)
Accumulated other comprehensive income (loss)	0.0	0.0	$ 0.2
Settlement Cost [Member] \| Defined Benefit Plans Income Loss [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Settlement cost	1.2	13.6
Settlement Cost [Member] \| Defined Benefit Plan Prior Service Cost [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Settlement cost	0.0	0.0
Settlement Cost [Member] \| Defined Benefit Plan Prior Service Cost [Member] \| Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Settlement cost	$ 0.0	$ 0.0

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Accelerated depreciation and other property related differences	$ 1,753.8	$ 1,714.5
Regulatory assets	67.6	54.8
Pension Plan	21.8	18.0
Corporate owned life insurance	2.6	2.4
Bond redemption-unamortized costs	1.4	1.6
Income taxes recoverable from customers, net	(202.7)	(216.7)
State tax credits	(228.8)	(221.2)
Regulatory liabilities	(54.4)	(60.8)
Asset retirement obligations	(19.7)	(18.8)
Postretirement medical and life insurance benefits	(20.8)	(19.2)
Accrued liabilities	(13.2)	(11.2)
Deferred federal investment tax credits	(2.7)	(2.9)
Accrued vacation	(1.4)	(1.4)
Uncollectible accounts	(0.5)	(0.5)
Other	(2.2)	(5.1)
Deferred Income Tax Liabilities, Net, Total	1,300.8	1,233.5
Og and E [Member]
Income Taxes [Line Items]
Accelerated depreciation and other property related differences	1,753.8	1,714.5
Regulatory assets	67.6	54.7
Pension Plan	37.9	35.4
Corporate owned life insurance	0.0	0.0
Bond redemption-unamortized costs	1.4	1.6
Income taxes recoverable from customers, net	(202.7)	(216.7)
State tax credits	(213.5)	(208.5)
Regulatory liabilities	(54.4)	(60.8)
Asset retirement obligations	(19.7)	(18.8)
Postretirement medical and life insurance benefits	(14.0)	(12.7)
Accrued liabilities	(5.5)	(7.3)
Deferred federal investment tax credits	(2.7)	(2.9)
Accrued vacation	(1.4)	(1.1)
Uncollectible accounts	(0.4)	(0.5)
Other	(5.6)	(5.8)
Deferred Income Tax Liabilities, Net, Total	$ 1,340.8	$ 1,271.1

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Stock-Based Compensation - Share-based Compensation, Activity (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Instruments Other than Options, Forfeited in Period

(8,009)

Total Shareholder Return [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted

213,442

216,437

249,909

Total Shareholder Return [Member] | Og and E [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted

65,069

60,923

68,720

Performance Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance

608,375

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted

^[1]

213,442

Equity Instruments Other than Options, Converted in Period

^[2]

(161,690)

Equity Instruments Other than Options, Vested in Period

(234,672)

Equity Instruments Other than Options, Forfeited in Period

(8,009)

Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance

652,118

608,375

Awards Other than Options, Fully Vested

^[3]

234,672

Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value

$ 3.7

Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value

28.8

Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested

$ 12.7

Performance Units [Member] | Og and E [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance

170,623

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted

^[1]

65,069

Equity Instruments Other than Options, Converted in Period

^[2]

(44,550)

Equity Instruments Other than Options, Vested in Period

(63,506)

Equity Instruments Other than Options, Forfeited in Period

(5,889)

Equity Other Than Options, Employee Migration

^[4]

(1,416)

Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance

183,837

170,623

Awards Other than Options, Fully Vested

^[3]

63,506

Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value

$ 1.0

Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value

8.0

Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested

$ 3.4

Restricted Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance

189,483

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted

114,926

116,539

89,197

Equity Instruments Other than Options, Vested in Period

(76,664)

Equity Instruments Other than Options, Forfeited in Period

(4,599)

Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance

223,146

189,483

Equity Instruments Other than Options, Vested, Aggregrate Intrinsic Value

$ 2.7

Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value

$ 7.8

Restricted Stock [Member] | Og and E [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Beginning Balance

52,759

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted

35,034

32,804

22,911

Equity Instruments Other than Options, Vested in Period

(20,265)

Equity Instruments Other than Options, Forfeited in Period

(2,725)

Equity Other Than Options, Employee Migration

^[4]

(559)

Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance

64,244

52,759

Equity Instruments Other than Options, Vested, Aggregrate Intrinsic Value

$ 0.7

Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value

$ 2.2

[1]	For performance units, this represents the target number of performance units granted. Actual number of performance units earned, if any, is dependent upon performance and may range from zero percent to 200 percent of the target.
[2]	These amounts represent performance units that vested at December 31, 2022, which were settled in February 2023.
[3]	These amounts represent performance units that vested at December 31, 2023. Actual expected amounts to be paid out in 2024 will differ based on the percentage at which the performance metric was met and are dependent upon Compensation Committee approval.
[4]	Due to certain employees transferring between OG&E and OGE Energy.

Retirement Plans and Postretirement Benefit Plans

12 Months Ended

Dec. 31, 2023

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Retirement Plans and Postretirement Benefit Plans

11. Retirement Plans and Postretirement Benefit Plans

OGE Energy sponsors defined benefit pension plans, 401(k) savings plans and other postretirement plans covering certain employees of the Registrants.

Pension Plan and Restoration of Retirement Income Plan

OGE Energy periodically makes contributions to the Pension Plan considering information such as net periodic pension expense and funded status from OGE Energy's actuarial consultants. Such contributions are intended to provide not only for benefits attributed to service to date but also for those expected to be earned in the future. OGE Energy did not make a contribution to its Pension Plan during 2023 and 2022 but does expect to make a $10.0 million contribution to its Pension Plan in 2024. Any additional contribution to the Pension Plan during 2024 would be a discretionary contribution, anticipated to be in the form of cash, and is not required to satisfy the minimum regulatory funding requirement specified by the Employee Retirement Income Security Act of 1974, as amended. OGE Energy could be required to make additional contributions if the value of its pension trust and postretirement benefit plan trust assets are adversely impacted by a major market disruption in the future.

In accordance with ASC Topic 715, "Compensation - Retirement Benefits," a one-time settlement charge is required to be recorded by an organization when lump sum payments or other settlements that relieve the organization from the responsibility for the pension benefit obligation during the plan year exceed the service cost and interest cost components of the organization's net periodic pension cost. During 2023, 2022 and 2021, the Registrants experienced an increase in both the number of employees electing to retire and the amount of lump sum payments paid to such employees upon retirement, which resulted in the Registrants recording pension plan settlement charges as presented in the Pension Plan net periodic benefit cost tables below. The pension settlement charges did not require a cash outlay by the Registrants and did not increase total pension expense over time, as the charges were an acceleration of costs that otherwise would be recognized as pension expense in future periods.

OGE Energy provides a Restoration of Retirement Income Plan to those participants in OGE Energy's Pension Plan whose benefits are subject to certain limitations of the Code. Participants in the Restoration of Retirement Income Plan receive the same benefits that they would have received under OGE Energy's Pension Plan in the absence of limitations imposed by the federal tax laws. The Restoration of Retirement Income Plan is intended to be an unfunded plan.

OG&E's employees participate in OGE Energy's Pension Plan and Restoration of Retirement Income Plan.

Obligations and Funded Status


	OGE Energy												OG&E
	Pension Plan						Restoration of Retirement Income Plan						Pension Plan						Restoration of Retirement Income Plan
December 31 (In millions)	2023			2022			2023			2022			2023			2022			2023			2022
Change in benefit obligation
Beginning obligations	$	358.5		$	502.9		$	5.8		$	5.9		$	288.5		$	363.2		$	0.5		$	0.5
Service cost		5.4			7.6			1.0			1.1			4.4			6.2			—			—
Interest cost		15.9			15.7			0.3			0.2			12.6			12.1			—			—
Plan settlements		(62.8	)		(95.8	)		(1.4	)		(1.5	)		(57.7	)		(38.8	)		(0.7	)		—
Actuarial losses (gains)		0.8			(56.9	)		(0.2	)		0.1			2.7			(41.3	)		0.2			—
Benefits paid		(14.1	)		(15.0	)		—			—			(11.9	)		(12.9	)		—			—
Ending obligations	$	303.7		$	358.5		$	5.5		$	5.8		$	238.6		$	288.5		$	—		$	0.5

Change in plans' assets
Beginning fair value	$	293.0		$	486.0		$	—		$	—		$	238.9		$	353.0		$	—		$	—
Actual return on plans' assets		27.6			(82.2	)		—			—			22.1			(62.4	)		—			—
Employer contributions		—			—			1.4			0.2			—			—			0.7			—
Plan settlements		(62.8	)		(95.8	)		(1.4	)		(0.2	)		(57.7	)		(38.8	)		(0.7	)		—
Benefits paid		(14.1	)		(15.0	)		—			—			(11.9	)		(12.9	)		—			—
Ending fair value	$	243.7		$	293.0		$	—		$	—		$	191.4		$	238.9		$	—		$	—
Funded status at end of year	$	(60.0	)	$	(65.5	)	$	(5.5	)	$	(5.8	)	$	(47.2	)	$	(49.6	)	$	—		$	(0.5	)
Accumulated postretirement benefit obligation	$	289.5		$	342.7		$	4.9		$	4.8		$	226.5		$	275.2		$	—		$	0.4


	OGE Energy						OG&E
	Postretirement Benefit Plans						Postretirement Benefit Plans
December 31 (In millions)	2023			2022			2023			2022
Change in benefit obligation
Beginning obligations	$	101.9		$	137.3		$	76.4		$	102.4
Service cost		0.1			0.2			0.1			0.1
Interest cost		5.2			3.5			3.9			2.7
Participants' contributions		3.4			3.5			2.4			2.4
Actuarial losses (gains)		4.9			(29.1	)		4.0			(21.0	)
Benefits paid		(12.2	)		(13.5	)		(9.5	)		(10.2	)
Ending obligations	$	103.3		$	101.9		$	77.3		$	76.4

Change in plans' assets
Beginning fair value	$	32.8		$	44.3		$	29.8		$	39.9
Actual return on plans' assets		1.9			(8.2	)		1.7			(7.4	)
Employer contributions		6.8			6.7			5.2			5.1
Participants' contributions		3.4			3.5			2.4			2.4
Benefits paid		(12.2	)		(13.5	)		(9.5	)		(10.2	)
Ending fair value	$	32.7		$	32.8		$	29.6		$	29.8
Funded status at end of year	$	(70.6	)	$	(69.1	)	$	(47.7	)	$	(46.6	)

Net Periodic Benefit Cost


OGE Energy	Pension Plan									Restoration of Retirement Income Plan
Year Ended December 31 (In millions)	2023			2022			2021			2023		2022		2021
Service cost	$	5.4		$	7.6		$	11.2		$	1.0	$	1.1	$	0.8
Interest cost		15.9			15.7			13.3			0.3		0.2		0.1
Expected return on plan assets		(16.2	)		(25.4	)		(34.1	)		—		—		—
Amortization of net loss		8.0			8.9			9.4			—		0.2		0.2
Amortization of unrecognized prior service cost (A)		—			—			—			0.3		0.2		0.1
Settlement cost		21.8			30.6			41.3			0.5		0.3		2.1
Total net periodic benefit cost		34.9			37.4			41.1			2.1		2.0		3.3
Less: Amount paid by unconsolidated affiliates		—			—			(0.2	)		—		—		0.1
Net periodic benefit cost	$	34.9		$	37.4		$	41.3		$	2.1	$	2.0	$	3.2

(A)


OG&E	Pension Plan									Restoration of Retirement Income Plan
Year Ended December 31 (In millions)	2023			2022			2021			2023		2022		2021
Service cost	$	4.4		$	6.2		$	7.7		$	—	$	—	$	—
Interest cost		12.6			12.1			9.7			—		—		—
Expected return on plan assets		(12.9	)		(19.6	)		(24.7	)		—		—		—
Amortization of net loss		6.9			7.4			7.0			—		—		0.1
Settlement cost		20.4			12.9			33.1			0.4		—		1.6
Total net periodic benefit cost		31.4			19.0			32.8			0.4		—		1.7
Plus: Amount allocated from OGE Energy		3.0			5.2			6.5			1.7		1.5		1.5
Net periodic benefit cost	$	34.4		$	24.2		$	39.3		$	2.1	$	1.5	$	3.2


Year Ended December 31 (In millions)	2023		2022		2021
Change in pension expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A)	$	33.3	$	15.2	$	23.0
Deferral of pension expense related to pension settlement charges included in the above line item:
Oklahoma jurisdiction (A)	$	20.1	$	15.4	$	37.9
Arkansas jurisdiction (A)	$	1.9	$	1.4	$	3.5

(A)

Included in the pension regulatory asset in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.


	OGE Energy									OG&E
	Postretirement Benefit Plans									Postretirement Benefit Plans
Year Ended December 31 (In millions)	2023			2022			2021			2023			2022			2021
Service cost	$	0.1		$	0.2		$	0.2		$	0.1		$	0.1		$	0.1
Interest cost		5.2			3.5			3.4			3.9			2.7			2.6
Expected return on plan assets		(1.7	)		(1.8	)		(1.8	)		(1.6	)		(1.6	)		(1.7	)
Amortization of net loss		(0.2	)		1.5			2.8			—			1.5			2.7
Amortization of unrecognized prior service cost (A)		—			(3.8	)		(6.9	)		—			(3.6	)		(5.0	)
Total net periodic benefit cost (income)		3.4			(0.4	)		(2.3	)		2.4			(0.9	)		(1.3	)
Less: Amount paid by unconsolidated affiliates (B)		—			—			(0.5	)
Plus: Amount allocated from OGE Energy (B)											0.5			—			(0.5	)
Net periodic benefit cost (income)	$	3.4		$	(0.4	)	$	(1.8	)	$	2.9		$	(0.9	)	$	(1.8	)

(A)

(B)

"Amount paid by unconsolidated affiliates" is only applicable to OGE Energy. "Amount allocated from OGE Energy" is only applicable to OG&E.


Year Ended December 31 (In millions)	2023		2022		2021
Change in postretirement expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A)	$	4.4	$	0.6	$	(0.4	)

(A)

Included in the pension regulatory asset, as indicated in the regulatory assets and liabilities table in Note 1.


	OGE Energy						OG&E
(In millions)	2023		2022		2021		2023		2022		2021
Capitalized portion of net periodic pension benefit cost	$	2.2	$	3.0	$	3.4	$	1.9	$	2.5	$	2.9
Capitalized portion of net periodic postretirement benefit cost	$	0.1	$	0.2	$	0.2	$	0.1	$	0.1	$	0.1

Rate Assumptions


	Pension Plan and Restoration of Retirement Income Plan									Postretirement Benefit Plans
Year Ended December 31	2023			2022			2021			2023			2022			2021
Assumptions to determine benefit obligations:
Discount rate		5.40	%		5.45	%		2.75	%		5.35	%		5.40	%		2.80	%
Rate of compensation increase		4.20	%		4.20	%		4.20	%	N/A			N/A			N/A
Interest crediting rate		3.50	%		3.50	%		3.50	%	N/A			N/A			N/A
Assumptions to determine net periodic benefit cost:
Discount rate		5.45	%		4.01	%		2.63	%		5.40	%		2.80	%		2.45	%
Expected return on plan assets		7.00	%		7.00	%		7.00	%		4.00	%		4.00	%		4.00	%
Rate of compensation increase		4.20	%		4.20	%		4.20	%	N/A			N/A			N/A
Interest crediting rate		3.50	%		3.50	%		3.50	%	N/A			N/A			N/A

N/A - not applicable

The discount rate used to compute the present value of plan liabilities is based generally on rates of high-grade corporate bonds with maturities similar to the average period over which benefits will be paid. The discount rate used to determine net benefit cost for the current year is the same discount rate used to determine the benefit obligation as of the previous year's balance sheet date, unless a plan settlement occurs during the current year that requires an updated discount rate for net periodic cost measurement. For 2023 and 2022, the Pension Plan discount rates used to determine net periodic benefit cost are disclosed on a weighted-average basis.

The overall expected rate of return on plan assets assumption is used in determining net periodic benefit cost. The rate of return on plan assets assumption is the average long-term rate of earnings expected on the funds currently invested and to be invested for the purpose of providing benefits specified by the Pension Plan or postretirement benefit plans. This assumption is reexamined at least annually and updated as necessary. The rate of return on plan assets assumption reflects a combination of historical return analysis, forward-looking return expectations and the plans' current and expected asset allocation.

The assumed health care cost trend rates have a significant effect on the amounts reported for postretirement medical benefit plans. Future health care cost trend rates are assumed to be 6.75 percent in 2024 with the rates trending downward to 4.50 percent by 2033.

Pension Plan

Pension Plan Investments, Policies and Strategies


Projected Benefit Obligation Funded Status Thresholds	<90%	95%	100%	105%	110%	115%	120%
Fixed income	50%	58%	65%	73%	80%	85%	90%
Equity	50%	42%	35%	27%	20%	15%	10%
Total	100%	100%	100%	100%	100%	100%	100%

Within the portfolio's overall allocation to equities, the funds are allocated according to the guidelines in the following table.


Asset Class	Target Allocation	Minimum	Maximum
Domestic Large Cap Equity	40%	35%	60%
Domestic Mid-Cap Equity	15%	5%	25%
Domestic Small-Cap Equity	25%	5%	30%
International Equity	20%	10%	30%

OGE Energy has retained an investment consultant responsible for the general investment oversight, analysis, monitoring investment guideline compliance and providing quarterly reports to certain of the Registrants' members and OGE Energy's Investment Committee. The various investment managers used by the trust operate within the general operating objectives as established in the investment policy and within the specific guidelines established for each investment manager's respective portfolio.

The portfolio is rebalanced at least on an annual basis to bring the asset allocations of various managers in line with the target asset allocation listed above. More frequent rebalancing may occur if there are dramatic price movements in the financial markets which may cause the trust's exposure to any asset class to exceed or fall below the established allowable guidelines.

To evaluate the progress of the portfolio, investment performance is reviewed quarterly. It is, however, expected that performance goals will be met over a full market cycle, normally defined as a three- to five-year period. Analysis of performance is within the context of the prevailing investment environment and the advisors' investment style. The goal of the trust is to provide a rate of return consistently from three percent to five percent over the rate of inflation (as measured by the national Consumer Price Index) on a fee adjusted basis over a typical market cycle of no less than three years and no more than five years. Each investment manager is expected to outperform its respective benchmark.

The following table presents a list of each asset class utilized with appropriate comparative benchmark(s) each manager is evaluated against and the focus of the asset class.


Asset Class	Comparative Benchmark(s)	Focus of Asset Class
Active Duration Fixed Income (A)(B)	Bloomberg Barclays Aggregate	- Maximize risk-adjusted performance while providing long bond exposure managed according to the manager's forecast on interest rates. - All invested assets must reach at or above Baa3 or BBB- investment grade. - Limited five percent exposure to any single issuer, except the U.S. Government or affiliates.
Long Duration Fixed Income (A)(B)	Duration blended Barclays Long Government/Credit & Barclays Universal	- Maximize risk-adjusted performance. - At least 75 percent of invested assets must reach at or above Baaa3 or BBB- investment grade. - Limited five percent exposure to any single issuer, except the U.S. Government or affiliates. - May invest up to 10 percent of the market value in convertible bonds as long as quality guidelines are met. - May invest up to 15 percent of the market value in private placement, including 144A securities with or without registration rights and allow for futures to be traded in the portfolio.
Equity Index (B)(C)	Standard & Poor's 500 Index	- Focus on replicating the performance of the S&P 500 Index.
Mid-Cap Equity (B)(C) Small-Cap Equity (B)(C)	Russell Midcap Index Russell Midcap Value Index Russell 2000 Index Russell 2000 Value Index	- Focus on undervalued stocks expected to earn average return and pay out higher than average dividends. - Invest in companies with market capitalizations lower than average company on public exchanges: - Price/earnings ratio at or near referenced - Small dividend yield and return on equity at or near referenced index; and - Earnings per share growth rate at or near referenced index.
International Equity (D)	Morgan Stanley Capital International ACWI ex-U.S.	- Invest in non-dollar denominated equity securities. - Diversify the overall trust investments.

(A)

Investment grades are by Moody's Investors Service, S&P Global Ratings or Fitch Ratings.

(B)

The purchase of any of OGE Energy's equity, debt or other securities is prohibited.

(C)

No more than five percent can be invested in any one stock at the time of purchase and no more than 10 percent after accounting for price appreciation. Options or financial futures may not be purchased unless prior approval from OGE Energy's Investment Committee is received. The purchase of securities on margin, securities lending, private placement purchases and venture capital purchases are prohibited. The aggregate positions in any company may not exceed one percent of the fair market value of its outstanding stock.

(D)

The manager of this asset class is required to operate under certain restrictions including regional constraints, diversification requirements and percentage of U.S. securities. All securities are freely traded on a recognized stock exchange, and there are no over-the-counter derivatives. The following investment categories are excluded: options (other than traded currency options), commodities, futures (other than currency futures or currency hedging), short sales/margin purchases, private placements, unlisted securities and real estate (but not real estate shares).

Pension Plan Investments


(In millions)	December 31, 2023			Level 1		Level 2		Net Asset Value (A)
Common stocks	$	56.9		$	56.9	$	—	$	—
U.S. Treasury notes and bonds (B)		42.4			42.4		—		—
Mortgage- and asset-backed securities		22.0			—		22.0		—
Corporate fixed income and other securities		54.6			—		54.6		—
Commingled fund (C)		13.8			—		—		13.8
Foreign government bonds		0.2			—		0.2		—
U.S. municipal bonds		0.3			—		0.3		—
Money market fund		1.3			—		—		1.3
Mutual funds		55.3			55.3		—		—
Preferred stocks		1.0			1.0		—		—
U.S. Treasury futures:
Cash collateral		0.3			0.3		—		—
Forward contracts:
Receivable (foreign currency)		0.1			—		0.1		—
Total Pension Plan investments		248.2		$	155.9	$	77.2	$	15.1
Interest and dividends receivable		1.4
Receivable from broker for securities sold		8.3
Payable to broker for securities purchased		(14.2	)
Total OGE Energy Pension Plan assets	$	243.7
Pension Plan investments attributable to affiliates		(52.3	)
Total OG&E Pension Plan assets	$	191.4


(In millions)	December 31, 2022			Level 1		Level 2		Net Asset Value (A)
Common stocks	$	71.9		$	71.9	$	—	$	—
U.S. Treasury notes and bonds (B)		44.6			44.6		—		—
Mortgage- and asset-backed securities		26.2			—		26.2		—
Corporate fixed income and other securities		65.5			—		65.5		—
Commingled fund (C)		18.2			—		—		18.2
Foreign government bonds		0.5			—		0.5		—
U.S. municipal bonds		0.9			—		0.9		—
Money market fund		5.9			—		—		5.9
Mutual fund		60.4			60.4		—		—
Preferred stocks		1.5			1.5		—		—
U.S. Treasury futures:
Cash collateral		0.3			0.3		—		—
Forward contracts:
Receivable (foreign currency)		0.1			—		0.1		—
Total Pension Plan investments		296.0		$	178.7	$	93.2	$	24.1
Interest and dividends receivable		1.6
Receivable from broker for securities sold		20.6
Payable to broker for securities purchased		(25.2	)
Total OGE Energy Pension Plan assets	$	293.0
Pension Plan investments attributable to affiliates		(54.1	)
Total OG&E Pension Plan assets	$	238.9

(A)

(B)

This category represents U.S. Treasury notes and bonds with a Moody's Investors Service rating of Aaa and Government Agency Bonds with a Moody's Investors Service rating of A1 or higher.

(C)

This category represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.

As defined in the fair value hierarchy, Level 1 inputs are quoted prices in active markets for identical unrestricted assets or liabilities that are accessible by the Pension Plan at the measurement date. Level 2 inputs are inputs other than quoted prices in active markets included within Level 1 that are either directly or indirectly observable at the reporting date for the asset or liability for substantially the full term of the asset or liability. Level 2 inputs include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active. Level 3 inputs are prices or valuation techniques for the asset or liability that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity). Unobservable inputs reflect the Plan's own assumptions about the assumptions that market participants would use in pricing the asset or liability (including assumptions about risk).

Expected Benefit Payments


(In millions)	OGE Energy		OG&E
2024	$	44.4	$	35.4
2025	$	28.1	$	22.2
2026	$	27.9	$	22.4
2027	$	34.2	$	21.1
2028	$	28.0	$	21.0
2029-2033	$	122.7	$	96.3

Postretirement Benefit Plans

In addition to providing pension benefits, OGE Energy provides certain medical and life insurance benefits for eligible retired members. Regular, full-time, active employees hired prior to February 1, 2000 whose age and years of credited service total or exceed 80 or have attained at least age 55 with 10 or more years of service at the time of retirement are entitled to postretirement medical benefits, while employees hired on or after February 1, 2000 are not entitled to postretirement medical benefits. Eligible retirees must contribute such amount as OGE Energy specifies from time to time toward the cost of coverage for postretirement benefits. The benefits are subject to deductibles, co-payment provisions and other limitations. OG&E charges postretirement benefit costs to expense and includes an annual amount as a component of the cost-of-service in future ratemaking proceedings.

OGE Energy's contribution to the medical costs for pre-65 aged eligible retirees are fixed at the 2011 level, and OGE Energy covers future annual medical inflationary cost increases up to five percent. Increases in excess of five percent annually are covered by the pre-65 aged retiree in the form of premium increases. OGE Energy provides Medicare-eligible retirees and their Medicare-eligible spouses an annual fixed contribution to an OGE Energy-sponsored health reimbursement arrangement. Medicare-eligible retirees are able to purchase individual insurance policies supplemental to Medicare through a third-party administrator and use their health reimbursement arrangement funds for reimbursement of medical premiums and other eligible medical expenses.

Postretirement Plans Investments


(In millions)	December 31, 2023			Level 1		Level 3
Group retiree medical insurance contract	$	16.8		$	—	$	16.8
Mutual funds		15.9			15.9		—
Total OGE Energy plan investments	$	32.7		$	15.9	$	16.8
Plan investments attributable to affiliates		(3.1	)
Total OG&E plan investments	$	29.6


(In millions)	December 31, 2022			Level 1		Level 3
Group retiree medical insurance contract	$	21.6		$	—	$	21.6
Mutual funds		11.2			11.2		—
Total OGE Energy plan investments	$	32.8		$	11.2	$	21.6
Plan investments attributable to affiliates		(3.0	)
Total OG&E plan investments	$	29.8

The group retiree medical insurance contract invests in a pool of common stocks, bonds and money market accounts, of which a significant portion is comprised of mortgage-backed securities. The unobservable input included in the valuation of the contract includes the approach for determining the allocation of the postretirement benefit plans' pro-rata share of the total assets in the contract.

The following table presents a reconciliation of the postretirement benefit plans' investments that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3).


Year Ended December 31 (In millions)	2023
Group retiree medical insurance contract:
Beginning balance	$	21.6
Claims paid		(4.5	)
Realized losses		(0.9	)
Investment fees		(0.1	)
Interest income		0.7
Ending balance	$	16.8

Medicare Prescription Drug, Improvement and Modernization Act of 2003


(In millions)	OGE Energy		OG&E
2024	$	13.9	$	10.5
2025	$	11.5	$	8.6
2026	$	10.9	$	8.0
2027	$	9.9	$	7.4
2028	$	9.0	$	6.8
2029-2033	$	36.9	$	27.8

Post-Employment Benefit Plan

Disabled employees receiving benefits from OGE Energy's Group Long-Term Disability Plan are entitled to continue participating in OGE Energy's Medical Plan along with their dependents. The post-employment benefit obligation represents the actuarial present

value of estimated future medical benefits that are attributed to employee service rendered prior to the date as of which such information is presented. The obligation also includes future medical benefits expected to be paid to current employees participating in the Group Long-Term Disability Plan and their dependents, as defined in OGE Energy's Medical Plan.

The post-employment benefit obligation is determined by an actuary on a basis similar to the accumulated postretirement benefit obligation. The estimated future medical benefits are projected to grow with expected future medical cost trend rates and are discounted for interest at the discount rate and for the probability that the participant will discontinue receiving benefits from OGE Energy's Group Long-Term Disability Plan due to death, recovery from disability or eligibility for retiree medical benefits. OGE Energy's post-employment benefit obligation was $1.7 million and $1.8 million at December 31, 2023 and 2022, respectively, of which $1.3 million and $1.3 million, respectively, was OG&E's portion of the obligation.

401(k) Plan

OGE Energy provides a 401(k) Plan, and each regular full-time employee of OGE Energy or a participating affiliate is eligible to participate in the 401(k) Plan immediately upon hire. All other employees of OGE Energy or a participating affiliate are eligible to become participants in the 401(k) Plan after completing one year of service as defined in the 401(k) Plan. Participants may contribute each pay period any whole percentage between two percent and 75 percent of their compensation, as defined in the 401(k) Plan, for that pay period. Participants who have reached age 50 before the close of a year are allowed to make additional contributions referred to as "Catch-Up Contributions," subject to certain limitations of the Code. Participants may designate, at their discretion, all or any portion of their contributions as: (i) a before-tax contribution under Section 401(k) of the Code subject to the limitations thereof, (ii) a contribution made on a non-Roth after-tax basis or (iii) a Roth contribution. The 401(k) Plan also includes an eligible automatic contribution arrangement and provides for a qualified default investment alternative consistent with the U.S. Department of Labor regulations. Participants may elect, in accordance with the 401(k) Plan procedures, to have their future salary deferral rate to be automatically increased annually on a date and in an amount as specified by the participant in such election. For employees hired or rehired on or after December 1, 2009, OGE Energy contributes to the 401(k) Plan, on behalf of each participant, 200 percent of the participant's contributions up to five percent of compensation.

No OGE Energy contributions are made with respect to a participant's Catch-Up Contributions, rollover contributions or with respect to a participant's contributions based on overtime payments, pay-in-lieu of overtime for exempt personnel, special lump-sum recognition awards and lump-sum merit awards included in compensation for determining the amount of participant contributions. Once made, OGE Energy's contribution may be directed to any available investment option in the 401(k) Plan. OGE Energy match contributions vest over a three-year period. After two years of service, participants become 20 percent vested in their OGE Energy contribution account and become fully vested on completing three years of service. In addition, participants fully vest when they are eligible for normal or early retirement under the Pension Plan requirements, in the event of their termination due to death or permanent disability or upon attainment of age 65 while employed by OGE Energy or its affiliates. OGE Energy contributed $19.6 million, $17.1 million and $15.4 million in 2023, 2022 and 2021, respectively, to the 401(k) Plan, of which $16.0 million, $13.9 million and $12.0 million, respectively, related to OG&E.

Deferred Compensation Plan

OGE Energy provides a nonqualified deferred compensation plan which is intended to be an unfunded plan. The plan's primary purpose is to provide a tax-deferred capital accumulation vehicle for a select group of management, highly compensated employees and non-employee members of OGE Energy's Board of Directors and to supplement such employees' 401(k) Plan contributions as well as offering this plan to be competitive in the marketplace.

Eligible employees who enroll in the plan have the following deferral options: (i) eligible employees may elect to defer up to a maximum of 70 percent of base salary and 100 percent of annual bonus awards or (ii) eligible employees may elect a deferral percentage of base salary and bonus awards based on the deferral percentage elected for a year under the 401(k) Plan with such deferrals to start when maximum deferrals to the qualified 401(k) Plan have been made because of limitations in that plan. Eligible directors who enroll in the plan may elect to defer up to a maximum of 100 percent of directors' meeting fees and annual retainers. OGE Energy matches employee (but not non-employee director) deferrals to make up for any match lost in the 401(k) Plan because of deferrals to the deferred compensation plan and to allow for a match that would have been made under the 401(k) Plan on that portion of either the first six percent of total compensation or the first five percent of total compensation, depending on prior participant elections, deferred that exceeds the limits allowed in the 401(k) Plan. Matching credits vest based on years of service, with full vesting after three years or, if earlier, on retirement, disability, death, a change in control of OGE Energy or termination of the

plan. Deferrals, plus any OGE Energy match, are credited to a recordkeeping account in the participant's name. Earnings on the deferrals are indexed to the assumed investment funds selected by the participant. In 2023, those investment options included an OGE Energy Common Stock fund, whose value was determined based on the stock price of OGE Energy's Common Stock. OGE Energy accounts for the contributions related to its executive officers in this plan as Accrued Benefit Obligations and accounts for the contributions related to OGE Energy's directors in this plan as Other Deferred Credits and Other Liabilities in the balance sheets. The investment associated with these contributions is accounted for as Other Property and Investments in the balance sheets. The appreciation of these investments is accounted for as Other Income, and the increase in the liability under the plan is accounted for as Other Expense in the statements of income.

Supplemental Executive Retirement Plan

OGE Energy provides a supplemental executive retirement plan in order to attract and retain lateral hires or other executives designated by the Compensation Committee of OGE Energy's Board of Directors who may not otherwise qualify for a sufficient level of benefits under OGE Energy's Pension Plan and Restoration of Retirement Income Plan. The supplemental executive retirement plan is intended to be an unfunded plan and not subject to the benefit limitations of the Code. For the actuarial equivalence calculations, the supplemental executive retirement plan provides that (i) mortality rates shall be based on the unisex mortality table issued under Internal Revenue Service Notice 2018-02 for purposes of determining the minimum present value under Code Section 417(e)(3) for distributions with annuity starting dates that occur during stability periods beginning in the 2019 calendar year and (ii) the interest rate shall be five percent.

- Definition

The entire disclosure for retirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480794/715-70-50-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(03)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (q)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (l)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//715/tableOfContent

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (o)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (p)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (r)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (r)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480126/715-20-S99-2

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480266/715-60-50-3

+ Details

Summary of Significant Accounting Policies - Summary of Amount Reclassified Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent

$ (2.2)

$ (15.0)

Pension Plan [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax

^[1]

(1.1)

(1.6)

Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax

^[1]

(0.3)

Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax

^[1]

(1.6)

(17.9)

Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax

(3.0)

(19.8)

Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax

(0.7)

(4.6)

Amounts reclassified from accumulated other comprehensive income (loss)

(2.3)

(15.2)

Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax

^[1]

(0.3)

Other Postretirement Benefits Plan [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax

^[1]

0.2

0.0

Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax

^[1]

0.0

0.3

Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax

0.2

0.3

Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax

0.1

Amounts reclassified from accumulated other comprehensive income (loss)

0.1

0.2

Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax

^[1]

$ 0.0

$ 0.3

[1]	These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 11 for additional information).

Retirement Plans and Postretirement Benefit Plans - Summary of Gross Benefit Payments Registrants Expect to Pay (Details) $ in Millions	Dec. 31, 2023 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Postretirement Plan, Expected Future Benefit Payments, Next Twelve Months	$ 13.9
Postretirement Plan, Expected Future Benefit Payments, Year Two	11.5
Postretirement Plan, Expected Future Benefit Payments, Year Three	10.9
Postretirement Plan, Expected Future Benefit Payments in Year Four	9.9
Postretirement Plan, Expected Future Benefit Payments, Year Five	9.0
Postretirement Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	36.9
Og and E [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Postretirement Plan, Expected Future Benefit Payments, Next Twelve Months	10.5
Postretirement Plan, Expected Future Benefit Payments, Year Two	8.6
Postretirement Plan, Expected Future Benefit Payments, Year Three	8.0
Postretirement Plan, Expected Future Benefit Payments in Year Four	7.4
Postretirement Plan, Expected Future Benefit Payments, Year Five	6.8
Postretirement Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	$ 27.8

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Fair Value, by Balance Sheet Grouping

The following table presents the carrying amount and fair value of the Registrants' financial instruments at December 31, 2023 and 2022, as well as the classification level within the fair value hierarchy.


	2023				2022
December 31 (In millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Classification
Long-term Debt (including Long-term Debt due within one year):
OGE Energy Senior Notes	$	—	$	—	$	499.9	$	491.2	Level 2
OGE Energy Term Loan	$	49.9	$	50.0	$	49.8	$	50.0	Level 2
OG&E Senior Notes	$	4,146.0	$	3,922.3	$	3,854.2	$	3,477.1	Level 2
OG&E Industrial Authority Bonds	$	135.4	$	135.4	$	135.4	$	135.4	Level 2
Tinker Debt	$	9.2	$	7.1	$	9.3	$	7.3	Level 3

Retirement Plans and Postretirement Benefit Plans - Schedule of Defined Benefit Plans Disclosures (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Pension Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Service cost

$ 5.4

$ 7.6

$ 11.2

Interest cost

$ 15.9

$ 15.7

$ 13.3

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Expected return on plan assets

$ (16.2)

$ (25.4)

$ (34.1)

Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Amortization of net loss

$ 8.0

$ 8.9

$ 9.4

Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Amortization of unrecognized prior service cost

^[1]

$ 0.0

Settlement cost

21.8

30.6

41.3

Total net periodic benefit cost (income)

34.9

37.4

41.1

Less: Amount paid by unconsolidated affiliates

0.0

(0.2)

Net periodic benefit cost (income)

34.9

37.4

41.3

Pension Plan [Member] | Oklahoma Jurisdiction

Defined Benefit Plan Disclosure [Line Items]

Settlement cost

^[2]

20.1

15.4

37.9

Change in pension expense to maintain allowed recoverable amount in Oklahoma jurisdiction

^[2]

33.3

15.2

23.0

Pension Plan [Member] | Arkansas Jurisdiction

Defined Benefit Plan Disclosure [Line Items]

Settlement cost

1.9

^[2]

1.4

3.5

^[2]

Pension Plan [Member] | Og and E [Member]

Defined Benefit Plan Disclosure [Line Items]

Service cost

4.4

6.2

7.7

Interest cost

$ 12.6

$ 12.1

$ 9.7

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Expected return on plan assets

$ (12.9)

$ (19.6)

$ (24.7)

Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Amortization of net loss

$ 6.9

$ 7.4

$ 7.0

Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Settlement cost

$ 20.4

$ 12.9

$ 33.1

Total net periodic benefit cost (income)

31.4

19.0

32.8

Amount Attributable to Parent

3.0

5.2

6.5

Net periodic benefit cost (income)

34.4

24.2

39.3

Other Pension Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Service cost

1.0

1.1

0.8

Interest cost

$ 0.3

$ 0.2

$ 0.1

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Expected return on plan assets

$ 0.0

Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Amortization of net loss

$ 0.0

$ 0.2

Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Amortization of unrecognized prior service cost

^[1]

$ 0.3

$ 0.2

$ 0.1

Settlement cost

0.5

0.3

2.1

Total net periodic benefit cost (income)

2.1

2.0

3.3

Less: Amount paid by unconsolidated affiliates

0.0

0.1

Net periodic benefit cost (income)

2.1

2.0

3.2

Other Pension Plan [Member] | Og and E [Member]

Defined Benefit Plan Disclosure [Line Items]

Service cost

0.0

Interest cost

$ 0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Expected return on plan assets

$ 0.0

Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Amortization of net loss

$ 0.0

$ 0.1

Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Settlement cost

$ 0.4

$ 0.0

$ 1.6

Total net periodic benefit cost (income)

0.4

0.0

1.7

Amount Attributable to Parent

1.7

1.5

Net periodic benefit cost (income)

2.1

1.5

3.2

Other Postretirement Benefits Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Service cost

0.1

0.2

Interest cost

$ 5.2

$ 3.5

$ 3.4

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Expected return on plan assets

$ (1.7)

$ (1.8)

Amortization of net loss

$ (0.2)

$ 1.5

$ 2.8

Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Amortization of unrecognized prior service cost

^[3]

$ 0.0

$ (3.8)

$ (6.9)

Total net periodic benefit cost (income)

3.4

(0.4)

(2.3)

Less: Amount paid by unconsolidated affiliates

^[4]

0.0

(0.5)

Net periodic benefit cost (income)

3.4

(0.4)

(1.8)

Other Postretirement Benefits Plan [Member] | Oklahoma Jurisdiction

Defined Benefit Plan Disclosure [Line Items]

Change in pension expense to maintain allowed recoverable amount in Oklahoma jurisdiction

^[5]

4.4

0.6

(0.4)

Other Postretirement Benefits Plan [Member] | Og and E [Member]

Defined Benefit Plan Disclosure [Line Items]

Service cost

0.1

Interest cost

$ 3.9

$ 2.7

$ 2.6

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Expected return on plan assets

$ (1.6)

$ (1.7)

Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Amortization of net loss

$ 0.0

$ 1.5

$ 2.7

Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

Amortization of unrecognized prior service cost

^[3]

$ 0.0

$ (3.6)

$ (5.0)

Total net periodic benefit cost (income)

2.4

(0.9)

(1.3)

Amount Attributable to Parent

^[4]

0.5

0.0

(0.5)

Net periodic benefit cost (income)

$ 2.9

$ (0.9)

$ (1.8)

[1]	Unamortized prior service cost is amortized on a straight-line basis over the average remaining service period to the first eligibility age of participants who are expected to receive a benefit and are active at the date of the plan amendment.
[2]	Included in the pension regulatory asset in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.
[3]	Unamortized prior service cost is amortized on a straight-line basis over the average remaining service period to the first eligibility age of participants who are expected to receive a benefit and are active at the date of the plan amendment.
[4]	"Amount paid by unconsolidated affiliates" is only applicable to OGE Energy. "Amount allocated from OGE Energy" is only applicable to OG&E.
[5]	Included in the pension regulatory asset, as indicated in the regulatory assets and liabilities table in Note 1.

Report of Business Segments (Tables)

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Summary of OGE Energy's Business Segments

The following tables present the results of OGE Energy's business segments for the years ended December 31, 2023, 2022 and 2021.


2023	Electric Company		Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	2,674.3	$	—		$	—		$	2,674.3
Fuel, purchased power and direct transmission expense		911.7		—			—			911.7
Other operation and maintenance		505.0		(2.4	)		—			502.6
Depreciation and amortization		506.6		—			—			506.6
Taxes other than income		99.4		3.8			—			103.2
Operating income (loss)		651.6		(1.4	)		—			650.2
Other income		43.5		8.1			(7.4	)		44.2
Interest expense		199.9		28.9			(7.4	)		221.4
Income tax expense (benefit)		68.8		(12.6	)		—			56.2
Net income (loss)	$	426.4	$	(9.6	)	$	—		$	416.8
Total assets	$	12,642.6	$	301.1		$	(153.0	)	$	12,790.7
Capital expenditures	$	1,178.2	$	—		$	—		$	1,178.2


2022	Electric Company		Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	3,375.7	$	—		$	—		$	—		$	3,375.7
Fuel, purchased power and direct transmission expense		1,662.4		—			—			—			1,662.4
Other operation and maintenance		491.9		12.6			(3.1	)		—			501.4
Depreciation and amortization		460.9		—			—			—			460.9
Taxes other than income		98.0		0.1			3.4			—			101.5
Operating income (loss)		662.5		(12.7	)		(0.3	)		—			649.5
Gain on equity securities		—		282.1			—			—			282.1
Other income		11.2		10.0			4.9			(2.1	)		24.0
Interest expense		157.8		—			10.6			(2.1	)		166.3
Income tax expense (benefit)		76.4		48.1			(0.9	)		—			123.6
Net income (loss)	$	439.5	$	231.3		$	(5.1	)	$	—		$	665.7
Total assets	$	12,410.5	$	1.2		$	683.7		$	(550.7	)	$	12,544.7
Capital expenditures	$	1,050.9	$	—		$	—		$	—		$	1,050.9


2021	Electric Company		Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	3,653.7	$	—		$	—		$	—		$	3,653.7
Fuel, purchased power and direct transmission expense		2,127.6		—			—			—			2,127.6
Other operation and maintenance		464.7		1.6			(3.2	)		—			463.1
Depreciation and amortization		416.0		—			—			—			416.0
Taxes other than income		99.3		0.2			3.3			—			102.8
Operating income (loss)		546.1		(1.8	)		(0.1	)		—			544.2
Equity in earnings of unconsolidated affiliates		—		169.8			—			—			169.8
Gain on Enable/Energy Transfer transaction, net		—		344.4			—			—			344.4
Other income (expense)		7.7		(26.4	)		(2.0	)		(0.9	)		(21.6	)
Interest expense		152.0		—			7.2			(0.9	)		158.3
Income tax expense (benefit)		41.8		101.0			(1.6	)		—			141.2
Net income (loss)	$	360.0	$	385.0		$	(7.7	)	$	—		$	737.3
Total assets	$	11,688.0	$	786.6		$	350.3		$	(218.5	)	$	12,606.4
Capital expenditures	$	778.5	$	—		$	—		$	—		$	778.5

Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Stock-Based Compensation [Abstract]

Schedule of Pre-tax Compensation Expense and Related Income Tax Benefit

The following table presents the Registrants' pre-tax compensation expense and related income tax benefit for the years ended December 31, 2023, 2022 and 2021 related to performance units and restricted stock units for the Registrants' employees.


	OGE Energy						OG&E
Year Ended December 31 (In millions)	2023		2022		2021		2023		2022		2021
Performance units	$	9.3	$	7.2	$	7.5	$	2.2	$	2.2	$	1.8
Restricted stock units		3.8		2.5		2.3		0.9		0.7		0.4
Total compensation expense	$	13.1	$	9.7	$	9.8	$	3.1	$	2.9	$	2.2
Income tax benefit	$	3.2	$	2.3	$	2.5	$	0.7	$	0.7	$	0.6

Schedule of Performance Units Granted and Assumptions Used to Calculate Grant Date Fair Value of Performance Units

The following table presents the number of performance units granted and the assumptions used to calculate the grant date fair value of the performance units.


	OGE Energy									OG&E
	2023			2022			2021			2023			2022			2021
Number of units granted		213,442			216,437			249,909			65,069			60,923			68,720
Fair value of units granted	$	43.74		$	41.10		$	38.14		$	43.74		$	41.10		$	38.14
Expected dividend yield		4.2	%		4.8	%		4.7	%		4.2	%		4.8	%		4.7	%
Expected price volatility		31.0	%		29.0	%		29.0	%		31.0	%		29.0	%		29.0	%
Risk-free interest rate		4.47	%		1.71	%		0.22	%		4.47	%		1.71	%		0.22	%
Expected life of units (in years)		2.85			2.85			2.84			2.85			2.85			2.85

Schedule of Restricted Stock Units Granted and Grant Date Fair Value

The following table presents the number of restricted stock units granted and the grant date fair value.


	OGE Energy						OG&E
	2023		2022		2021		2023		2022		2021
Restricted stock units granted		114,926		116,539		89,197		35,034		32,804		22,911
Fair value of restricted stock units granted	$	37.52	$	35.72	$	31.11	$	37.52	$	35.72	$	30.91

Schedule of Activity for Performance Units and Restricted Stock Units

The following tables present a summary of the activity for the Registrants' performance units and restricted stock units for the year ended December 31, 2023. The table designated as "OGE Energy" below includes the OG&E standalone activity, as OGE Energy represents consolidated results.


OGE Energy	Performance Units						Restricted Stock Units
(Dollars in millions)	Number of Units				Aggregate Intrinsic Value		Number of Shares			Aggregate Intrinsic Value
Units/shares outstanding at 12/31/22		608,375						189,483
Granted		213,442		(A)				114,926
Converted		(161,690	)	(B)	$	3.7	N/A
Vested	N/A							(76,664	)	$	2.7
Forfeited		(8,009	)					(4,599	)
Units/shares outstanding at 12/31/23		652,118			$	28.8		223,146		$	7.8
Units/shares fully vested at 12/31/23		234,672		(C)	$	12.7	N/A			N/A


OG&E	Performance Units						Restricted Stock Units
(Dollars in millions)	Number of Units				Aggregate Intrinsic Value		Number of Shares				Aggregate Intrinsic Value
Units/shares outstanding at 12/31/22		170,623						52,759
Granted		65,069		(A)				35,034
Converted		(44,550	)	(B)	$	1.0	N/A
Vested	N/A							(20,265	)		$	0.7
Forfeited		(5,889	)					(2,725	)
Employee migration		(1,416	)	(D)				(559	)	(D)
Units/shares outstanding at 12/31/23		183,837			$	8.0		64,244			$	2.2
Units/shares fully vested at 12/31/23		63,506		(C)	$	3.4	N/A				N/A

(A)

For performance units, this represents the target number of performance units granted. Actual number of performance units earned, if any, is dependent upon performance and may range from zero percent to 200 percent of the target.

(B)

These amounts represent performance units that vested at December 31, 2022, which were settled in February 2023.

(C)

These amounts represent performance units that vested at December 31, 2023. Actual expected amounts to be paid out in 2024 will differ based on the percentage at which the performance metric was met and are dependent upon Compensation Committee approval.

(D)

Due to certain employees transferring between OG&E and OGE Energy.

Summary of Activity for Non-vested Performance Units and Restricted Stock Units

The following tables present a summary of the activity for the Registrants' non-vested performance units and restricted stock units for the year ended December 31, 2023. The table designated as "OGE Energy" below includes the OG&E standalone activity, as OGE Energy represents consolidated results.


OGE Energy	Performance Units						Restricted Stock Units
	Number of Units				Weighted-Average Grant Date Fair Value		Number of Shares			Weighted-Average Grant Date Fair Value
Units/shares non-vested at 12/31/22		446,685			$	39.53		189,483		$	33.75
Granted		213,442		(A)	$	43.74		114,926		$	37.52
Vested		(234,672	)		$	38.14		(76,664	)	$	30.95
Forfeited		(8,009	)		$	40.66		(4,599	)	$	34.52
Units/shares non-vested at 12/31/23		417,446			$	42.44		223,146		$	36.64


OG&E	Performance Units						Restricted Stock Units
	Number of Units				Weighted-Average Grant Date Fair Value		Number of Shares				Weighted-Average Grant Date Fair Value
Units/shares non-vested at 12/31/22		126,073			$	39.53		52,759			$	33.78
Granted		65,069		(A)	$	43.74		35,034			$	37.52
Vested		(63,506	)		$	38.14		(20,265	)		$	30.91
Forfeited		(5,889	)		$	40.92		(2,725	)		$	35.17
Employee migration		(1,416	)	(B)	$	38.36		(559	)	(B)	$	32.25
Units/shares non-vested at 12/31/23		120,331			$	42.49		64,244			$	36.68

(A)

(B)

Due to certain employees transferring between OG&E and OGE Energy.

Summary of Fair Value for Vested Performance Units and Restricted Stock Units

The following table presents a summary of the Registrants' fair value for vested performance units and restricted stock units.


	OGE Energy						OG&E
Year Ended December 31 (In millions)	2023		2022		2021		2023		2022		2021
Performance units	$	9.0	$	6.2	$	8.1	$	2.4	$	1.7	$	2.3
Restricted stock units	$	2.4	$	2.1	$	2.2	$	0.6	$	0.5	$	0.5

Summary of Unrecognized Compensation Cost and Weighted-average Periods Over which Compensation Cost is Expected to be Recognized

The following table presents a summary of the Registrants' unrecognized compensation cost for non-vested performance units and restricted stock units and the weighted-average periods over which the compensation cost is expected to be recognized.


	OGE Energy				OG&E
December 31, 2023	Unrecognized Compensation Cost (In millions)		Weighted Average to be Recognized (In years)		Unrecognized Compensation Cost (In millions)		Weighted Average to be Recognized (In years)
Performance units	$	8.3		1.68	$	2.4		1.70
Restricted stock units		3.6		1.67		1.1		1.69
Total unrecognized compensation cost	$	11.9			$	3.5

Rate Matters and Regulation - Additional Information (Details)									12 Months Ended
	Jan. 30, 2024 USD ($)	Dec. 29, 2023 USD ($)	Dec. 28, 2023 USD ($)	Nov. 21, 2023 USD ($)	Oct. 02, 2023 USD ($)	Jul. 12, 2023 USD ($) Megawattsday Turbine	May 31, 2023 USD ($) Megawattsday Turbine	Feb. 01, 2023 USD ($)	Dec. 31, 2023 USD ($)	Nov. 01, 2023 USD ($)	Dec. 31, 2022 USD ($)
Estimated Refund to SPP									$ 13,000,000
Regulatory assets									577,600,000		$ 524,300,000
Requested Recovery of Capital Investment									1,300,000,000
Settlement Agreement [Member]
Approximate deduction in average monthly residential bill expected										$ 21
Impact to Company [Member]
Estimated Refund to SPP									5,000,000
Customer Impact [Member]
Estimated Refund to SPP									$ 8,000,000
Oklahoma Corporation Commission [Member]
OG&E's Jurisdictional Revenues									86.00%
Arkansas Public Service Commission [Member]
OG&E's Jurisdictional Revenues									8.00%
Increase (decrease) in revenue requirement rose amount	$ 3,500,000		$ 3,500,000
Federal Energy Regulatory Commission [Member]
OG&E's Jurisdictional Revenues									6.00%
OKLAHOMA
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 332,500,000
Public Utilities, Requested Return on Equity, Percentage		10.50%
Common Equity Percentage which ROE is based		53.50%
ARKANSAS
Public Utilities, Approved Rate Increase (Decrease), Amount					$ 4,700,000			$ 9,600,000
Horseshoe Lake [Member]
Number of hydrogen capable combustion turbines \| Turbine						2	2
Current energy generation capacity \| Megawattsday						448	448
Approximate construction cost of turbines excluding financing costs and property taxes						$ 331,000,000	$ 331,000,000
Recovery of jurisdictional portion of expenses plus financing costs and property taxes				$ 275,000,000
Winter Storm Uri Costs [Member] \| ARKANSAS
Regulatory assets									$ 71,000,000		$ 78,200,000

Stock-Based Compensation - Schedule of Nonvested Share Activity (Details) - $ / shares

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Instruments Other than Options, Forfeited in Period

(8,009)

Performance Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Instruments Other than Options, Nonvested, Number, Beginning Balance

446,685

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted

^[1]

213,442

Equity Instruments Other than Options, Vested in Period

(234,672)

Equity Instruments Other than Options, Forfeited in Period

(8,009)

Equity Instruments Other than Options, Nonvested, Number, Ending Balance

417,446

446,685

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance

$ 39.53

Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value

43.74

Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value

38.14

Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value

40.66

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance

$ 42.44

$ 39.53

Performance Units [Member] | Og and E [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Instruments Other than Options, Nonvested, Number, Beginning Balance

126,073

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted

^[1]

65,069

Equity Instruments Other than Options, Vested in Period

(63,506)

Equity Instruments Other than Options, Forfeited in Period

(5,889)

Equity Other Than Options, Employee Migration

^[2]

(1,416)

Equity Instruments Other than Options, Nonvested, Number, Ending Balance

120,331

126,073

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance

$ 39.53

Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value

43.74

Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value

38.14

Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value

40.92

Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value

38.36

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance

$ 42.49

$ 39.53

Restricted Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Instruments Other than Options, Nonvested, Number, Beginning Balance

189,483

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted

114,926

116,539

89,197

Equity Instruments Other than Options, Vested in Period

(76,664)

Equity Instruments Other than Options, Forfeited in Period

(4,599)

Equity Instruments Other than Options, Nonvested, Number, Ending Balance

223,146

189,483

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance

$ 33.75

Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value

37.52

$ 35.72

$ 31.11

Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value

30.95

Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value

34.52

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance

$ 36.64

$ 33.75

Restricted Stock [Member] | Og and E [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Instruments Other than Options, Nonvested, Number, Beginning Balance

52,759

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted

35,034

32,804

22,911

Equity Instruments Other than Options, Vested in Period

(20,265)

Equity Instruments Other than Options, Forfeited in Period

(2,725)

Equity Other Than Options, Employee Migration

^[2]

(559)

Equity Instruments Other than Options, Nonvested, Number, Ending Balance

64,244

52,759

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance

$ 33.78

Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value

37.52

$ 35.72

$ 30.91

Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value

30.91

Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value

35.17

Equity Other Than Options, Employee Migration, Weighted Average Grant Date Fair Value

32.25

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance

$ 36.68

$ 33.78

[1]	For performance units, this represents the target number of performance units granted. Actual number of performance units earned, if any, is dependent upon performance and may range from zero percent to 200 percent of the target.
[2]	Due to certain employees transferring between OG&E and OGE Energy.

Income Taxes - Summary of Tax Credit Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
State tax credits	$ (228.8)	$ (221.2)
Og and E [Member]
Income Taxes [Line Items]
State tax credits	(213.5)	$ (208.5)
Oklahoma investment tax credits [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	259.1
State tax credits	204.7
Oklahoma investment tax credits [Member] \| Og and E [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	239.8
State tax credits	189.4
Oklahoma capital investment board credits [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	12.8
State tax credits	12.8
Oklahoma capital investment board credits [Member] \| Og and E [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	12.8
State tax credits	12.8
Oklahoma zero emission tax credits [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	16.0
State tax credits	11.3
Oklahoma zero emission tax credits [Member] \| Og and E [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	16.0
State tax credits	$ 11.3

Investment in Unconsolidated Affiliate (Details) - USD ($) $ / shares in Units, $ in Millions		11 Months Ended	12 Months Ended
	Dec. 02, 2021	Dec. 02, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2023
Schedule of Equity Method Investments [Line Items]
Distributions received				$ 34.0	$ 73.4
Equity in earnings (losses) of unconsolidated affiliates		$ 169.8	$ 0.0	0.0	169.8
Share Price						$ 35.91
Gain (Loss) on Disposition of Assets			$ 0.0	$ 0.0	$ 344.4
Proceeds from Sales of Assets, Investing Activities	$ 35.0
Fees paid from disposition of assets	8.6
OGE Energy [Member]
Schedule of Equity Method Investments [Line Items]
Gain (Loss) on Disposition of Assets	344.4
CenterPoint [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from Sales of Assets, Investing Activities	30.0
Energy Transfer
Schedule of Equity Method Investments [Line Items]
Proceeds from Sales of Assets, Investing Activities	$ 5.0

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 1.6646	$ 1.6482	$ 1.625

Retirement Plans and Postretirement Benefit Plans - Projected Benefit Obligation Funded Status Thresholds (Details)	12 Months Ended
	Dec. 31, 2023
Less Than 90% [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation Funded Status Thresholds Fixed Income	50.00%
Projected Benefit Obligation Funded Status Thresholds Equity	50.00%
Projected Benefit Obligation Funded Status Thresholds	100.00%
95% [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation Funded Status Thresholds Fixed Income	58.00%
Projected Benefit Obligation Funded Status Thresholds Equity	42.00%
Projected Benefit Obligation Funded Status Thresholds	100.00%
100% [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation Funded Status Thresholds Fixed Income	65.00%
Projected Benefit Obligation Funded Status Thresholds Equity	35.00%
Projected Benefit Obligation Funded Status Thresholds	100.00%
105% [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation Funded Status Thresholds Fixed Income	73.00%
Projected Benefit Obligation Funded Status Thresholds Equity	27.00%
Projected Benefit Obligation Funded Status Thresholds	100.00%
110% [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation Funded Status Thresholds Fixed Income	80.00%
Projected Benefit Obligation Funded Status Thresholds Equity	20.00%
Projected Benefit Obligation Funded Status Thresholds	100.00%
115% [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation Funded Status Thresholds Fixed Income	85.00%
Projected Benefit Obligation Funded Status Thresholds Equity	15.00%
Projected Benefit Obligation Funded Status Thresholds	100.00%
120% [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation Funded Status Thresholds Fixed Income	90.00%
Projected Benefit Obligation Funded Status Thresholds Equity	10.00%
Projected Benefit Obligation Funded Status Thresholds	100.00%
Domestic All-Cap/Large Cap Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	40.00%
Domestic All-Cap/Large Cap Equity [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	35.00%
Domestic All-Cap/Large Cap Equity [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	60.00%
Domestic Mid-Cap Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	15.00%
Domestic Mid-Cap Equity [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	5.00%
Domestic Mid-Cap Equity [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	25.00%
Domestic Small-Cap Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	25.00%
Domestic Small-Cap Equity [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	5.00%
Domestic Small-Cap Equity [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	30.00%
International Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	20.00%
International Equity [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10.00%
International Equity [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	30.00%

Long-Term Debt - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term Debt	$ 4,340.5	$ 4,548.6
Garfield Industrial Authority Bond [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Jan. 01, 2025
Muskogee Industrial Authority Bond Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Jan. 01, 2025
Muskogee Industrial Authority Bond Due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Jun. 01, 2027
Redeemable during the next 12 months
Debt Instrument [Line Items]
Long-term Debt	$ 135.4
OG&E [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 4,290.6	3,998.9
OG&E [Member] \| Garfield Industrial Authority Bond [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Jan. 01, 2025
OG&E [Member] \| Muskogee Industrial Authority Bond Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Jan. 01, 2025
OG&E [Member] \| Muskogee Industrial Authority Bond Due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Jun. 01, 2027
OG&E [Member] \| Redeemable during the next 12 months \| Garfield Industrial Authority Bond [Member]
Debt Instrument [Line Items]
Long term debt	$ 47.0	47.0
OG&E [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority Bond Due 2025 [Member]
Debt Instrument [Line Items]
Long term debt	32.4	32.4
OG&E [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority Bond Due 2027 [Member]
Debt Instrument [Line Items]
Long term debt	$ 56.0	$ 56.0
Minimum [Member] \| Redeemable during the next 12 months \| Garfield Industrial Authority Bond [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.85%
Minimum [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority Bond Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.85%
Minimum [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority Bond Due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.85%
Minimum [Member] \| OG&E [Member] \| Redeemable during the next 12 months \| Garfield Industrial Authority Bond [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.85%
Minimum [Member] \| OG&E [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority Bond Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.85%
Minimum [Member] \| OG&E [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority Bond Due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.85%
Maximum [Member] \| Redeemable during the next 12 months \| Garfield Industrial Authority Bond [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Maximum [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority Bond Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.60%
Maximum [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority Bond Due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Maximum [Member] \| OG&E [Member] \| Redeemable during the next 12 months \| Garfield Industrial Authority Bond [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Maximum [Member] \| OG&E [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority Bond Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.60%
Maximum [Member] \| OG&E [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority Bond Due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%

Stock Based Compensation

12 Months Ended

Dec. 31, 2023

Stock-Based Compensation [Abstract]

Stock-Based Compensation

6. Stock-Based Compensation

In 2022, OGE Energy adopted, and its shareholders approved, the 2022 Stock Incentive Plan. The 2022 Stock Incentive Plan replaced the 2013 Stock Incentive Plan, and no further awards will be granted under the 2013 Stock Incentive Plan. Under the 2022 Stock Incentive Plan, restricted stock, restricted stock units, stock options, stock appreciation rights and performance units may be

granted to officers, directors and other key employees of OGE Energy and its subsidiaries, including OG&E. OGE Energy has authorized the issuance of up to 8,417,755 shares under the 2022 Stock Incentive Plan.


	OGE Energy						OG&E
Year Ended December 31 (In millions)	2023		2022		2021		2023		2022		2021
Performance units	$	9.3	$	7.2	$	7.5	$	2.2	$	2.2	$	1.8
Restricted stock units		3.8		2.5		2.3		0.9		0.7		0.4
Total compensation expense	$	13.1	$	9.7	$	9.8	$	3.1	$	2.9	$	2.2
Income tax benefit	$	3.2	$	2.3	$	2.5	$	0.7	$	0.7	$	0.6

During the year ended December 31, 2021, 154,523 shares of treasury stock were used to satisfy payouts of earned performance units and restricted stock unit grants to the Registrants' employees pursuant to OGE Energy's 2013 Stock Incentive Plan.

During the year ended December 31, 2022, OGE Energy issued 27,278 shares of new common stock pursuant to OGE Energy's 2013 Stock Incentive Plan and issued an immaterial amount of treasury stock to satisfy payouts of restricted stock unit grants to the Registrants' employees.

During the year ended December 31, 2023, OGE Energy issued 82,321 shares of new common stock pursuant to OGE Energy's 2013 Stock Incentive Plan and issued 2,371 shares of treasury stock to satisfy payouts of earned performance units and restricted stock unit grants to the Registrants' employees.

Performance Units

Under the Stock Incentive Plan, OGE Energy has issued performance units which represent the value of one share of OGE Energy's common stock. The performance units provide for accelerated vesting if there is a change in control (as defined in the Stock Incentive Plan). Each performance unit is subject to forfeiture if the recipient terminates employment with OGE Energy or a subsidiary prior to the end of the primarily three-year award cycle for any reason other than death, disability or retirement. In the event of death, disability or retirement, a participant will receive a prorated payment based on such participant's number of full months of service during the award cycle, further adjusted based on the achievement of the performance goals during the award cycle. The Registrants estimate expected forfeitures in accounting for performance unit compensation expense.

The performance units granted are contingently awarded and will be payable in shares of OGE Energy's common stock subject to the condition that the number of performance units, if any, earned by the employees upon the expiration of a primarily three-year award cycle (i.e., three-year cliff vesting period) is dependent on OGE Energy's total shareholder return ranking relative to a peer group of companies. These performance units are classified as equity in the balance sheets. If there is no or only a partial payout for the performance units at the end of the award cycle, the unearned performance units are cancelled. Payout requires approval of the Compensation Committee of OGE Energy's Board of Directors. Payouts, if any, are all made in common stock and are considered made when the payout is approved by the Compensation Committee.

The fair value of the performance units was estimated on the grant date using a lattice-based valuation model that factors in information, including the expected dividend yield, expected price volatility, risk-free interest rate and the probable outcome of the market condition, over the expected life of the performance units. Compensation expense for the performance units is a fixed amount determined at the grant date fair value and is recognized over the primarily three-year award cycle regardless of whether performance units are awarded at the end of the award cycle. Dividends are accrued on a quarterly basis pending achievement of payout criteria and are included in the fair value calculations. Expected price volatility is based on the historical volatility of OGE Energy's common stock for the past three years and is simulated using the Geometric Brownian Motion process. The risk-free interest rate for the performance unit grants is based on the three-year U.S. Treasury yield curve in effect at the time of the grant. The expected life of the units is based on the non-vested period since inception of the award cycle. There are no post-vesting restrictions related to OGE Energy's performance units. The following table presents the number of performance units granted and the assumptions used to calculate the grant date fair value of the performance units.


	OGE Energy									OG&E
	2023			2022			2021			2023			2022			2021
Number of units granted		213,442			216,437			249,909			65,069			60,923			68,720
Fair value of units granted	$	43.74		$	41.10		$	38.14		$	43.74		$	41.10		$	38.14
Expected dividend yield		4.2	%		4.8	%		4.7	%		4.2	%		4.8	%		4.7	%
Expected price volatility		31.0	%		29.0	%		29.0	%		31.0	%		29.0	%		29.0	%
Risk-free interest rate		4.47	%		1.71	%		0.22	%		4.47	%		1.71	%		0.22	%
Expected life of units (in years)		2.85			2.85			2.84			2.85			2.85			2.85

Restricted Stock Units

Under the Stock Incentive Plan, OGE Energy has issued restricted stock units to certain existing non-officer employees as well as other executives upon hire to attract and retain individuals to be competitive in the marketplace. The restricted stock units vest primarily in a three-year award cycle (i.e., three-year cliff vesting period). Prior to vesting, each restricted stock unit is subject to forfeiture if the recipient ceases to render substantial services to OGE Energy or a subsidiary. These restricted stock units may not be sold, assigned, transferred or pledged and are subject to a risk of forfeiture.

The fair value of the restricted stock units was based on the closing market price of OGE Energy's common stock on the grant date. Compensation expense for the restricted stock units is a fixed amount determined at the grant date fair value and is recognized as services are rendered by employees over a primarily three-year vesting period. Also, for those restricted stock units that vest in one-third annual increments over a three-year cycle, OGE Energy treats its restricted stock units as multiple separate awards by recording compensation expense separately for each tranche whereby a substantial portion of the expense is recognized in the earlier years in the requisite service period.

Dividends will only be paid on restricted stock unit awards that vest; therefore, only the present value of dividends expected to vest are included in the fair value calculations. The expected life of the restricted stock units is based on the non-vested period since inception of the primarily three-year award cycle. There are no post-vesting restrictions related to OGE Energy's restricted stock units. The following table presents the number of restricted stock units granted and the grant date fair value.


	OGE Energy						OG&E
	2023		2022		2021		2023		2022		2021
Restricted stock units granted		114,926		116,539		89,197		35,034		32,804		22,911
Fair value of restricted stock units granted	$	37.52	$	35.72	$	31.11	$	37.52	$	35.72	$	30.91

Performance Units and Restricted Stock Units Activity


OGE Energy	Performance Units						Restricted Stock Units
(Dollars in millions)	Number of Units				Aggregate Intrinsic Value		Number of Shares			Aggregate Intrinsic Value
Units/shares outstanding at 12/31/22		608,375						189,483
Granted		213,442		(A)				114,926
Converted		(161,690	)	(B)	$	3.7	N/A
Vested	N/A							(76,664	)	$	2.7
Forfeited		(8,009	)					(4,599	)
Units/shares outstanding at 12/31/23		652,118			$	28.8		223,146		$	7.8
Units/shares fully vested at 12/31/23		234,672		(C)	$	12.7	N/A			N/A


OG&E	Performance Units						Restricted Stock Units
(Dollars in millions)	Number of Units				Aggregate Intrinsic Value		Number of Shares				Aggregate Intrinsic Value
Units/shares outstanding at 12/31/22		170,623						52,759
Granted		65,069		(A)				35,034
Converted		(44,550	)	(B)	$	1.0	N/A
Vested	N/A							(20,265	)		$	0.7
Forfeited		(5,889	)					(2,725	)
Employee migration		(1,416	)	(D)				(559	)	(D)
Units/shares outstanding at 12/31/23		183,837			$	8.0		64,244			$	2.2
Units/shares fully vested at 12/31/23		63,506		(C)	$	3.4	N/A				N/A

(A)

(B)

These amounts represent performance units that vested at December 31, 2022, which were settled in February 2023.

(C)

(D)

Due to certain employees transferring between OG&E and OGE Energy.


OGE Energy	Performance Units						Restricted Stock Units
	Number of Units				Weighted-Average Grant Date Fair Value		Number of Shares			Weighted-Average Grant Date Fair Value
Units/shares non-vested at 12/31/22		446,685			$	39.53		189,483		$	33.75
Granted		213,442		(A)	$	43.74		114,926		$	37.52
Vested		(234,672	)		$	38.14		(76,664	)	$	30.95
Forfeited		(8,009	)		$	40.66		(4,599	)	$	34.52
Units/shares non-vested at 12/31/23		417,446			$	42.44		223,146		$	36.64


OG&E	Performance Units						Restricted Stock Units
	Number of Units				Weighted-Average Grant Date Fair Value		Number of Shares				Weighted-Average Grant Date Fair Value
Units/shares non-vested at 12/31/22		126,073			$	39.53		52,759			$	33.78
Granted		65,069		(A)	$	43.74		35,034			$	37.52
Vested		(63,506	)		$	38.14		(20,265	)		$	30.91
Forfeited		(5,889	)		$	40.92		(2,725	)		$	35.17
Employee migration		(1,416	)	(B)	$	38.36		(559	)	(B)	$	32.25
Units/shares non-vested at 12/31/23		120,331			$	42.49		64,244			$	36.68

(A)

(B)

Due to certain employees transferring between OG&E and OGE Energy.

Fair Value of Vested Performance Units and Restricted Stock Units

The following table presents a summary of the Registrants' fair value for vested performance units and restricted stock units.


	OGE Energy						OG&E
Year Ended December 31 (In millions)	2023		2022		2021		2023		2022		2021
Performance units	$	9.0	$	6.2	$	8.1	$	2.4	$	1.7	$	2.3
Restricted stock units	$	2.4	$	2.1	$	2.2	$	0.6	$	0.5	$	0.5

Unrecognized Compensation Cost


	OGE Energy				OG&E
December 31, 2023	Unrecognized Compensation Cost (In millions)		Weighted Average to be Recognized (In years)		Unrecognized Compensation Cost (In millions)		Weighted Average to be Recognized (In years)
Performance units	$	8.3		1.68	$	2.4		1.70
Restricted stock units		3.6		1.67		1.1		1.69
Total unrecognized compensation cost	$	11.9			$	3.5

Retirement Plans and Postretirement Benefit Plans - Schedule of Allocation of Plan Assets (Details) - Other Postretirement Benefits Plan [Member] - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	$ 32.7	$ 32.8	$ 44.3
Og and E [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	29.6	29.8	$ 39.9
Group Retiree Medical Insurance Contract [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	16.8	21.6
Mutual fund [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	15.9	11.2
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	15.9	11.2
Fair Value, Inputs, Level 1 [Member] \| Group Retiree Medical Insurance Contract [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	0.0	0.0
Fair Value, Inputs, Level 1 [Member] \| Mutual fund [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	15.9	11.2
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	16.8	21.6
Fair Value, Inputs, Level 3 [Member] \| Group Retiree Medical Insurance Contract [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	16.8	21.6
Fair Value, Inputs, Level 3 [Member] \| Mutual fund [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	0.0	0.0
Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	32.7	32.8
Fair Value, Inputs, Level 1, 2 and 3 [Member] \| OGE Energy [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	(3.1)	(3.0)
Fair Value, Inputs, Level 1, 2 and 3 [Member] \| Og and E [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	$ 29.6	$ 29.8

Common Equity

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Common Equity

8. Common Equity

OGE Energy

Automatic Dividend Reinvestment and Stock Purchase Plan

OGE Energy issued no new shares of common stock under its Automatic Dividend Reinvestment and Stock Purchase Plan in 2023. Under the terms of the Automatic Dividend Reinvestment and Stock Purchase Plan, OGE Energy may, from time to time, issue new shares to satisfy purchases under the plan or have shares purchased on the open market. At December 31, 2023, there were 4,899,178 shares of unissued common stock reserved for issuance under OGE Energy's Automatic Dividend Reinvestment and Stock Purchase Plan.

Earnings Per Share

Basic earnings per share is calculated by dividing net income attributable to OGE Energy by the weighted-average number of OGE Energy's common shares outstanding during the period. In the calculation of diluted earnings per share, weighted-average shares outstanding are increased for additional shares that would be outstanding if potentially dilutive securities were converted to common stock. Potentially dilutive securities for OGE Energy consist of performance units and restricted stock units. The following table presents the calculation of basic and diluted earnings per share for OGE Energy.


(In millions except per share data)	2023		2022		2021
Net income	$	416.8	$	665.7	$	737.3
Average common shares outstanding:
Basic average common shares outstanding		200.3		200.2		200.1
Effect of dilutive securities:
Contingently issuable shares (performance and restricted stock units)		0.6		0.6		0.2
Diluted average common shares outstanding		200.9		200.8		200.3
Basic earnings per average common share	$	2.08	$	3.33	$	3.68
Diluted earnings per average common share	$	2.07	$	3.32	$	3.68
Anti-dilutive shares excluded from earnings per share calculation		—		—		—

Dividend Restrictions

OGE Energy's Certificate of Incorporation places restrictions on the amount of common stock dividends it can pay when preferred stock is outstanding. Before OGE Energy can pay any dividends on its common stock, the holders of any of its preferred stock that may be outstanding are entitled to receive their dividends at the respective rates as may be provided for the shares of their series. As there is no preferred stock outstanding, that restriction did not place any effective limit on OGE Energy's ability to pay dividends to its shareholders. OGE Energy utilizes dividends from OG&E to pay dividends to its shareholders.

Pursuant to the leverage restriction in OGE Energy's revolving credit agreement, OGE Energy must maintain a percentage of debt to total capitalization at a level that does not exceed 70 percent. The payment of cash dividends indirectly results in an increase in the percentage of debt to total capitalization, which results in the restriction of approximately $930.9 million of OGE Energy's retained earnings from being paid out in dividends. Accordingly, approximately $2.4 billion of OGE Energy's retained earnings as of December 31, 2023 are unrestricted for the payment of dividends.

OG&E

There were no new shares of OG&E common stock issued in 2023, 2022 or 2021.

Dividend Restrictions

Pursuant to the Federal Power Act, OG&E is restricted from paying dividends from its capital accounts. Dividends are paid from retained earnings. Pursuant to the leverage restriction in OG&E's revolving credit agreement, OG&E must maintain a percentage of debt to total capitalization at a level that does not exceed 65 percent. The payment of cash dividends indirectly results in an increase in the percentage of debt to total capitalization, which results in the restriction of approximately $733.3 million of OG&E's retained earnings from being paid out in dividends. Accordingly, approximately $2.7 billion of OG&E's retained earnings as of December 31, 2023 are unrestricted for the payment of dividends.

Short-Term Debt and Credit Facilities - Schedule of Line of Credit Facilities (Parenthetical) (Details)

12 Months Ended

Dec. 31, 2023

USD ($)

Dec. 31, 2022

USD ($)

Line of Credit Facility [Line Items]

Outstanding Intercompany Borrowings

$ 85,100,000

Line of Credit Facility, Maximum Borrowing Capacity

1,150,000,000

Og and E [Member]

Line of Credit Facility [Line Items]

Intercompany Borrowing Agreement - Maximum Borrowing Capacity

$ 450,000,000

Credit facility termination date

^[1],[2],[3]

Dec. 18, 2028

Line of Credit Facility, Current Borrowing Capacity

^[2],[3]

$ 550,000,000

Advances from parent

$ 147,700,000

$ 0

OGE Energy [Member]

Line of Credit Facility [Line Items]

Credit facility termination date

^[1],[4]

Dec. 18, 2028

Line of Credit Facility, Current Borrowing Capacity

^[4]

$ 550,000,000

OGE Energy [Member] | Series Due May 24, 2025 [Member]

Line of Credit Facility [Line Items]

Long term debt

100,000,000

OGE Energy [Member] | Series due August 15, 2028 [Member]

Line of Credit Facility [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

$ 135,000,000

Debt Instrument Maximum Leverage Ratio

0.65

Credit Facility [Member] | OGE Energy [Member] | Series Due May 24, 2025 [Member]

Line of Credit Facility [Line Items]

Long term debt

$ 50,000,000

Term Loan [Member] | OGE Energy [Member]

Line of Credit Facility [Line Items]

Credit facility termination date

^[5]

May 24, 2025

Line of Credit Facility, Current Borrowing Capacity

^[5]

$ 50,000,000

Term Loan [Member] | OGE Energy [Member] | Series Due May 24, 2025 [Member]

Line of Credit Facility [Line Items]

Long term debt

$ 50,000,000

[1]	In December 2022, the Registrants entered into an amendment to their credit facility that gave each of the Registrants the option of extending such commitments for up to two additional one-year periods. On December 18, 2023, the Registrants utilized the first extension option for an additional one-year period extending the term until December 2028.
[2]	OG&E has an intercompany borrowing agreement with OGE Energy whereby OG&E has access to up to $450.0 million of OGE Energy's revolving credit amount. This agreement has a termination date of December 18, 2028. At December 31, 2023, there was $85.1 million in intercompany borrowings under this agreement.
[3]	This bank facility is available to back up OG&E's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.
[4]	This bank facility is available to back up OGE Energy's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.
[5]	OGE Energy has a $100.0 million floating rate unsecured three-year credit agreement, of which $50.0 million is considered a revolving loan and $50.0 million is considered a term loan. The credit agreement, under certain circumstances, may be increased to a maximum commitment limit of $135.0 million and includes a maximum leverage ratio of 0.65 to 1.0. The other covenants under this credit agreement are substantially the same as OGE Energy's existing $550.0 million revolving credit agreement.

Stock-Based Compensation - Restricted Stock Valuation Assumptions (Details) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	114,926	116,539	89,197
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 37.52	$ 35.72	$ 31.11
Og and E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	35,034	32,804	22,911
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 37.52	$ 35.72	$ 30.91

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Stock-Based Compensation - Schedule of Unrecognized Compensation Cost, Nonvested Awards (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Compensation Cost Not yet Recognized	$ 11.9
Og and E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Compensation Cost Not yet Recognized	3.5
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Compensation Cost Not yet Recognized	$ 8.3
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 8 months 4 days
Performance Units [Member] \| Og and E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Compensation Cost Not yet Recognized	$ 2.4
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 8 months 12 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Compensation Cost Not yet Recognized	$ 3.6
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 8 months 1 day
Restricted Stock [Member] \| Og and E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Compensation Cost Not yet Recognized	$ 1.1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 8 months 8 days

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Short-Term Debt and Credit Facilities (Tables)

12 Months Ended

Dec. 31, 2023

Short-Term Debt [Abstract]

Schedule of Line of Credit Facilities

The following table presents information regarding the Registrants' revolving credit agreements at December 31, 2023.


Entity	Aggregate Commitment		Amount Outstanding (A)		Weighted-Average Interest Rate				Expiration
	(In millions)
OGE Energy (B)	$	550.0	$	499.2		5.78	%	(F)	December 18, 2028 (G)
OGE Energy (C)		50.0		—		—		(F)	May 24, 2025
OG&E (D)(E)		550.0		0.4		1.20	%	(F)	December 18, 2028 (G)
Total	$	1,150.0	$	499.6		5.77	%

(A)

Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at December 31, 2023.

(B)

This bank facility is available to back up OGE Energy's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.

(C)

(D)

This bank facility is available to back up OG&E's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.

(E)

(F)

Represents the weighted-average interest rate for the outstanding borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit.

(G)

CONSOLIDATED STATEMENTS OF CAPITALIZATION (Parenthetical) - $ / shares shares in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Schedule of Capitalization, Long-Term Debt [Line Items]
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	450.0	450.0
Common Stock, Shares, Outstanding	200.3	200.2
Treasury Stock, Common, Shares	0.0	0.0
Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Common Stock, Par or Stated Value Per Share	$ 2.5	$ 2.5
Common Stock, Shares Authorized	100.0	100.0
Common Stock, Shares, Outstanding	40.4	40.4
Garfield Industrial Authority Bond [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Maturity Date	Jan. 01, 2025
Garfield Industrial Authority Bond [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Maturity Date	Jan. 01, 2025
Muskogee Industrial Authority Bond Due 2025 [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Maturity Date	Jan. 01, 2025
Muskogee Industrial Authority Bond Due 2025 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Maturity Date	Jan. 01, 2025
Muskogee Industrial Authority Bond Due 2027 [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Maturity Date	Jun. 01, 2027
Muskogee Industrial Authority Bond Due 2027 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Maturity Date	Jun. 01, 2027
Senior Notes [Member] \| Series Due May 26, 2023 [Member] \| OGE Energy [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.703%
Debt Instrument, Maturity Date	May 26, 2023
Senior Notes [Member] \| Series Due May 26, 2023 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.553%
Debt Instrument, Maturity Date	May 26, 2023
Senior Notes [Member] \| Series Due July 15, 2027 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.65%
Debt Instrument, Maturity Date	Jul. 15, 2027
Senior Notes [Member] \| Series Due April 15, 2028 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Debt Instrument, Maturity Date	Apr. 15, 2028
Senior Notes [Member] \| Series due August 15, 2028 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.80%
Debt Instrument, Maturity Date	Aug. 15, 2028
Senior Notes [Member] \| Series Due March 15, 2030 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.30%
Debt Instrument, Maturity Date	Mar. 15, 2030
Senior Notes [Member] \| Series Due April 1, 2030 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Debt Instrument, Maturity Date	Apr. 01, 2030
Senior Notes [Member] \| Series Due January 15, 2033 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.40%
Debt Instrument, Maturity Date	Jan. 15, 2033
Senior Notes [Member] \| Series Due January 15, 2036 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.75%
Debt Instrument, Maturity Date	Jan. 15, 2036
Senior Notes [Member] \| Series Due February 1, 2038 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.45%
Debt Instrument, Maturity Date	Feb. 01, 2038
Senior Notes [Member] \| Series Due June 1, 2040 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.85%
Debt Instrument, Maturity Date	Jun. 01, 2040
Senior Notes [Member] \| Series Due May 15, 2041 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.25%
Debt Instrument, Maturity Date	May 15, 2041
Senior Notes [Member] \| Series due May 1, 2043 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.90%
Debt Instrument, Maturity Date	May 01, 2043
Senior Notes [Member] \| Series due March 15, 2044 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.55%
Debt Instrument, Maturity Date	Mar. 15, 2044
Senior Notes [Member] \| Series due December 15, 2044 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.00%
Debt Instrument, Maturity Date	Dec. 15, 2044
Senior Notes [Member] \| Series due April 1, 2047 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.15%
Debt Instrument, Maturity Date	Apr. 01, 2047
Senior Notes [Member] \| Series due August 15, 2047 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.85%
Debt Instrument, Maturity Date	Aug. 15, 2047
Senior Notes [Member] \| Series Due April 1, 2053 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.60%
Debt Instrument, Maturity Date	Apr. 01, 2053
Term Loan [Member] \| Due May 24, 2025 \| OGE Energy [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Maturity Date	May 24, 2025
Term Loan [Member] \| Due May 24, 2025 \| OGE Energy [Member] \| Minimum [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.375%
Term Loan [Member] \| Due May 24, 2025 \| OGE Energy [Member] \| Maximum [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.375%
Long-term Debt [Member] \| Due August 31, 2062 [Member] \| Og and E [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.80%
Debt Instrument, Maturity Date	Aug. 31, 2062
Debentures Subject to Mandatory Redemption [Member] \| Garfield Industrial Authority Bond [Member] \| Minimum [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.85%
Debentures Subject to Mandatory Redemption [Member] \| Garfield Industrial Authority Bond [Member] \| Maximum [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Debentures Subject to Mandatory Redemption [Member] \| Garfield Industrial Authority Bond [Member] \| Og and E [Member] \| Minimum [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.85%
Debentures Subject to Mandatory Redemption [Member] \| Garfield Industrial Authority Bond [Member] \| Og and E [Member] \| Maximum [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Debentures Subject to Mandatory Redemption [Member] \| Muskogee Industrial Authority Bond Due 2025 [Member] \| Minimum [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.85%
Debentures Subject to Mandatory Redemption [Member] \| Muskogee Industrial Authority Bond Due 2025 [Member] \| Maximum [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.60%
Debentures Subject to Mandatory Redemption [Member] \| Muskogee Industrial Authority Bond Due 2025 [Member] \| Og and E [Member] \| Minimum [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.85%
Debentures Subject to Mandatory Redemption [Member] \| Muskogee Industrial Authority Bond Due 2025 [Member] \| Og and E [Member] \| Maximum [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.60%
Debentures Subject to Mandatory Redemption [Member] \| Muskogee Industrial Authority Bond Due 2027 [Member] \| Minimum [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.85%
Debentures Subject to Mandatory Redemption [Member] \| Muskogee Industrial Authority Bond Due 2027 [Member] \| Maximum [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Debentures Subject to Mandatory Redemption [Member] \| Muskogee Industrial Authority Bond Due 2027 [Member] \| Og and E [Member] \| Minimum [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.85%
Debentures Subject to Mandatory Redemption [Member] \| Muskogee Industrial Authority Bond Due 2027 [Member] \| Og and E [Member] \| Maximum [Member]
Schedule of Capitalization, Long-Term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%

Summary of Significant Accounting Policies Property - Summary of OG&E's Ownership Interest in Jointly-owned Plant (Parenthetical) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
McClain Plant [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	$ 0.3	$ 0.7
Redbud Plant [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	2.0	1.5
Amount of Acquisition Adjustments	148.3	148.3
Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation	$ 83.8	$ 78.3

Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2023

Revenues from Contract with Customers [Abstract]

Disaggregation of Revenue


	Year Ended December 31,
(In millions)	2023		2022			2021
Residential	$	1,008.6	$	1,272.6		$	1,309.1
Commercial		674.6		803.3			749.1
Industrial		229.6		317.3			323.1
Oilfield		207.8		304.3			312.8
Public authorities and street light		228.5		291.6			284.4
System sales revenues		2,349.1		2,989.1			2,978.5
Provision for rate refund		2.0		(1.2	)		—
Integrated market		71.6		163.8			468.9
Transmission		143.0		131.7			140.2
Other		41.6		20.8			1.1
Revenues from contracts with customers	$	2,607.3	$	3,304.2		$	3,588.7

Summary of Significant Accounting Policies Property - Schedule of Related Party Transactions (Details) - USD ($) $ in Millions	11 Months Ended	12 Months Ended
	Dec. 02, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Operating revenues		$ 2,674.3	$ 3,375.7	$ 3,653.7
Og and E [Member]
Related Party Transaction [Line Items]
Operating revenues		$ 2,674.3	$ 3,375.7	$ 3,653.7
Og and E [Member] \| Enable Midstream Partners [Member]
Related Party Transaction [Line Items]
Operating revenues	$ 13.3
Og and E [Member] \| Enable Midstream Partners [Member] \| Natural Gas Transportation [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	32.7
Og and E [Member] \| Enable Midstream Partners [Member] \| Natural Gas Sales [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases and Sales from Related Party	$ (33.5)

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

+ Details

Common Equity - Dividends Restriction (Additional Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Preferred Stock, Shares Outstanding	0
Stock Issued During Period, Shares, New Issues	82,321	27,278
OGE Energy [Member]
Retained Earnings, Restricted	$ 930.9
Retained Earnings, Unrestricted	$ 2,400.0
OGE Energy [Member] \| Maximum [Member]
Ratio of Consolidated Debt to Consolidated Capitalization	70.00%
Og and E [Member]
Ratio of Consolidated Debt to Consolidated Capitalization	65.00%
Retained Earnings, Restricted	$ 733.3
Retained Earnings, Unrestricted	$ 2,700.0
Stock Issued During Period, Shares, New Issues	0	0	0

Fair Value Measurements

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Fair Value Measurements

5. Fair Value Measurements

Level 1 inputs are quoted prices in active markets for identical unrestricted assets or liabilities that are accessible at the measurement date.

The Registrants had no financial instruments measured at fair value on a recurring basis at December 31, 2023 and 2022. The following table presents the carrying amount and fair value of the Registrants' financial instruments at December 31, 2023 and 2022, as well as the classification level within the fair value hierarchy.


	2023				2022
December 31 (In millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Classification
Long-term Debt (including Long-term Debt due within one year):
OGE Energy Senior Notes	$	—	$	—	$	499.9	$	491.2	Level 2
OGE Energy Term Loan	$	49.9	$	50.0	$	49.8	$	50.0	Level 2
OG&E Senior Notes	$	4,146.0	$	3,922.3	$	3,854.2	$	3,477.1	Level 2
OG&E Industrial Authority Bonds	$	135.4	$	135.4	$	135.4	$	135.4	Level 2
Tinker Debt	$	9.2	$	7.1	$	9.3	$	7.3	Level 3

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Regulatory Assets and Liabilities

The following table presents a summary of OG&E's regulatory assets and liabilities.


December 31 (In millions)	2023		2022
REGULATORY ASSETS
Current:
Oklahoma Energy Efficiency Rider under recoveries (A)	$	3.8	$	7.7
Oklahoma fuel clause under recoveries		—		474.3
Arkansas fuel clause under recoveries		—		40.6
Other (A)		2.7		4.7
Total current regulatory assets	$	6.5	$	527.3
Non-current:
Oklahoma deferred storm expenses	$	261.1	$	206.3
Pension tracker		91.9		57.2
Benefit obligations regulatory asset		89.4		119.7
Arkansas Winter Storm Uri costs		71.0		78.2
Sooner Dry Scrubbers		17.2		18.1
Arkansas deferred pension expenses		12.7		12.3
Unamortized loss on reacquired debt		7.2		8.0
COVID-19 impacts		6.8		7.7
Oklahoma SAP S/4 HANA deferred expenses		6.0		0.7
Frontier Plant deferred expenses		3.6		5.2
Other		10.7		10.9
Total non-current regulatory assets	$	577.6	$	524.3
REGULATORY LIABILITIES
Current:
Oklahoma fuel clause over recoveries	$	15.6	$	—
SPP cost tracker over recovery (B)		10.4		3.0
Arkansas fuel clause over recoveries		4.9		—
Other (B)		2.3		2.5
Total current regulatory liabilities	$	33.2	$	5.5
Non-current:
Income taxes refundable to customers, net	$	838.0	$	894.7
Accrued removal obligations, net		222.0		250.5
Other		1.6		1.9
Total non-current regulatory liabilities	$	1,061.6	$	1,147.1

(A)

Included in Other Current Assets in the balance sheets.

Included in Other Current Liabilities in the balance sheets.

Summary of Components of Benefit Obligation

The following table presents a summary of the components of the benefit obligations regulatory asset.


December 31 (In millions)	2023		2022
Pension Plan and Restoration of Retirement Income Plan:
Net loss	$	75.9	$	110.0
Postretirement Benefit Plans:
Net loss		13.5		9.7
Total	$	89.4	$	119.7

Schedule of Jointly Owned Utility Plants


December 31, 2023 (In millions)	Percentage Ownership			Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
McClain Plant (A)		77	%	$	265.4	$	129.2	$	136.2
Redbud Plant (A)(B)		51	%	$	548.9	$	245.5	$	303.4

(A)

Construction work in progress was $0.3 million and $2.0 million for the McClain and Redbud Plants, respectively.

(B)

This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.


December 31, 2022 (In millions)	Percentage Ownership			Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
McClain Plant (A)		77	%	$	261.9	$	119.4	$	142.5
Redbud Plant (A)(B)		51	%	$	542.1	$	225.2	$	316.9

(A)

Construction work in progress was $0.7 million and $1.5 million for the McClain and Redbud Plants, respectively.

(B)

This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $78.3 million.

Summary of Property Plant and Equipment

The following tables present the Registrants' major classes of property, plant and equipment and related accumulated depreciation.


December 31, 2023 (In millions)	Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
OG&E:
Distribution assets	$	6,290.1	$	1,564.3	$	4,725.8
Electric generation assets (A)		5,295.9		2,081.0		3,214.9
Transmission assets (B)		3,306.7		707.6		2,599.1
Intangible plant		568.5		219.8		348.7
Other property and equipment		643.1		236.7		406.4
OG&E property, plant and equipment		16,104.3		4,809.4		11,294.9
Non-OG&E property, plant and equipment		6.1		—		6.1
Total OGE Energy property, plant and equipment	$	16,110.4	$	4,809.4	$	11,301.0

(A)

This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.

(B)

This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.1 million.


December 31, 2022 (In millions)	Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
OG&E:
Distribution assets	$	5,781.3	$	1,527.1	$	4,254.2
Electric generation assets (A)		5,188.1		1,982.7		3,205.4
Transmission assets (B)		3,180.5		667.9		2,512.6
Intangible plant		384.0		193.6		190.4
Other property and equipment		591.3		213.2		378.1
OG&E property, plant and equipment		15,125.2		4,584.5		10,540.7
Non-OG&E property, plant and equipment		6.1		—		6.1
Total OGE Energy property, plant and equipment	$	15,131.3	$	4,584.5	$	10,546.8

(A)

This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $78.3 million.

(B)

This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.0 million.

Schedule of Change in Asset Retirement Obligation

The following table presents changes to OG&E's asset retirement obligations during the years ended December 31, 2023 and 2022.


(In millions)	2023		2022
Balance at January 1	$	78.3	$	80.2
Accretion expense		0.7		0.6
Liabilities settled (A)		—		(2.5	)
Revisions in estimated cash flows (B)		2.3		—
Balance at December 31	$	81.3	$	78.3

(A) Asset retirement obligations were settled for asbestos removal at OG&E's generating facilities.

(B) Assumptions changed related to the estimated timing and estimated cost of the removal of asbestos at OG&E's generating facilities.

Summary of Accumulated Other Comprehensive Income (Loss) (Details)

The following table presents changes in the components of accumulated other comprehensive income (loss) attributable to OGE Energy during 2023 and 2022. All amounts below are presented net of tax.


	Pension Plan and Restoration of Retirement Income Plan						Postretirement Benefit Plans
(In millions)	Net Gain (Loss)			Prior Service Cost (Credit)			Net Gain (Loss)			Prior Service Cost (Credit)			Total
Balance at December 31, 2021	$	(24.9	)	$	(1.2	)	$	1.1		$	0.2		$	(24.8	)
Other comprehensive income (loss) before reclassifications		(7.6	)		—			5.5			—			(2.1	)
Amounts reclassified from accumulated other comprehensive income (loss)		1.4			0.2			—			(0.2	)		1.4
Settlement cost		13.6			—			—			—			13.6
Net current period other comprehensive income (loss)		7.4			0.2			5.5			(0.2	)		12.9
Balance at December 31, 2022		(17.5	)		(1.0	)		6.6			—			(11.9	)
Other comprehensive income (loss) before reclassifications		3.3			—			(0.8	)		—			2.5
Amounts reclassified from accumulated other comprehensive income (loss)		0.9			0.2			(0.1	)		—			1.0
Settlement cost		1.2			—			—			—			1.2
Net current period other comprehensive income (loss)		5.4			0.2			(0.9	)		—			4.7
Balance at December 31, 2023	$	(12.1	)	$	(0.8	)	$	5.7		$	—		$	(7.2	)

Reclassified Out of Accumulated Other Comprehensive Income (Loss)


Details about Accumulated Other Comprehensive Income (Loss) Components	Amount Reclassified from Accumulated Other Comprehensive Income (Loss)						Affected Line Item in OGE Energy's Statements of Income
	Year Ended December 31,
(In millions)	2023			2022
Amortization of Pension Plan and Restoration of Retirement Income Plan items:
Actuarial losses	$	(1.1	)	$	(1.6	)	(A)
Prior service cost		(0.3	)		(0.3	)	(A)
Settlement cost		(1.6	)		(17.9	)	(A)
		(3.0	)		(19.8	)	Income Before Taxes
		(0.7	)		(4.6	)	Income Tax Expense
	$	(2.3	)	$	(15.2	)	Net Income

Amortization of postretirement benefit plans items:
Prior service credit	$	—		$	0.3		(A)
Actuarial gains		0.2			—		(A)
		0.2			0.3		Income Before Taxes
		0.1			0.1		Income Tax Expense
	$	0.1		$	0.2		Net Income

Total reclassifications for the period, net of tax	$	(2.2	)	$	(15.0	)	Net Income

(A)

These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 11 for additional information).

Reconciliation of Equity in Earnings (Losses) of Unconsolidated Affiliates

The following table presents a reconciliation of OGE Energy's equity in earnings of unconsolidated affiliates for the period of January 1, 2021 through December 2, 2021.


(In millions)
Enable net income used to calculate OGE Energy's equity in earnings	$	470.0
OGE Energy's percent ownership at period end		25.5	%
OGE Energy's portion of Enable net income	$	119.8
Amortization of basis difference and dilution recognition (A)		50.0
Equity in earnings of unconsolidated affiliates	$	169.8

(A)

Includes loss on dilution, net of proportional basis difference recognition.

Schedule of Related Party Transactions

The following table presents summarized related party transactions between OG&E and Enable during the period of January 1, 2021 through December 2, 2021.


(In millions)
Operating revenues:
Electricity to power electric compression assets	$	13.3
Fuel, purchased power and direct transmission expense:
Natural gas transportation services	$	32.7
Natural gas sales	$	(33.5	)