0001021635-22-000037 | 10-K | XBRL Viewer

Current Federal Tax Expense (Benefit)

$ 1,231.1

$ 1,188.9

(9.0)

(3.8)

$ (7.9)

Current State and Local Tax Expense (Benefit)

9.0

(0.6)

4.1

Current Income Tax Expense (Benefit)

0.0

(4.4)

(3.8)

Deferred Federal Income Tax Expense (Benefit)

58.3

45.7

37.7

Deferred State and Local Income Tax Expense (Benefit)

(16.5)

(6.6)

(13.8)

Deferred Income Tax Expense (Benefit)

41.8

39.1

23.9

Income Tax Expense (Benefit)

$ 41.8

$ 34.7

$ 20.1

Statutory federal tax rate

21.00%

Federal renewable energy credit (A)

^[1]

(4.40%)

(5.40%)

(7.60%)

Effective Income Tax Rate Reconciliation, Disposition of Business, Percent

^[2]

0.00%

Remeasurement of state deferred tax liabilities

0.00%

401(k) dividends

0.00%

State income taxes, net of federal income tax benefit

(1.40%)

(1.60%)

(1.80%)

Effective Income Tax Rate Reconciliation, Executive Compensation Limitation, Percent

0.00%

Amortization of net unfunded deferred taxes

(4.60%)

(4.80%)

(5.60%)

Effective income tax rate

(0.20%)

0.10%

(0.60%)

10.40%

9.30%

5.40%

Accrued liabilities

$ (7.3)

$ (5.2)

Accrued vacation

(1.2)

(1.6)

Uncollectible accounts

(0.6)

(0.7)

Accelerated depreciation and other property related differences

1,677.3

1,721.2

Investment in Enable

0.0

Deferred Tax Liabilities, Investments

0.0

Regulatory assets

52.1

52.3

Income taxes recoverable from customers, net

(225.8)

(221.8)

Pension Plan

32.0

27.4

Bond redemption-unamortized costs

1.8

2.0

Derivative instruments

0.0

Federal tax credits

(209.8)

(236.6)

Postretirement medical and life insurance benefits

(205.9)

(189.0)

(13.0)

(15.3)

Net operating losses

0.0

(1.4)

Regulatory liabilities

(72.0)

(81.0)

Asset retirement obligations

(19.4)

(20.3)

Deferred federal investment tax credits

(3.1)

(2.7)

Total deferred income tax liabilities, net

(4.7)

(6.5)

1,000.4

1,020.8

Unrecognized Tax Benefits

18.1

17.6

$ 16.4

Unrecognized Tax Benefits

22.4

21.9

20.7

$ 20.7

Current year additions

1.7

1.2

0.0

Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions

(1.2)

0.0

$ 0.0

Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued

0.0

Tax Credit Carryforward, Deferred Tax Asset

$ 209.8

$ 236.6

Stock-based compensation

0.00%

Effective Income Tax Rate Reconciliation, Tax Contingency, Percent

^[3]

0.00%

Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount

$ 6.6

Deferred Tax Asset [Member]

Unrecognized Tax Benefits

18.1

State operating loss [Member]

Operating Loss Carryforwards

0.0

Deferred Tax Assets, Operating Loss Carryforwards, State and Local

0.0

Federal tax credits [Member]

Federal tax credits

(209.8)

Tax Credit Carryforward, Deferred Tax Asset

209.8

209.8

Oklahoma investment tax credits [Member]

(164.2)

Oklahoma capital investment board credits [Member]

207.8

(12.8)

Oklahoma zero emission tax credits [Member]

12.8

(28.9)

Louisiana inventory credits

37.5

0.0

Research and Development Credits [Member]

0.0

$ 1.7

$ 1.2

[1]	Represents credits primarily associated with the production from OG&E's wind farms.
[2]	In connection with the Enable and Energy Transfer merger, the state income tax rates are expected to decrease, as Energy Transfer operates in significantly more states with generally lower tax rates than the historic Enable operating area.
[3]	As further discussed in Note 5, OGE Energy recorded a $780.0 million impairment on its investment in Enable in March 2020, which resulted in a tax benefit being recorded that caused a significant variance to the effective tax rate. This variance has been presented in the table as a single line item in order to facilitate comparability of other components of the effective tax rate.

Rate Matters and Regulation (Details) $ in Millions	12 Months Ended
Rate Matters and Regulation (Details) $ in Millions	Dec. 31, 2021 USD ($)
OG&E's Jurisdictional Revenues	3.00%
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 163.5
Public Utilities, Requested Return on Equity, Percentage	10.20%
Estimated Refund to SPP	$ 13.0
Public Utilities, Approved Rate Increase (Decrease), Amount	6.7
Securitization Authorization Requested	760.0
Securitization Fuel Purchase Request	748.9
Securitization Fuel Cost Request Prudency	739.1
Plan Investments for Customers	28.0
Requested Recovery of Capital Investment	$ 1,200.0
Common Equity Percentage which ROE is based	53.37%
Grid Enhancement
Revenue Requirement	$ 7.0
Minimum [Member]
Lost Revenue on Plant Investments for Customers	28.9
Maximum [Member]
Lost Revenue on Plant Investments for Customers	39.3
In Favor Cooperatives [Member]
Plan Investments for Customers	11.7
In Favor Cooperatives [Member] \| Minimum [Member]
Lost Revenues on Plant Investments for Customers	2.9
In Favor Cooperatives [Member] \| Maximum [Member]
Lost Revenues on Plant Investments for Customers	4.5
Impact to Company [Member]
Estimated Refund to SPP	5.0
Customer Impact [Member]
Estimated Refund to SPP	$ 8.0

Report of Business Segments

12 Months Ended

Dec. 31, 2021

Report of Business Segments

OGE Energy reports its operations in two business segments: (i) the electric utility segment, which is engaged in the generation, transmission, distribution and sale of electric energy and (ii) natural gas midstream operations segment. 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. Subsequent to December 2, 2021, OGE Energy's natural gas midstream operations segment includes its investment in Energy Transfer's equity securities and legacy Enable seconded employee pension and postretirement costs. Other operations primarily includes the operations of the holding company. Intersegment revenues are recorded at prices comparable to those of unaffiliated customers and are affected by regulatory considerations. The following tables present the results of OGE Energy's business segments for the years ended December 31, 2021, 2020 and 2019.


2021	Electric Utility		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


2020	Electric Utility		Natural Gas Midstream Operations		Other Operations		Eliminations		Total
(In millions)
Operating revenues	$	2,122.3	$	—	$	—	$	—	$	2,122.3
Fuel, purchased power and direct transmission expense	644.6		—		—		—		644.6
Other operation and maintenance	464.4		1.7		(3.3)		—		462.8
Depreciation and amortization	391.3		—		—		—		391.3
Taxes other than income	97.2		0.4		3.8		—		101.4
Operating income (loss)	524.8		(2.1)		(0.5)		—		522.2
Equity in losses of unconsolidated affiliates (A)	—		(668.0)		—		—		(668.0)
Other income (expense)	4.1		(2.9)		3.6		(1.6)		3.2
Interest expense	154.8		—		5.3		(1.6)		158.5
Income tax expense (benefit)	34.7		(158.0)		(4.1)		—		(127.4)
Net income (loss)	$	339.4	$	(515.0)	$	1.9	$	—	$	(173.7)


Investment in unconsolidated affiliates	$	—	$	374.3	$	—	$	—	$	374.3
Total assets	$	10,489.0	$	378.1	$	116.4	$	(264.7)	$	10,718.8
Capital expenditures	$	650.5	$	—	$	—	$	—	$	650.5

(A)In March 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Notes 5 and 7.


2019	Electric Utility		Natural Gas Midstream Operations		Other Operations		Eliminations		Total
(In millions)
Operating revenues	$	2,231.6	$	—	$	—	$	—	$	2,231.6
Fuel, purchased power and direct transmission expense	786.9		—		—		—		786.9
Other operation and maintenance	492.5		2.8		(3.5)		—		491.8
Depreciation and amortization	355.0		—		—		—		355.0
Taxes other than income	89.5		0.4		3.7		—		93.6
Operating income (loss)	507.7		(3.2)		(0.2)		—		504.3
Equity in earnings of unconsolidated affiliates	—		113.9		—		—		113.9
Other income (expense)	3.1		(8.6)		2.2		(3.6)		(6.9)
Interest expense	140.5		—		11.0		(3.6)		147.9
Income tax expense (benefit)	20.1		20.7		(11.0)		—		29.8
Net income	$	350.2	$	81.4	$	2.0	$	—	$	433.6


Investment in unconsolidated affiliates	$	—	$	1,132.9	$	—	$	—	$	1,132.9
Total assets	$	10,076.6	$	1,135.4	$	107.0	$	(294.7)	$	11,024.3
Capital expenditures	$	635.5	$	—	$	—	$	—	$	635.5

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.

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Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

Common Equity (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

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


(In millions except per share data)	2021		2020		2019
Net income (loss)	$	737.3	$	(173.7)	$	433.6
Average common shares outstanding:
Basic average common shares outstanding	200.1		200.1		200.1
Effect of dilutive securities:
Contingently issuable shares (performance and restricted stock units)	0.2		—		0.6
Diluted average common shares outstanding	200.3		200.1		200.7
Basic earnings (loss) per average common share	$	3.68	$	(0.87)	$	2.17
Diluted earnings (loss) per average common share	$	3.68	$	(0.87)	$	2.16
Anti-dilutive shares excluded from earnings per share calculation	—		0.3		—

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

The following table presents OGE Energy's financial instrument measured at fair value on a recurring basis and the carrying amount and fair value of the Registrants' financial instruments at December 31, 2021 and 2020, as well as the classification level within the fair value hierarchy.


	2021				2020
December 31 (In millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Classification
Financial instrument measured at fair value on a recurring basis:
OGE Energy investment in Energy Transfer's equity securities	$	785.1	$	785.1	(A)		(A)		Level 1

Financial instruments for which fair value is only disclosed:
Long-term Debt (including Long-term Debt due within one year):
OGE Energy Senior Notes	$	499.9	$	497.8	$	—	$	—	Level 2
OG&E Senior Notes	$	3,851.8	$	4,460.2	$	3,349.6	$	4,182.1	Level 2
OG&E Industrial Authority Bonds	$	135.4	$	135.4	$	135.4	$	135.4	Level 2
Tinker Debt	$	9.3	$	10.0	$	9.4	$	10.7	Level 3

(A)OGE Energy's ownership of Energy Transfer securities was effective as of December 2, 2021; therefore, the investment in Energy Transfer's equity securities was not held at December 31, 2020.

STATEMENTS OF CHANGES IN STOCKHOLDER'S EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Premium on Common Stock	Retained Earnings
Common Stock, Shares, Outstanding		40.4
Stockholders' Equity Attributable to Parent	$ 3,603.3	$ 100.9	$ 930.9	$ 2,571.5
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares		0.0
Net Income (Loss) Attributable to Parent	350.2	$ 0.0	0.0	350.2
Dividends, Common Stock, Cash, Number of Shares		0.0
Dividends, Common Stock	(325.0)	$ 0.0	0.0	325.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares		0.0
Stock-based compensation	4.8	$ 0.0	4.8	0.0
Common Stock, Shares, Outstanding		40.4
Stockholders' Equity Attributable to Parent	3,958.3	$ 100.9	935.7	2,921.7
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares		0.0
Net Income (Loss) Attributable to Parent	339.4	$ 0.0	0.0	339.4
Dividends, Common Stock, Cash, Number of Shares		0.0
Dividends, Common Stock				0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares		0.0
Stock-based compensation	$ (2.9)	$ 0.0	(2.9)	0.0
Common Stock, Shares, Outstanding	40.4	40.4
Stockholders' Equity Attributable to Parent	$ 3,975.6	$ 100.9	938.6	2,936.1
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares		0.0
Net Income (Loss) Attributable to Parent	360.0	$ 0.0	0.0	360.0
Dividends, Common Stock, Cash, Number of Shares		0.0
Dividends, Common Stock	(265.0)	$ 0.0	0.0	265.0
Proceeds from Contributed Capital, Shares		0.0
Proceeds from Contributed Capital	530.0	$ 0.0	530.0	0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares		0.0
Stock-based compensation	$ 2.2	$ 0.0	2.2	0.0
Common Stock, Shares, Outstanding	40.4	40.4
Stockholders' Equity Attributable to Parent	$ 4,602.8	$ 100.9	$ 1,470.8	$ 3,031.1

Summary of Significant Accounting Policies Allowance for Uncollectible Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Allowance for Doubtful Accounts Receivable	$ 2.4	$ 2.6

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

CASH FLOWS FROM OPERATING ACTIVITIES

$ 737.3

$ (173.7)

$ 433.6

Adjustments to reconcile net income (loss) to net cash (used in) provided from operating activities:

(353.0)

0.0

Deferred income taxes and other tax credits, net

416.0

391.3

355.0

44.6

40.9

20.4

Equity in (earnings) losses of unconsolidated affiliates

(169.8)

668.0

^[1],[2]

(113.9)

^[1]

Distributions from unconsolidated affiliates

73.4

91.7

125.5

Unrealized Gain (Loss) on Investments

8.6

0.0

Allowance for equity funds used during construction

(6.7)

(4.8)

(4.5)

Stock-based compensation expense

2.2

3.0

4.9

Regulatory assets

874.9

112.0

47.1

Regulatory liabilities

(71.2)

(64.0)

(45.6)

Other assets

(2.2)

(3.4)

3.8

Other liabilities

(11.2)

(24.3)

8.4

Change in certain current assets and liabilities:

Accounts receivable and accrued unbilled revenues, net

(3.0)

4.5

17.0

Income taxes receivable

5.5

2.8

(1.0)

Fuel, materials and supplies inventories

(3.4)

(8.9)

4.2

Fuel recoveries

(180.5)

63.3

(33.0)

Other current assets

(21.4)

(17.3)

5.9

Accounts payable

(11.0)

64.8

(30.0)

Other current liabilities

3.3

(26.8)

(35.1)

Net cash (used in) provided from operating activities

(358.7)

640.4

573.8

CASH FLOWS FROM INVESTING ACTIVITIES

Capital expenditures (less allowance for equity funds used during construction)

(778.5)

(650.5)

(635.5)

Return of capital - unconsolidated affiliates

(5.6)

(4.4)

(7.7)

0.0

18.5

Proceeds from Divestiture of Businesses and Interests in Affiliates

35.0

0.0

Net cash used in investing activities

(778.5)

(650.5)

(635.5)

Proceeds from Contributions from Parent

530.0

0.0

CASH FLOWS FROM FINANCING ACTIVITIES

Increase (decrease) in short-term debt

391.9

(17.0)

112.0

Proceeds from long-term debt

499.8

297.1

296.5

Payment of long-term debt

(0.1)

(250.1)

Dividends paid on common stock

(265.0)

(325.0)

0.0

Cash paid for employee equity-based compensation and expense of common stock

(3.4)

(7.1)

(10.3)

Purchase of treasury stock

0.0

(0.1)

0.0

0.0

(14.7)

0.0

Net cash provided from (used in) financing activities

1,137.2

10.1

61.7

NET CHANGE IN CASH AND CASH EQUIVALENTS

0.0

CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR

0.0

CASH AND CASH EQUIVALENTS AT END OF YEAR

0.0

Interest costs capitalized

3.5

1.9

2.8

Net Income (Loss) Attributable to Parent

360.0

339.4

350.2

Increase (Decrease) in Income Taxes Payable

0.7

(5.3)

(0.7)

Changes In Advances With Parent

372.5

38.1

15.3

Interest (net of interest capitalized)

148.9

150.2

144.6

Income taxes (net of income tax refunds)

(3.2)

(0.2)

1.3

Power plant long-term service agreement

2.4

6.8

28.9

Noncash or Part Noncash Acquisition, Investments Acquired

$ 793.7

$ 0.0

[1]

For the year ended December 31, 2020, Enable recorded a $225.0 million impairment on its SESH equity method investment. Enable estimated the fair value of this equity method investment was below the carrying value at September 30, 2020 and concluded the decline in value was other than temporary due to the expiration of a transportation contract and the current status of renewal negotiations. The impairment ran through OGE Energy's portion of Enable net income and was offset by basis differences that flow through the amortization of basis difference and dilution recognition line item above

[2]

In March 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Notes 5 and 7.

Related Party Disclosures (Tables)

12 Months Ended

Dec. 31, 2021

The following table presents summarized related party transactions between OG&E and Enable during the period of January 1, 2021 through December 2, 2021 and the years ended December 31, 2020 and 2019.


	Period of January 1, 2021 through December 2, 2021		Year Ended
(In millions)			December 31, 2020		December 31, 2019
Operating revenues:
Electricity to power electric compression assets	$	13.3	$	15.1	$	15.9
Fuel, purchased power and direct transmission expense:
Natural gas transportation services	$	32.7	$	32.8	$	41.2

Natural gas purchases (sales)	$	(33.5)	$	2.7	$	(6.0)

Summary of Significant Accounting Policies Summary of Significant Accounting Policies Reclassifications (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Prior Period Reclassification Adjustment	$ 23.1

Schedule II

9 Months Ended

Sep. 30, 2021

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

SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

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, 2019
Reserve for Uncollectible Accounts	$	1.7	$	2.2	$	2.4	$	1.5
Balance at December 31, 2020
Reserve for Uncollectible Accounts	$	1.5	$	3.0	$	1.9	$	2.6
Balance at December 31, 2021
Reserve for Uncollectible Accounts	$	2.6	$	3.2	$	3.4	$	2.4

(A)Uncollectible accounts receivable written off, net of recoveries.

Retirement Plans and Postretirement Benefit Plans

12 Months Ended

Dec. 31, 2021

Retirement Plans and Postretirement Benefit Plans [Abstract]

Pension and Other Postretirement Benefits Disclosure [Text Block]

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

It is OGE Energy's policy to fund the Pension Plan on a current basis based on the net periodic pension expense as determined by 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 made a $40.0 million and $20.0 million contribution to its Pension Plan in 2021 and 2020, of which $30.0 million and $10.0 million was attributed to OG&E in 2021 and 2020, respectively. OGE Energy does not expect it will need to make any contributions to the Pension Plan in 2022. Any contribution to the Pension Plan during 2022 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 2021, 2020 and 2019, 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 table. 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

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 2021 and 2020 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's seconded employee contract with Enable was terminated on December 2, 2021. OGE Energy retains the obligations to the balances and accrued benefits of these former employees as of the termination of the contract.


	OGE Energy								OG&E
	Pension Plan				Restoration of Retirement Income Plan				Pension Plan				Restoration of Retirement Income Plan
December 31 (In millions)	2021		2020		2021		2020		2021		2020		2021		2020
Change in benefit obligation
Beginning obligations	$	654.6	$	616.1	$	7.8	$	10.3	$	484.1	$	462.0	$	3.0	$	6.1
Service cost	11.2		13.2		0.8		0.8		7.7		9.2		—		0.1
Interest cost	13.3		17.0		0.1		0.2		9.7		12.6		—		0.1
Plan settlements	(158.6)		(42.8)		(4.6)		(5.3)		(120.4)		(33.5)		(2.9)		(4.5)
Plan amendments	—		—		1.4		—		—		—		—		—
Plan curtailments	—		—		(0.1)		0.2		—		—		—		—
Special termination benefits	—		7.6		—		—		—		5.1		—		—

Actuarial (gains) losses	(3.5)		57.7		0.5		1.6		(6.0)		41.0		0.4		1.2
Benefits paid	(14.1)		(14.2)		—		—		(11.9)		(12.3)		—		—
Ending obligations	$	502.9	$	654.6	$	5.9	$	7.8	$	363.2	$	484.1	$	0.5	$	3.0

Change in plans' assets
Beginning fair value	$	570.3	$	530.3	$	—	$	—	$	420.3	$	399.1	$	—	$	—
Actual return on plans' assets	48.4		77.0		—		—		35.0		57.0		—		—
Employer contributions	40.0		20.0		4.6		5.3		30.0		10.0		2.9		4.5
Plan settlements	(158.6)		(42.8)		(4.6)		(5.3)		(120.4)		(33.5)		(2.9)		(4.5)

Benefits paid	(14.1)		(14.2)		—		—		(11.9)		(12.3)		—		—
Ending fair value	$	486.0	$	570.3	$	—	$	—	$	353.0	$	420.3	$	—	$	—
Funded status at end of year	$	(16.9)	$	(84.3)	$	(5.9)	$	(7.8)	$	(10.2)	$	(63.8)	$	(0.5)	$	(3.0)
Accumulated postretirement benefit obligation	$	475.2	$	610.8	$	5.4	$	6.9	$	341.0	$	454.7	$	0.4	$	2.9

For the year ended December 31, 2021, Pension Plan actuarial gains were primarily due to favorable demographic experience and a higher discount rate. These gains were partially offset by a difference in lump sum interest rates and the long-term assumption for Enable seconded employee terminations and more retirements and terminations than expected with lump sum payouts. For the year ended December 31, 2020, Pension Plan actuarial losses were primarily due to movement in the discount rate, special termination benefits due to a voluntary retirement program offered by OGE Energy and more retirements and terminations than expected which were expected to accelerate lump sum payments in 2021. These losses were partially offset by gains from lowering the interest crediting rate and plan mortality assumptions.


	OGE Energy				OG&E
	Postretirement Benefit Plans				Postretirement Benefit Plans
December 31 (In millions)	2021		2020		2021		2020
Change in benefit obligation
Beginning obligations	$	144.5	$	136.5	$	109.5	$	104.7
Service cost	0.2		0.2		0.1		0.2
Interest cost	3.4		4.2		2.6		3.2

Plan curtailments	1.9		4.0		—		3.1
Participants' contributions	3.5		3.3		2.6		2.4
Actuarial (gains) losses	(3.7)		7.3		(2.5)		4.5
Benefits paid	(12.5)		(11.0)		(9.9)		(8.6)
Ending obligations	$	137.3	$	144.5	$	102.4	$	109.5

Change in plans' assets
Beginning fair value	$	47.6	$	47.0	$	42.7	$	41.9
Actual return on plans' assets	(0.5)		1.2		(0.5)		1.1
Employer contributions	6.2		7.1		5.0		5.9

Participants' contributions	3.5		3.3		2.6		2.4
Benefits paid	(12.5)		(11.0)		(9.9)		(8.6)
Ending fair value	$	44.3	$	47.6	$	39.9	$	42.7
Funded status at end of year	$	(93.0)	$	(96.9)	$	(62.5)	$	(66.8)

Curtailment loss for the year ended December 31, 2021 is related to Enable seconded employees who terminated employment as a result of the merger with Energy Transfer. This reduction in future service of the active participants triggered curtailment accounting as of December 31, 2021. Special termination benefits and curtailment loss for the year ended December 31, 2020 are related to a voluntary retirement program offered by OGE Energy in the fourth quarter of 2020. A curtailment gain or loss is required when the expected future services or benefits in a benefit plan are significantly reduced or eliminated.

Net Periodic Benefit Cost

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 period benefit cost components as listed in the following tables are presented within Other Net Periodic Benefit 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 Expense in the statements of income.


	OGE Energy												OG&E
	Pension Plan						Restoration of Retirement Income Plan						Pension Plan						Restoration of Retirement Income Plan
Year Ended December 31 (In millions)	2021		2020		2019		2021		2020		2019		2021		2020		2019		2021		2020		2019
Service cost	$	11.2	$	13.2	$	12.9	$	0.8	$	0.8	$	0.5	$	7.7	$	9.2	$	9.0	$	—	$	0.1	$	0.2
Interest cost	13.3		17.0		20.7		0.1		0.2		0.4		9.7		12.6		15.6		—		0.1		0.2
Expected return on plan assets	(34.1)		(37.6)		(36.1)		—		—		—		(24.7)		(27.9)		(27.6)		—		—		—

Amortization of net loss	9.4		17.1		17.3		0.2		0.5		0.5		7.0		12.1		12.9		0.1		0.4		0.3
Plan curtailments	—		—		—		—		0.2		—		—		—		—		—		—		—
Special termination benefits	—		7.6		—		—		—		—		—		5.1		—		—		—		—
Amortization of unrecognized prior service cost (A)	—		—		—		0.1		—		—		—		—		—		—		—		—
Settlement cost	41.3		14.1		27.6		2.1		2.7		0.5		33.1		11.4		16.4		1.6		2.4		0.5
Total net periodic benefit cost	41.1		31.4		42.4		3.3		4.4		1.9		32.8		22.5		26.3		1.7		3.0		1.2
Less: Amount paid by unconsolidated affiliates (B)	(0.2)		2.0		2.9		0.1		0.1		0.1
Plus: Amount allocated from OGE Energy (B)													6.5		5.9		4.5		1.5		1.3		0.5
Net periodic benefit cost	$	41.3	$	29.4	$	39.5	$	3.2	$	4.3	$	1.8	$	39.3	$	28.4	$	30.8	$	3.2	$	4.3	$	1.7

(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.

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

In conjunction with the net periodic benefit cost amounts recognized, as presented in the table above, for the Pension and Restoration of Retirement Income Plans in 2021, 2020 and 2019, the Registrants recognized the following:



Year Ended December 31 (In millions)	2021		2020		2019
Increase of regulatory asset related to pension expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A)	$	23.0	$	13.8	$	16.1
Deferral of pension expense related to pension settlement, curtailment and special termination benefits charges included in the above line item:
Oklahoma jurisdiction (A)	$	37.9	$	21.6	$	17.9
Arkansas jurisdiction (A)	$	3.5	$	2.0	$	1.7

(A)Included in the pension regulatory asset or liability 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)	2021		2020		2019		2021		2020		2019
Service cost	$	0.2	$	0.2	$	0.2	$	0.1	$	0.2	$	0.2
Interest cost	3.4		4.2		5.6		2.6		3.2		4.3
Expected return on plan assets	(1.8)		(1.8)		(1.9)		(1.7)		(1.7)		(1.7)
Amortization of net loss	2.8		2.0		2.0		2.7		2.1		2.1
Plan curtailments	—		1.5		—		—		1.3		—
Amortization of unrecognized prior service cost (A)	(6.9)		(8.4)		(8.4)		(5.0)		(6.1)		(6.1)
Total net periodic benefit income	(2.3)		(2.3)		(2.5)		(1.3)		(1.0)		(1.2)
Less: Amount paid by unconsolidated affiliates (B)	(0.5)		(0.7)		(0.6)
Plus: Amount allocated from OGE Energy (B)							(0.5)		(0.5)		(0.6)
Net periodic benefit income	$	(1.8)	$	(1.6)	$	(1.9)	$	(1.8)	$	(1.5)	$	(1.8)

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

In conjunction with the net periodic benefit income amounts recognized, as presented in the table above, for the postretirement benefit plans in 2021, 2020 and 2019, the Registrants recognized the following:


Year Ended December 31 (In millions)	2021		2020		2019
Increase of regulatory liability related to postretirement expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A)	$	0.4	$	0.2	$	1.0
Deferral of postretirement expense related to postretirement plan curtailment charges included in the above line item:
Oklahoma jurisdiction (A)	$	—	$	(1.4)	$	—
Arkansas jurisdiction (A)	$	—	$	(0.1)	$	—

(A)Included in the pension regulatory asset or liability in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.

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 2021, 2020 and 2019.


	OGE Energy						OG&E
(In millions)	2021		2020		2019		2021		2020		2019
Capitalized portion of net periodic pension benefit cost	$	3.4	$	3.8	$	3.6	$	2.9	$	3.1	$	3.0
Capitalized portion of net periodic postretirement benefit cost	$	0.2	$	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	2021		2020		2019		2021		2020		2019
Assumptions to determine benefit obligations:
Discount rate	2.75	%	2.30	%	3.15	%	2.80	%	2.45	%	3.25	%
Rate of compensation increase	4.20	%	4.20	%	4.20	%	N/A		N/A		N/A
Interest crediting rate	3.50	%	3.50	%	4.00	%	N/A		N/A		N/A




Assumptions to determine net periodic benefit cost:
Discount rate	2.63	%	2.88	%	3.63	%	2.45	%	3.25	%	4.30	%
Expected return on plan assets	7.00	%	7.50	%	7.50	%	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	%	4.00	%	4.00	%	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 2021 and 2020, 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 due to recent returns on OGE Energy's long-term investment portfolio. 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 6.50 percent in 2022 with the rates trending downward to 4.50 percent by 2030.

Pension Plan

Pension Plan Investments, Policies and Strategies

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%

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	l Maximize risk-adjusted performance while providing long bond exposure managed according to the manager's forecast on interest rates. l All invested assets must reach at or above Baa3 or BBB- investment grade. l 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	l Maximize risk-adjusted performance. l At least 75 percent of invested assets much reach at or above Baaa3 or BBB- investment grade. l Limited five percent exposure to any single issuer, except the U.S. Government or affiliates. l May invest up to 10 percent of the market value in convertible bonds as long as quality guidelines are met. l 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	l Focus on replicating the performance of the S&P 500 Index.


Mid-Cap Equity (B)(C)	Russell Midcap Index Russell Midcap Value Index	l Focus on undervalued stocks expected to earn average return and pay out higher than average dividends. l Invest in companies with market capitalizations lower than average company on public exchanges: l Price/earnings ratio at or near referenced index; l Small dividend yield and return on equity at or near referenced index; and l Earnings per share growth rate at or near referenced index.

Small-Cap Equity (B)(C)	Russell 2000 Index Russell 2000 Value Index

International Equity (D)	Morgan Stanley Capital International ACWI ex-U.S.	l Invest in non-dollar denominated equity securities. l 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

The following tables present the Pension Plan's investments that are measured at fair value on a recurring basis at December 31, 2021 and 2020. There were no Level 3 investments held by the Pension Plan at December 31, 2021 and 2020.


(In millions)	December 31, 2021		Level 1		Level 2		Net Asset Value (A)
Common stocks	$	86.1	$	86.1	$	—	$	—
U.S. Treasury notes and bonds (B)	135.2		135.2		—		—
Mortgage- and asset-backed securities	24.6		—		24.6		—
Corporate fixed income and other securities	107.0		—		107.0		—
Commingled fund (C)	23.6		—		—		23.6
Foreign government bonds	0.9		—		0.9		—
U.S. municipal bonds	1.4		—		1.4		—

Money market fund	5.5		—		—		5.5
Mutual fund	99.8		99.8		—		—
Preferred stocks	1.1		1.1		—		—
U.S. Treasury futures:


Cash collateral	0.6		0.6		—		—
Forward contracts:
Receivable (foreign currency)	0.1		—		0.1		—

Total Pension Plan investments	485.9		$	322.8	$	134.0	$	29.1

Interest and dividends receivable	2.1
Payable to broker for securities purchased	(2.0)
Total OGE Energy Pension Plan assets	$	486.0
Pension Plan investments attributable to affiliates	(133.0)
Total OG&E Pension Plan assets	$	353.0

(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.


(In millions)	December 31, 2020		Level 1		Level 2		Net Asset Value (A)

Common stocks	$	252.3	$	252.3	$	—	$	—


U.S. Treasury notes and bonds (B)	134.3		134.3		—		—
Mortgage- and asset-backed securities	29.3		—		29.3		—


Corporate fixed income and other securities	116.6		—		116.6		—

Commingled fund (C)	25.4		—		—		25.4
Foreign government bonds	4.6		—		4.6		—
U.S. municipal bonds	1.8		—		1.8		—

Money market fund	8.8		—		—		8.8

Mutual fund	9.2		9.2		—		—
Preferred stocks	0.6		0.6		—		—
U.S. Treasury Futures:


Cash collateral	0.7		0.7		—		—
Forward contracts:
Receivable (foreign currency)	0.1		—		0.1		—

Total Pension Plan investments	583.7		$	397.1	$	152.4	$	34.2
Receivable from broker for securities sold	0.2
Interest and dividends receivable	2.2
Payable to broker for securities purchased	(15.8)
Total OGE Energy Pension Plan assets	$	570.3
Pension Plan investments attributable to affiliates	(150.0)
Total OG&E Pension Plan assets	$	420.3

(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

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
2022	$	95.3	$	38.8
2023	$	37.0	$	30.7
2024	$	38.4	$	30.6
2025	$	36.7	$	28.7
2026	$	35.2	$	28.3
2027-2031	$	167.4	$	126.6

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

The following tables present the postretirement benefit plans' investments that are measured at fair value on a recurring basis at December 31, 2021 and 2020. There were no Level 2 investments held by the postretirement benefit plans at December 31, 2021 and 2020.


(In millions)	December 31, 2021		Level 1		Level 3
Group retiree medical insurance contract	$	28.1	$	—	$	28.1

Mutual funds	16.2		16.2		—


Total OGE Energy plan investments	$	44.3	$	16.2	$	28.1
Plan investments attributable to affiliates	(4.4)
Total OG&E plan investments	$	39.9


(In millions)	December 31, 2020		Level 1		Level 3
Group retiree medical insurance contract	$	33.4	$	—	$	33.4

Mutual funds	14.2		14.2		—


Total OGE Energy plan investments	$	47.6	$	14.2	$	33.4
Plan investments attributable to affiliates	(4.9)
Total OG&E plan investments	$	42.7

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)	2021
Group retiree medical insurance contract:
Beginning balance	$	33.4
Claims paid	(4.9)
Net unrealized losses related to instruments held at the reporting date	(1.1)
Investment fees	(0.1)
Realized losses	(0.1)
Interest income	0.7
Dividend income	0.2
Ending balance	$	28.1

Medicare Prescription Drug, Improvement and Modernization Act of 2003

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
2022	$	12.5	$	9.6
2023	$	12.2	$	9.3
2024	$	10.6	$	8.0
2025	$	10.1	$	7.6
2026	$	9.7	$	7.2
After 2026	$	40.3	$	30.2

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 $2.0 million and $2.2 million at December 31, 2021 and 2020, respectively, of which $1.5 million and $1.8 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 19 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 $15.4 million, $18.2 million and $14.4 million in 2021, 2020 and 2019, respectively, to the 401(k) Plan, of which $12.0 million, $14.3 million and $11.0 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 2021, 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.

The entire disclosure for retirement benefits.

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

Schedule II (Tables)

12 Months Ended

Dec. 31, 2021

Schedule II Valuation and Qualifying Accounts [Table Text Block]

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, 2019
Reserve for Uncollectible Accounts	$	1.7	$	2.2	$	2.4	$	1.5
Balance at December 31, 2020
Reserve for Uncollectible Accounts	$	1.5	$	3.0	$	1.9	$	2.6
Balance at December 31, 2021
Reserve for Uncollectible Accounts	$	2.6	$	3.2	$	3.4	$	2.4

(A)Uncollectible accounts receivable written off, net of recoveries.

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2021

Income Taxes [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

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


	OGE Energy						OG&E
Year Ended December 31 (In millions)	2021		2020		2019		2021		2020		2019
Provision (benefit) for current income taxes:
Federal	$	16.4	$	8.4	$	(6.4)	$	(9.0)	$	(3.8)	$	(7.9)
State	1.7		0.5		5.1		9.0		(0.6)		4.1
Total provision (benefit) for current income taxes	18.1		8.9		(1.3)		—		(4.4)		(3.8)
Provision (benefit) for deferred income taxes, net:
Federal	133.1		(105.2)		48.5		58.3		45.7		37.7
State	(10.0)		(31.1)		(17.4)		(16.5)		(6.6)		(13.8)
Total provision (benefit) for deferred income taxes, net	123.1		(136.3)		31.1		41.8		39.1		23.9

Total income tax expense (benefit)	$	141.2	$	(127.4)	$	29.8	$	41.8	$	34.7	$	20.1

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

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	2021		2020		2019		2021		2020		2019
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	0.9		(1.4)		(1.2)		(1.4)		(1.6)		(1.8)
Stock-based compensation	0.1		(0.3)		(1.2)		—		—		—
Executive compensation limitation	0.1		0.2		0.2		—		—		—
Amortization of net unfunded deferred taxes	(2.1)		(4.4)		(4.5)		(4.6)		(4.8)		(5.6)
Federal renewable energy credit (A)	(2.0)		(5.0)		(6.0)		(4.4)		(5.4)		(7.6)
Remeasurement of state deferred taxes due to Energy Transfer merger (B)	(1.1)		—		—		—		—		—
Remeasurement of state deferred tax liabilities	(0.6)		0.9		(0.8)		—		—		—
401(k) dividends	(0.2)		(0.4)		(0.4)		—		—		—
Impairment of OGE Energy's investment in Enable (C)	—		31.6		—		—		—		—
Other	—		0.1		(0.7)		(0.2)		0.1		(0.6)


Effective income tax rate	16.1	%	42.3	%	6.4	%	10.4	%	9.3	%	5.4	%

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

(B)In connection with the Enable and Energy Transfer merger, the state income tax rates are expected to decrease, as Energy Transfer operates in significantly more states with generally lower tax rates than the historic Enable operating area.

(C)As further discussed in Note 5, OGE Energy recorded a $780.0 million impairment on its investment in Enable in March 2020, which resulted in a tax benefit being recorded that caused a significant variance to the effective tax rate. This variance has been presented in the table as a single line item in order to facilitate comparability of other components of the effective tax rate.

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The following table presents the components of Deferred Income Taxes at December 31, 2021 and 2020.
















	OGE Energy				OG&E
December 31 (In millions)	2021		2020		2021		2020
Deferred income tax liabilities, net:
Accelerated depreciation and other property related differences	$	1,677.3	$	1,721.2	$	1,677.3	$	1,721.2

Investment in Enable	—		302.6		—		—
Investment in Energy Transfer's equity securities	363.5		—		—		—
Regulatory assets	52.1		52.3		52.1		52.3
Pension Plan	10.7		3.9		32.0		27.4
Other	7.4		(1.4)		(4.7)		(6.5)
Derivative instruments	2.2		1.7		—		—
Bond redemption-unamortized costs	1.8		2.0		1.8		2.0


Income taxes recoverable from customers, net	(225.8)		(221.8)		(225.8)		(221.8)
State tax credits	(221.2)		(204.4)		(205.9)		(189.0)
Federal tax credits	(208.4)		(236.6)		(209.8)		(236.6)
Regulatory liabilities	(72.0)		(81.0)		(72.0)		(81.0)
Asset retirement obligations	(19.4)		(20.3)		(19.4)		(20.3)
Postretirement medical and life insurance benefits	(19.2)		(22.4)		(13.0)		(15.3)
Accrued liabilities	(9.5)		(9.6)		(7.3)		(5.2)
Deferred federal investment tax credits	(3.1)		(2.7)		(3.1)		(2.7)
Net operating losses	(1.0)		(12.0)		—		(1.4)
Accrued vacation	(1.5)		(2.2)		(1.2)		(1.6)
Uncollectible accounts	(0.6)		(0.7)		(0.6)		(0.7)

Total deferred income tax liabilities, net	$	1,333.3	$	1,268.6	$	1,000.4	$	1,020.8

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

The following table presents a reconciliation of the Registrants' total gross unrecognized tax benefits as of the years ended December 31, 2021, 2020 and 2019.


(In millions)	2021		2020		2019
Balance at January 1	$	21.9	$	20.7	$	20.7
Tax positions related to current year:
Additions	1.7		1.2		—

Reductions	(1.2)		—		—
Balance at December 31	$	22.4	$	21.9	$	20.7

Summary of Tax Credit Carryforwards [Table Text Block]

The following table presents a summary of these carry forwards.


	OGE Energy				OG&E
(In millions)	Carry Forward Amount		Deferred Tax Asset		Carry Forward Amount		Deferred Tax Asset		Earliest Expiration Date

State operating loss	$	33.4	$	1.0	$	—	$	—	2032
Federal tax credits	$	208.4	$	208.4	$	209.8	$	209.8	2032
State tax credits:
Oklahoma investment tax credits	$	227.1	$	179.4	$	207.8	$	164.2	N/A
Oklahoma capital investment board credits	$	12.8	$	12.8	$	12.8	$	12.8	N/A
Oklahoma zero emission tax credits	$	37.5	$	28.9	$	37.5	$	28.9	2021
Louisiana inventory credits	$	0.1	$	0.1	$	—	$	—	2032

N/A - not applicable

Oklahoma Corporate Tax Rate Change

In May 2021, Oklahoma enacted a reduction of the corporate income tax rate to four percent from the previous six percent. This rate reduction took effect on January 1, 2022. ASC 740, "Income Taxes," requires deferred tax assets and liabilities to be measured at the enacted tax rate expected to apply when temporary differences are to be realized or settled. Therefore, during the second quarter of 2021, the Registrants revalued state deferred tax liabilities to reflect this change in tax rate. For entities subject to ASC 980, "Accounting for Regulated Entities," such as OG&E, those entities are required to recognize a regulatory liability for the decrease in taxes payable for the change in tax rates that are expected to be returned to customers through future rates and to recognize a regulatory asset for the increase in taxes receivable for the change in tax rates that are expected to be recovered from customers through future rates. The revaluation resulted in a regulatory liability of $97.7 million recorded for OG&E and an income tax benefit of $6.6 million for OGE Energy related to Enable and other operations (holding company) for the year ended December 31, 2021.

Income Taxes

12 Months Ended

Dec. 31, 2021

Income Taxes [Abstract]

Income Tax Disclosure [Text Block]

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)	2021		2020		2019		2021		2020		2019
Provision (benefit) for current income taxes:
Federal	$	16.4	$	8.4	$	(6.4)	$	(9.0)	$	(3.8)	$	(7.9)
State	1.7		0.5		5.1		9.0		(0.6)		4.1
Total provision (benefit) for current income taxes	18.1		8.9		(1.3)		—		(4.4)		(3.8)
Provision (benefit) for deferred income taxes, net:
Federal	133.1		(105.2)		48.5		58.3		45.7		37.7
State	(10.0)		(31.1)		(17.4)		(16.5)		(6.6)		(13.8)
Total provision (benefit) for deferred income taxes, net	123.1		(136.3)		31.1		41.8		39.1		23.9

Total income tax expense (benefit)	$	141.2	$	(127.4)	$	29.8	$	41.8	$	34.7	$	20.1

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 2018. 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 utility property have been deferred and will be amortized to income over the life of the related property. Additionally, OG&E earns federal tax credits associated with production from its wind facilities. Oklahoma production and investment state tax credits are also earned on investments in electric and solar 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	2021		2020		2019		2021		2020		2019
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	0.9		(1.4)		(1.2)		(1.4)		(1.6)		(1.8)
Stock-based compensation	0.1		(0.3)		(1.2)		—		—		—
Executive compensation limitation	0.1		0.2		0.2		—		—		—
Amortization of net unfunded deferred taxes	(2.1)		(4.4)		(4.5)		(4.6)		(4.8)		(5.6)
Federal renewable energy credit (A)	(2.0)		(5.0)		(6.0)		(4.4)		(5.4)		(7.6)
Remeasurement of state deferred taxes due to Energy Transfer merger (B)	(1.1)		—		—		—		—		—
Remeasurement of state deferred tax liabilities	(0.6)		0.9		(0.8)		—		—		—
401(k) dividends	(0.2)		(0.4)		(0.4)		—		—		—
Impairment of OGE Energy's investment in Enable (C)	—		31.6		—		—		—		—
Other	—		0.1		(0.7)		(0.2)		0.1		(0.6)


Effective income tax rate	16.1	%	42.3	%	6.4	%	10.4	%	9.3	%	5.4	%

(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, 2021 and 2020.
















	OGE Energy				OG&E
December 31 (In millions)	2021		2020		2021		2020
Deferred income tax liabilities, net:
Accelerated depreciation and other property related differences	$	1,677.3	$	1,721.2	$	1,677.3	$	1,721.2

Investment in Enable	—		302.6		—		—
Investment in Energy Transfer's equity securities	363.5		—		—		—
Regulatory assets	52.1		52.3		52.1		52.3
Pension Plan	10.7		3.9		32.0		27.4
Other	7.4		(1.4)		(4.7)		(6.5)
Derivative instruments	2.2		1.7		—		—
Bond redemption-unamortized costs	1.8		2.0		1.8		2.0


Income taxes recoverable from customers, net	(225.8)		(221.8)		(225.8)		(221.8)
State tax credits	(221.2)		(204.4)		(205.9)		(189.0)
Federal tax credits	(208.4)		(236.6)		(209.8)		(236.6)
Regulatory liabilities	(72.0)		(81.0)		(72.0)		(81.0)
Asset retirement obligations	(19.4)		(20.3)		(19.4)		(20.3)
Postretirement medical and life insurance benefits	(19.2)		(22.4)		(13.0)		(15.3)
Accrued liabilities	(9.5)		(9.6)		(7.3)		(5.2)
Deferred federal investment tax credits	(3.1)		(2.7)		(3.1)		(2.7)
Net operating losses	(1.0)		(12.0)		—		(1.4)
Accrued vacation	(1.5)		(2.2)		(1.2)		(1.6)
Uncollectible accounts	(0.6)		(0.7)		(0.6)		(0.7)

Total deferred income tax liabilities, net	$	1,333.3	$	1,268.6	$	1,000.4	$	1,020.8

As of December 31, 2021, the Registrants have classified $18.1 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, 2021, 2020 and 2019.


(In millions)	2021		2020		2019
Balance at January 1	$	21.9	$	20.7	$	20.7
Tax positions related to current year:
Additions	1.7		1.2		—

Reductions	(1.2)		—		—
Balance at December 31	$	22.4	$	21.9	$	20.7

As of December 31, 2021, 2020 and 2019, there were $18.1 million, $17.6 million and $16.4 million, respectively, of unrecognized tax benefits that, if recognized, would affect the annual effective tax rate.

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

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 September 2021, the Registrants recorded an additional reserve for certain federal

research and development credits in the amount of $1.7 million. The $1.2 million reserve recorded in 2020 was reversed upon completion of the audit.

The Registrants sustained federal and state tax operating losses through 2012 caused primarily by bonus depreciation and other book versus tax temporary differences. Federal net operating losses generated during those years have been fully utilized. State operating losses are being carried forward for utilization in future years. In addition to the tax operating losses, the Registrants were unable to utilize the various tax credits that were generated during those years. These tax losses and credits are being carried as deferred tax assets and will be utilized in future periods. Under current law, the Registrants anticipate future taxable income will be sufficient to utilize remaining losses and credits before they begin to expire after 2021. The following table presents a summary of these carry forwards.


	OGE Energy				OG&E
(In millions)	Carry Forward Amount		Deferred Tax Asset		Carry Forward Amount		Deferred Tax Asset		Earliest Expiration Date

State operating loss	$	33.4	$	1.0	$	—	$	—	2032
Federal tax credits	$	208.4	$	208.4	$	209.8	$	209.8	2032
State tax credits:
Oklahoma investment tax credits	$	227.1	$	179.4	$	207.8	$	164.2	N/A
Oklahoma capital investment board credits	$	12.8	$	12.8	$	12.8	$	12.8	N/A
Oklahoma zero emission tax credits	$	37.5	$	28.9	$	37.5	$	28.9	2021
Louisiana inventory credits	$	0.1	$	0.1	$	—	$	—	2032

N/A - not applicable

Oklahoma Corporate Tax Rate Change

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.

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Investment in Unconsolidated Affiliate Summarized Balance Sheet Information of Equity Method Investment (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 02, 2021	Dec. 31, 2020
Summarized Financial Information of Equity Method Investment [Line Items]
Assets, Current	$ 605.1		$ 685.6
Liabilities, Current	$ 575.8		495.9
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Summarized Financial Information of Equity Method Investment [Line Items]
Assets, Current		$ 594.0	381.0
Assets, Noncurrent		11,227.0	11,348.0
Liabilities, Current		1,254.0	582.0
Liabilities, Noncurrent		$ 3,281.0	$ 4,052.0

Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Commitments and Contingencies Disclosure [Abstract]

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Premium on Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Common Stock, Shares, Outstanding		40,400,000
Comprehensive income (loss)
Treasury Stock, Common, Shares						0
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares		0				0
Balance at Dec. 31, 2018	$ 4,005.1	$ 2.0	$ 1,125.7	$ 2,906.3	$ (28.9)	$ 0.0
Comprehensive income (loss)
Net income (loss)	433.6	$ 0.0	0.0	433.6	0.0	$ 0.0
Other Comprehensive Income (Loss), Net of Tax, Number of Shares		0				0
Other Comprehensive Income (Loss), Net of Tax	0.0	$ 0.0	0.0	0.0	1.0	$ 0.0
Dividends, Common Stock, Cash, Number of Shares		0				0
Dividends declared on common stock	$ (303.8)	$ 0.0	0.0	(303.8)	0.0	$ 0.0
Stock Issued During Period, Shares, New Issues	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares		0				0
Stock-based compensation	$ 4.8	$ 0.0	4.8	0.0	0.0	$ 0.0
Balance at Dec. 31, 2019	$ 4,139.5	$ 2.0	1,129.3	3,036.1	(27.9)	$ 0.0
Comprehensive income (loss)
DIVIDENDS DECLARED PER COMMON SHARE	$ 1.5050
Common Stock, Shares, Outstanding		40,400,000
Treasury Stock, Common, Shares						0
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares		0				0
Net income (loss)	$ (173.7)	$ 0.0	0.0	(173.7)	0.0	$ 0.0
Other Comprehensive Income (Loss), Net of Tax, Number of Shares		0				0
Other Comprehensive Income (Loss), Net of Tax	0.0	$ 0.0	0.0	0.0	(4.2)	$ 0.0
Dividends, Common Stock, Cash, Number of Shares		0				0
Dividends declared on common stock	(317.8)	$ 0.0	0.0	(317.8)	0.0	$ 0.0
Treasury Stock, Value, Acquired, Cost Method	$ (14.7)	$ 0.0	0.0	0.0	0.0	$ (14.7)
Stock Issued During Period, Shares, New Issues	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares		0				(300,000)
Stock-based compensation	$ (2.9)	$ 0.0	(2.9)	0.0	0.0	$ 9.4
Balance at Dec. 31, 2020	$ 3,631.8	$ 2.0	1,122.6	2,544.6	(32.1)	$ (5.3)
Comprehensive income (loss)
DIVIDENDS DECLARED PER COMMON SHARE	$ 1.5800
Treasury Stock, Shares, Acquired		0				400,000
Common Stock, Shares, Outstanding	40,400,000	40,400,000
Treasury Stock, Common, Shares	100,000					100,000
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares		0				0
Net income (loss)	$ 737.3	$ 0.0	0.0	737.3	0.0	$ 0.0
Other Comprehensive Income (Loss), Net of Tax, Number of Shares		0				0
Other Comprehensive Income (Loss), Net of Tax	0.0	$ 0.0	0.0	0.0	7.3	$ 0.0
Dividends, Common Stock, Cash, Number of Shares		0				0
Dividends declared on common stock	$ (326.5)	$ 0.0	0.0	(326.5)	0.0	$ 0.0
Stock Issued During Period, Shares, New Issues	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares		0				(100,000)
Stock-based compensation	$ 2.2	$ 0.0	2.2	0.0	0.0	$ 5.2
Balance at Dec. 31, 2021	$ 4,056.3	$ 2.0	$ 1,123.8	$ 2,955.4	$ (24.8)	$ (0.1)
Comprehensive income (loss)
DIVIDENDS DECLARED PER COMMON SHARE	$ 1.6250
Treasury Stock, Shares, Acquired	405,000
Common Stock, Shares, Outstanding	40,400,000	40,400,000
Treasury Stock, Common, Shares	0.0					0

Commitments and Contingencies

12 Months Ended

Dec. 31, 2021

Commitments and Contingencies

Public Utility Regulatory Policy Act of 1978

OG&E had QF contracts with AES-Shady Point, Inc. and Oklahoma Cogeneration LLC, which expired in January and August 2019, respectively. For the 320 MW AES-Shady Point, Inc. QF contract and the 120 MW Oklahoma Cogeneration LLC QF contract, OG&E purchased 100 percent of the electricity generated by the qualified cogeneration facilities.

In 2019, OG&E acquired the plants from AES-Shady Point, Inc. and Oklahoma Cogeneration LLC. Previous to such acquisitions, OG&E made total payments to cogenerators of $14.7 million, of which $7.4 million represented capacity payments. All payments for purchased power, including cogeneration, are included in the Registrants' statements of income as Fuel, Purchased Power and Direct Transmission Expense.

Purchase Obligations and Commitments

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


(In millions)	2022		2023		2024		2025		2026		Total
Purchase obligations and commitments:
Minimum purchase commitments	$	97.7	$	50.4	$	31.2	$	24.6	$	24.6	$	228.5
Expected wind purchase commitments	55.6		56.0		56.6		56.9		57.4		282.5
Long-term service agreement commitments	2.7		2.6		15.0		24.4		9.7		54.4


Total purchase obligations and commitments	$	156.0	$	109.0	$	102.8	$	105.9	$	91.7	$	565.4

OG&E Minimum Purchase Commitments

OG&E has coal contracts for purchases through December 31, 2022, whereby OG&E has the right but not the obligation to purchase a defined quantity of coal. 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. The contracts with Energy Transfer end in May 2024 and December 2038; the contracts with ONEOK, Inc. end in March 2024 and August 2037; and the contract with Southern Star ends in June 2024. These transportation contracts grant Energy Transfer, ONEOK, Inc. and Southern Star the responsibility of delivering natural gas to OG&E's generating facilities.

OG&E Wind Purchase Commitments

The following table presents OG&E's wind power purchase 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, 2021, 2020 and 2019.


Year Ended December 31 (In millions)	2021		2020		2019
CPV Keenan	$	27.3	$	27.5	$	27.2
Edison Mission Energy	21.7		22.8		23.1
NextEra Energy	6.8		7.0		7.4

Total wind power purchased	$	55.8	$	57.3	$	57.7

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. In December 2015, the McClain Long-Term Service Agreement was amended to define the terms and conditions for the exchange of spare rotors between OG&E and General Electric International, Inc. Based on historical usage and current expectations for future usage, this contract is expected to run until 2033. 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.

Environmental Laws and Regulations

The activities of the Registrants 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.

CO2 Emission Limits for Existing Generating Units

On January 19, 2021, the U.S. Court of Appeals vacated the EPA's latest effort to adopt CO2 emissions standards for existing coal-fired electric generating units, and the court remanded the matter to the EPA for further consideration. The EPA has indicated that administrative proceedings to respond to the U.S. Court of Appeals' remand in a new rulemaking action are ongoing but has not announced rulemaking details. The decision was based on the court's conclusion that the Clean Air Act does not require the EPA to limit the standards to measures that can be applied at and to an existing unit. On October 29, 2021, the U.S. Supreme Court granted petitions to review the decision; oral arguments before the Supreme Court are scheduled for February 28, 2022. The ultimate timing and impact of these standards on OG&E's operations cannot be determined with certainty at this time, although a requirement for significant reduction of CO2 emissions from existing fossil-fuel-fired power plants ultimately could result in significant additional compliance costs that would affect the Registrants' future financial position, results of operations and cash flows if such costs are not recovered through regulated rates.

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. 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.

Summary of Significant Accounting Policies Allowance for Funds Used During Construction (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Public Utilities, Allowance for Funds Used During Construction, Rate	7.40%	7.30%	7.60%

Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

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 Utility) Results of Operations" within "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations."




	Year Ended December 31,
(In millions)	2021		2020		2019
Residential	$	1,309.1	$	842.7	$	865.8
Commercial	749.2		465.6		486.6
Industrial	323.0		192.6		217.8
Oilfield	312.8		169.2		200.4
Public authorities and street light	284.4		172.3		190.3
System sales revenues	2,978.5		1,842.4		1,960.9
Provision for rate refund	—		3.8		(0.9)
Integrated market	468.9		49.6		38.4
Transmission	140.2		143.3		148.0
Other	1.1		30.7		29.1
Revenues from contracts with customers (A)	$	3,588.7	$	2,069.8	$	2,175.5

(A)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. Operating revenues significantly increased due to increased fuel, purchased power and direct transmission expenses, which are generally recoverable from customers, as a result of Winter Storm Uri. For further discussion, see Note 16 and "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations."

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

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

$ 6.1

0.0

Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation

6.1

72.8

67.3

Capitalized Computer Software, Gross

103.7

89.7

Capitalized Computer Software, Amortization

$ 18.1

$ 14.9

$ 11.0

Provision for Depreciation Rate

2.60%

McClain Plant [Member]

Jointly Owned Utility Plant, Proportionate Ownership Share

77.00%

^[1]

77.00%

^[2]

$ 258.5

^[1]

$ 257.1

^[2]

109.0

^[1]

96.0

^[2]

Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress

149.5

^[1]

161.1

^[2]

$ 0.2

$ 0.1

Redbud Plant [Member]

Jointly Owned Utility Plant, Proportionate Ownership Share

51.00%

^[1],[3]

51.00%

^[2],[4]

$ 538.2

^[1],[3]

$ 531.8

^[2],[4]

203.4

^[1],[3]

181.9

^[2],[4]

Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress

334.8

^[1],[3]

349.9

^[2],[4]

0.2

1.8

Amount of Acquisition Adjustments

148.3

Total Property Plant and Equipment [Member]

14,145.7

13,436.1

4,318.9

4,067.6

Electric Transmission and Distribution [Member]

9,826.8

9,368.5

5,225.8

4,809.9

1,477.5

1,422.1

Electric Generation Equipment [Member]

3,748.3

3,387.8

5,037.9

^[5]

4,932.2

^[6]

1,839.0

^[5]

1,713.6

^[6]

Amount of Acquisition Adjustments

3,198.9

^[5]

3,218.6

^[6]

148.3

Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation

72.8

67.3

Electric Transmission [Member]

3,038.2

^[7]

2,944.6

^[8]

627.0

^[7]

591.7

^[8]

Amount of Acquisition Adjustments

2,411.2

^[7]

2,352.9

^[8]

3.3

Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation

0.9

Finite-Lived Intangible Assets, Major Class Name [Member]

301.1

254.1

171.7

153.9

Property, Plant and Equipment, Other Types [Member]

129.4

100.2

542.7

495.3

203.7

186.3

$ 339.0

$ 309.0

[1]	Construction work in progress was $0.2 million and $0.2 million for the McClain and Redbud Plants, respectively.
[2]	Construction work in progress was $0.1 million and $1.8 million for the McClain and Redbud Plants, respectively.
[3]	This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $72.8 million.
[4]	This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $67.3 million.
[5]	This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $72.8 million.
[6]	This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $67.3 million.
[7]	This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.9 million.
[8]	This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.9 million.

Leases, Codification Topic 842

12 Months Ended

Dec. 31, 2021

Leases [Abstract]

Lessee, Operating Leases

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.

Operating Leases

OG&E Railcar Lease Agreement

Effective February 1, 2019, OG&E renewed a railcar lease agreement for 780 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, 2024, 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 and the actual fair value of the railcars is less than the stipulated fair market value, OG&E would be responsible for the difference in those values up to a maximum of $6.8 million.

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 25 to 30 years. 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 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' income statements, cash flow statements 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)	2021		2020		2019		2021		2020		2019












Operating lease cost	$	6.3	$	6.4	$	6.0	$	5.7	$	5.5	$	5.1
Cash paid for amounts included in the measurement of lease liabilities:

Operating cash flows for operating leases	$	6.3	$	6.4	$	5.6	$	5.7	$	5.5	$	4.8

Right-of-use assets obtained in exchange for new operating lease liabilities	$	—	$	1.4	$	10.7	$	—	$	1.4	$	10.7


	OGE Energy						OG&E
(Dollars in millions)	December 31, 2021			December 31, 2020			December 31, 2021			December 31, 2020
Right-of-use assets at period end (A)	$	33.0		$	37.6		$	33.0		$	37.0
Operating lease liabilities at period end (B)	$	37.6		$	42.3		$	37.6		$	41.7
Operating lease weighted-average remaining lease term (in years)	12.2			12.5			12.2			12.7
Operating lease weighted-average discount rate	3.9		%	3.9		%	3.9		%	3.9		%

(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)

2022	$	5.7	$	5.7
2023	5.1		5.1
2024	3.1		3.1
2025	3.0		3.0
2026	3.0		3.0
Thereafter	28.7		28.7
Total future minimum lease payments	48.6		48.6
Less: Imputed interest	11.0		11.0
Present value of net minimum lease payments	$	37.6	$	37.6

Fair Value Measurements

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements

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).

OG&E had no financial instruments measured at fair value on a recurring basis at December 31, 2021 and 2020. The following table presents OGE Energy's financial instrument measured at fair value on a recurring basis and the carrying amount and fair value of the Registrants' financial instruments at December 31, 2021 and 2020, as well as the classification level within the fair value hierarchy.


	2021				2020
December 31 (In millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Classification
Financial instrument measured at fair value on a recurring basis:
OGE Energy investment in Energy Transfer's equity securities	$	785.1	$	785.1	(A)		(A)		Level 1

Financial instruments for which fair value is only disclosed:
Long-term Debt (including Long-term Debt due within one year):
OGE Energy Senior Notes	$	499.9	$	497.8	$	—	$	—	Level 2
OG&E Senior Notes	$	3,851.8	$	4,460.2	$	3,349.6	$	4,182.1	Level 2
OG&E Industrial Authority Bonds	$	135.4	$	135.4	$	135.4	$	135.4	Level 2
Tinker Debt	$	9.3	$	10.0	$	9.4	$	10.7	Level 3

(A)OGE Energy's ownership of Energy Transfer securities was effective as of December 2, 2021; therefore, the investment in Energy Transfer's equity securities was not held at December 31, 2020.

Nonrecurring Fair Value Measurements

As further discussed in Note 5, OGE Energy recorded an impairment on its investment in Enable in March 2020. The nonrecurring fair value measurement consisted of calculating a 20-trading day volume weighted average price for Enable's common units through March 31, 2020. This method of valuation was determined to be representative of the fair value of Enable's common units as it incorporated market prices during the period and reduced the impact of volatility that a single day could represent. OGE Energy concluded that this valuation method resulted in a Level 3 nonrecurring fair value measurement.

Organization, Consolidation and Presentation of Financial Statements [Abstract]

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 (Policies)

12 Months Ended

Dec. 31, 2021

Consolidation, Policy [Policy Text Block]

Organization

OGE Energy is a holding company with investments in energy and energy services providers offering physical delivery and related services for electricity in Oklahoma and western Arkansas and natural gas, crude oil and NGLs across the U.S. OGE Energy conducts these activities through two business segments: (i) electric utility and (ii) natural gas midstream operations. 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. OGE Energy generally uses the equity method of accounting for investments where its ownership interest is between 20 percent and 50 percent and it lacks the power to direct activities that most significantly impact economic performance.

Electric Utility Operations. OGE Energy's electric utility operations are conducted through OG&E, which generates, transmits, distributes and sells electric energy in Oklahoma and western Arkansas. 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 a wholly-owned subsidiary of OGE Energy. OG&E is the largest electric utility in Oklahoma, and its franchised service territory 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.

Natural Gas Midstream Operations. In February 2021, Enable entered into a definitive merger agreement with Energy Transfer, pursuant to which all outstanding common units of Enable were to be acquired by Energy Transfer in an all-equity transaction. The transaction closed on December 2, 2021, and under the terms of the merger agreement, OGE Energy received 95,389,721 common units of Energy Transfer for OGE Energy’s 110,982,805 common units of Enable. As part of the transaction, Energy Transfer also acquired the general partner interests of Enable from OGE Energy and CenterPoint for cash consideration. Upon the transaction closing, OGE Energy owned approximately three percent of Energy Transfer's outstanding limited partner units in lieu of the 25.5 percent interest in Enable that it previously owned. For periods prior to December 2, 2021, OGE Energy's natural gas midstream operations segment represented OGE Energy's investment in Enable, which OGE Energy accounted for as an equity method investment. Formed in 2013, Enable was primarily engaged in the business of gathering, processing, transporting and storing natural gas primarily in the south central U.S. For further discussion regarding

Enable's business, see OGE Energy's 2020 Form 10-K. Upon the closing of the Energy Transfer and Enable merger, OGE Energy's natural gas midstream operations segment represents OGE Energy's investment in Energy Transfer's equity securities and legacy Enable seconded employee pension and postretirement costs. The investment in Energy Transfer's equity securities is held through wholly-owned subsidiaries and ultimately OGE Holdings. At December 31, 2021, OGE energy owned 95.4 million, or approximately three percent, of Energy Transfer's limited partner units. OGE Energy does not have significant influence over Energy Transfer, as OGE Energy does not own general partner units in or have board representation at Energy Transfer. As such, OGE Energy accounts for its investment in Energy Transfer as an investment in equity securities, as further discussed under "Investment in Equity Securities of Energy Transfer" below. OGE Energy intends to exit the midstream segment in a prudent manner.

Public Utilities, Policy [Policy Text Block]

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 utility, 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.

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, Policy [Policy Text Block]

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 Plan assumptions, income taxes, contingency reserves, asset retirement obligations, regulatory assets and liabilities, unbilled revenues and the allowance for uncollectible accounts receivable.

Cash and Cash Equivalents, Policy [Policy Text Block]

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, Policy

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, such as in response to COVID-19 impacts. 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 $2.4 million and $2.6 million at December 31, 2021 and 2020, 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.

Inventory, Policy [Policy Text Block]

Fuel Inventories

Fuel inventories for the generation of electricity consist of coal, natural gas and oil. OG&E uses the weighted-average cost method of accounting for inventory that is physically added to or withdrawn from storage or stockpiles. The amount of fuel inventory was $40.6 million and $36.5 million at December 31, 2021 and 2020, respectively.

Property, Plant and Equipment, Policy [Policy Text Block]

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.

Depreciation and Amortization, Policy [Policy Text Block]

Depreciation and Amortization

The provision for depreciation, which was 2.6 percent of the average depreciable utility plant for both 2021 and 2020, is calculated using the straight-line method over the estimated service life of the utility 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 2022, the provision for depreciation is projected to be 2.6 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, 2021, 99.1 percent will be amortized over 10.4 years with the remaining 0.9 percent of the intangible plant balance at December 31, 2021 being amortized over 23.7 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.

Equity Method Investments [Policy Text Block]

Investment in Unconsolidated Affiliates

Prior to December 2, 2021, OGE Energy's investment in Enable was considered to be a variable interest entity because the owners of the equity at risk in the entity had disproportionate voting rights in relation to their obligations to absorb the entity's expected losses or to receive its expected residual returns. However, OGE Energy was not considered the primary beneficiary of Enable since it did not have the power to direct the activities of Enable that are considered most significant to the economic performance of Enable; therefore, OGE Energy accounted for its investment in Enable using the equity method of accounting. Under the equity method, the investment was adjusted each period for contributions made, distributions received and OGE Energy's share of the investee's comprehensive income as adjusted for basis differences.

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 are classified as operating activities in the statements of cash flows. OGE Energy considered distributions received from Enable in excess of cumulative equity in earnings subsequent to the date of investment to be a return of investment and are classified as investing activities in the statements of cash flows.

Asset Retirement Obligation [Policy Text Block]

Asset Retirement ObligationsOG&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 five to 68 years. Asset retirement obligations are included in Other Deferred Credits in the Registrants' balance sheets.

Allowance for Funds Used During Construction, Policy [Policy Text Block]

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 7.4 percent, 7.3 percent and 7.6 percent for the years ended December 31, 2021, 2020 and 2019, respectively.

Collection of Sales Tax, Policy [Policy Text Block]

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, Policy [Policy Text Block]

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 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, Policy [Policy Text Block]

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.

Actual fuel costs from Winter Storm Uri are recoverable from OG&E's customers through securitization of regulatory assets. Both the OCC and the APSC allowed OG&E to create a regulatory asset for each jurisdictional portion of all deferred costs, as further discussed above within "Accounting Records." For additional information on Oklahoma securitization, see Note 16.

Lessee, Leases

LeasesThe 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, Policy [Policy Text Block]

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 utility 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.

Accrued Vacation, Policy [Policy Text Block]

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.

Environmental Costs, Policy [Policy Text Block]

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 $25.8 million and $25.0 million in accrued environmental liabilities at December 31, 2021 and 2020, respectively, which are included in OG&E's asset retirement obligations.

Fair Value of Financial Instruments, Policy [Policy Text Block]

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.

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.

OG&E had no financial instruments measured at fair value on a recurring basis at December 31, 2021 and 2020.

Share-based Compensation, Option and Incentive Plans, Policy [Policy Text Block]

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 based on total shareholder return 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. The performance units granted based on earnings per share were contingently awarded and will be payable in shares of OGE Energy's common stock based on OGE Energy's earnings per share growth over a primarily three-year award cycle (i.e., three-year cliff vesting period) compared to a target set at the time of the grant by the Compensation Committee of OGE Energy's Board of Directors. All of 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.

Performance Units – Total Shareholder Return

The fair value of the performance units based on total shareholder return 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 based on total shareholder return.Performance Units – Earnings Per ShareIn 2019, the Compensation Committee of OGE Energy's Board of Directors voted to grant restricted stock units in lieu of performance units based on earnings per share. The last outstanding grant of performance units based on earnings per share paid out during 2021. Prior to payout, OGE Energy reassessed at each reporting date whether achievement of the performance condition was probable and accrued compensation expense if and when achievement of the performance condition was probable. As a result, the compensation expense recognized for these performance units varied from period to period. There are no post-vesting restrictions related to OGE Energy's performance units based on earnings per share.

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, and as of the 2019 grant cycle, restricted stock units are granted in lieu of performance units based on earnings per share. 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.

Earnings Per Share, Policy [Policy Text Block]

Earnings (Loss) Per Share

Basic earnings (loss) per share is calculated by dividing net income (loss) 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 (loss) 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.

Pension and Other Postretirement Plans, Policy [Policy Text Block]

Pension Plan and Restoration of Retirement Income Plan

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

Postretirement Benefit Plans

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.

Postemployment Benefit Plans, Policy [Policy Text Block]

Post-Employment Benefit Plan

Plan Investments, Policies and Strategies, Policy [Policy Text Block]

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%

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	l Maximize risk-adjusted performance while providing long bond exposure managed according to the manager's forecast on interest rates. l All invested assets must reach at or above Baa3 or BBB- investment grade. l 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	l Maximize risk-adjusted performance. l At least 75 percent of invested assets much reach at or above Baaa3 or BBB- investment grade. l Limited five percent exposure to any single issuer, except the U.S. Government or affiliates. l May invest up to 10 percent of the market value in convertible bonds as long as quality guidelines are met. l 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	l Focus on replicating the performance of the S&P 500 Index.


Mid-Cap Equity (B)(C)	Russell Midcap Index Russell Midcap Value Index	l Focus on undervalued stocks expected to earn average return and pay out higher than average dividends. l Invest in companies with market capitalizations lower than average company on public exchanges: l Price/earnings ratio at or near referenced index; l Small dividend yield and return on equity at or near referenced index; and l Earnings per share growth rate at or near referenced index.

Small-Cap Equity (B)(C)	Russell 2000 Index Russell 2000 Value Index

International Equity (D)	Morgan Stanley Capital International ACWI ex-U.S.	l Invest in non-dollar denominated equity securities. l 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.

Pension and Other Postretirement Plans, Nonpension Benefits, Policy [Policy Text Block]

401(k) Plan

Deferred Compensation Plan

Accounting Pronouncements	12 Months Ended
Accounting Pronouncements	Dec. 31, 2021
Accounting Pronouncement [Abstract]
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	Accounting PronouncementsThe Registrants believe that 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.

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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Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers (Notes)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Text Block]

Revenue Recognition




	Year Ended December 31,
(In millions)	2021		2020		2019
Residential	$	1,309.1	$	842.7	$	865.8
Commercial	749.2		465.6		486.6
Industrial	323.0		192.6		217.8
Oilfield	312.8		169.2		200.4
Public authorities and street light	284.4		172.3		190.3
System sales revenues	2,978.5		1,842.4		1,960.9
Provision for rate refund	—		3.8		(0.9)
Integrated market	468.9		49.6		38.4
Transmission	140.2		143.3		148.0
Other	1.1		30.7		29.1
Revenues from contracts with customers (A)	$	3,588.7	$	2,069.8	$	2,175.5

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.

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-Paragraph 12
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045

Report of Business Segments (Details) - USD ($)
$ in Millions

11 Months Ended

12 Months Ended

Dec. 02, 2021

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Fuel, purchased power and direct transmission expense

$ 3,653.7

$ 2,122.3

$ 2,231.6

2,127.6

644.6

786.9

464.7

464.4

492.5

416.0

391.3

355.0

99.3

97.2

89.5

546.1

524.8

507.7

$ 169.8

^[1]

169.8

(668.0)

^[1],[2]

113.9

^[1]

(21.6)

3.2

(6.9)

152.0

154.8

140.5

41.8

34.7

20.1

NET INCOME ATTRIBUTABLE TO OGE ENERGY

737.3

(173.7)

433.6

360.0

339.4

350.2

0.0

374.3

1,132.9

11,688.0

10,489.0

11,024.3

Equity Method Investment, Other than Temporary Impairment

778.5

650.5

635.5

^[3]

$ 0.0

(780.0)

0.0

Electric Utility [Member]

344.4

0.0

Fuel, purchased power and direct transmission expense

3,653.7

2,122.3

2,231.6

2,127.6

644.6

786.9

464.7

464.4

492.5

416.0

391.3

355.0

99.3

97.2

89.5

546.1

524.8

507.7

0.0

^[2]

0.0

7.7

4.1

3.1

152.0

154.8

140.5

41.8

34.7

20.1

360.0

339.4

350.2

0.0

11,688.0

10,489.0

10,076.6

778.5

650.5

635.5

Natural Gas Midstream Operations [Member]

0.0

Fuel, purchased power and direct transmission expense

0.0

0.0

1.6

1.7

2.8

0.0

0.2

0.4

(1.8)

(2.1)

(3.2)

169.8

(668.0)

^[2]

113.9

(26.4)

(2.9)

(8.6)

0.0

101.0

(158.0)

20.7

385.0

(515.0)

81.4

374.3

1,132.9

786.6

378.1

1,135.4

0.0

Other Operations [Member]

344.4

Fuel, purchased power and direct transmission expense

0.0

0.0

(3.2)

(3.3)

(3.5)

0.0

3.3

3.8

3.7

(0.1)

(0.5)

(0.2)

0.0

^[2]

0.0

(2.0)

3.6

2.2

7.2

5.3

11.0

(1.6)

(4.1)

(11.0)

(7.7)

1.9

2.0

0.0

350.3

116.4

107.0

0.0

0.0

Eliminations [Member]

Fuel, purchased power and direct transmission expense

0.0

0.0

0.0

0.0

0.0

0.0

0.0

^[2]

0.0

(0.9)

(1.6)

(3.6)

(0.9)

(1.6)

(3.6)

0.0

0.0

0.0

(218.5)

(264.7)

(294.7)

0.0

$ 0.0

Revenue from Contract with Customer, Excluding Assessed Tax

$ 0.0

[1]	For the year ended December 31, 2020, Enable recorded a $225.0 million impairment on its SESH equity method investment. Enable estimated the fair value of this equity method investment was below the carrying value at September 30, 2020 and concluded the decline in value was other than temporary due to the expiration of a transportation contract and the current status of renewal negotiations. The impairment ran through OGE Energy's portion of Enable net income and was offset by basis differences that flow through the amortization of basis difference and dilution recognition line item above
[2]	In March 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Notes 5 and 7.
[3]	Effective March 31, 2020, OGE Energy estimated the fair value of its investment in Enable was below the book value and concluded the decline in value was not temporary due to the severity of the decline and recent rapid deterioration, as well as the near term future outlook, of the midstream oil and gas industry. Accordingly, OGE Energy recorded a $780.0 million impairment on its investment in Enable in 2020. Further information concerning the fair value method used to measure the impairment on OGE Energy's investment in Enable can be found in Note 7.

CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Millions, $ in Millions

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

$ 3,588.7

$ 2,069.8

$ 2,175.5

Revenues from Alternative Revenue Programs

65.0

52.5

56.1

OPERATING REVENUES

Total operating revenues

3,653.7

2,122.3

2,231.6

Total cost of sales

2,127.6

644.6

786.9

OPERATING EXPENSES

464.7

464.4

492.5

416.0

391.3

355.0

99.3

97.2

89.5

Operating expenses

980.0

952.9

937.0

Equity in earnings (losses) of unconsolidated affiliates

546.1

524.8

507.7

OTHER INCOME (EXPENSE)

169.8

(668.0)

^[1],[2]

113.9

^[1]

Allowance for equity funds used during construction

6.7

4.8

4.5

Pension and Other Postretirement Benefits Cost (Reversal of Cost)

(4.3)

(3.1)

(1.2)

Equity Securities, FV-NI, Gain (Loss)

(8.6)

0.0

Other income

7.1

5.0

6.7

Net other income (expense)

344.4

0.0

Other expense

(1.8)

(2.6)

(6.9)

7.7

4.1

3.1

INTEREST EXPENSE

Interest on long-term debt

152.7

152.8

138.3

Allowance for borrowed funds used during construction

(3.5)

(1.9)

(2.8)

Interest on short-term debt and other interest charges

2.8

3.9

5.0

INCOME (LOSS) BEFORE TAXES

152.0

154.8

140.5

401.8

374.1

370.3

INCOME TAX EXPENSE (BENEFIT)

41.8

34.7

20.1

BASIC AVERAGE COMMON SHARES OUTSTANDING

$ 737.3

$ (173.7)

$ 433.6

200.1

DILUTED AVERAGE COMMON SHARES OUTSTANDING

200.3

200.1

200.7

BASIC EARNINGS (LOSS) PER AVERAGE COMMON SHARE

$ 3.68

$ (0.87)

$ 2.17

DILUTED EARNINGS (LOSS) PER AVERAGE COMMON SHARE

3.68

(0.87)

2.16

DIVIDENDS DECLARED PER COMMON SHARE

$ 1.6250

$ 1.5800

$ 1.5050

Net Income (Loss) Attributable to Parent

$ 360.0

$ 339.4

$ 350.2

Comprehensive Income (Loss), Net of Tax, Attributable to Parent

0.0

$ 360.0

$ 339.4

$ 350.2

[1]

[2]

In March 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Notes 5 and 7.

Commitments and Contingencies (Details) $ in Millions	12 Months Ended
Commitments and Contingencies (Details) $ in Millions	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 156.0
Operating Leases, Future Minimum Payments, Due in Two Years	109.0
Operating Leases, Future Minimum Payments, Due in Three Years	102.8
Operating Leases, Future Minimum Payments, Due in Four Years	105.9
Operating Leases, Future Minimum Payments, Due in Five Years	91.7
Operating Leases, Future Minimum Payments Due	565.4
Purchase Obligation, Due in Next Twelve Months	2.7
Unrecorded Unconditional Purchase Obligation, Due within Two Years	2.6
Unrecorded Unconditional Purchase Obligation, Due within Three Years	15.0
Unrecorded Unconditional Purchase Obligation, Due within Four Years	24.4
Unrecorded Unconditional Purchase Obligation, Due within Five Years	9.7
Utilities Operating Expense, Purchased Power under Long-term Contracts	$ 55.8	$ 57.3	$ 57.7
OG&E long-term service agreement commitments [Member]
Loss Contingencies [Line Items]
Factored-Fired Hours	144,000
Factored-Fired Starts	4,500
Additional Factored-Fired Hours	24,000

Summary of Significant Accounting Policies Enviromental Costs (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Accrued Environmental Loss Contingencies, Noncurrent	$ 25.8	$ 25.0

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

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

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

Accumulated other comprehensive (income) loss

$ (24.8)

$ (32.1)

$ (27.9)

Other Comprehensive Income (Loss), before Reclassifications, Net of Tax

0.9

(8.2)

Amounts reclassified from accumulated other comprehensive income (loss)

(1.6)

(3.9)

(3.4)

Amounts reclassified from accumulated other comprehensive income (loss)

0.4

2.1

Amounts Reclassified from Accumulated OCI, Net of Tax and Noncontrolling Interest

6.4

4.0

Settlement cost, net of tax of $2.7, $0.7 and $2.7, respectively

0.0

6.0

2.2

8.6

Pension Plans, Defined Benefit [Member]

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

Amounts reclassified from accumulated other comprehensive income (loss)

(7.7)

(6.1)

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

^[1]

(2.5)

(5.1)

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

^[1]

(0.1)

0.0

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

^[1]

(8.7)

(2.9)

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

(11.3)

(8.0)

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

(3.6)

(1.9)

Other Postretirement Benefits Plan [Member]

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

Amounts reclassified from accumulated other comprehensive income (loss)

1.3

2.1

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

^[1]

0.1

(0.1)

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

^[1]

1.8

2.3

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

^[1]

0.0

0.4

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

1.7

2.8

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

0.4

0.7

Defined Benefit Plans Income Loss [Member] | Pension Plans, Defined Benefit [Member]

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

Other comprehensive income before reclassifications

(24.9)

(33.9)

(34.9)

1.4

(5.1)

Amounts reclassified from accumulated other comprehensive income (loss)

1.6

3.9

Defined Benefit Plans Income Loss [Member] | Other Postretirement Benefits Plan [Member]

9.0

1.0

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

Other comprehensive income before reclassifications

0.8

1.4

4.2

(0.7)

(2.4)

Amounts reclassified from accumulated other comprehensive income (loss)

0.1

(0.1)

AOCI Attributable to Parent [Member]

(0.6)

(2.8)

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

Defined Benefit Plan Prior Service Cost [Member] | Pension Plans, Defined Benefit [Member]

7.3

(4.2)

1.0

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

Other comprehensive income before reclassifications

(1.2)

(0.2)

(1.1)

0.0

Amounts reclassified from accumulated other comprehensive income (loss)

0.1

0.0

Defined Benefit Plan Prior Service Cost [Member] | Other Postretirement Benefits Plan [Member]

(1.0)

0.0

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

Other comprehensive income before reclassifications

0.5

1.9

3.6

0.0

Amounts reclassified from accumulated other comprehensive income (loss)

(1.4)

(1.7)

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

(1.4)

(1.7)

Settlement Cost [Member]

Settlement cost, net of tax of $2.7, $0.7 and $2.7, respectively

6.0

2.2

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, net of tax of $2.7, $0.7 and $2.7, respectively

6.0

2.2

Settlement Cost [Member] | Defined Benefit Plans Income Loss [Member] | Other Postretirement Benefits Plan [Member]

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

Settlement cost, net of tax of $2.7, $0.7 and $2.7, respectively

0.0

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, net of tax of $2.7, $0.7 and $2.7, respectively

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, net of tax of $2.7, $0.7 and $2.7, respectively

0.0

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

Settlement cost, net of tax of $2.7, $0.7 and $2.7, respectively

(0.3)

Curtailment | 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, net of tax of $2.7, $0.7 and $2.7, respectively

0.0

Curtailment | Defined Benefit Plans Income Loss [Member] | Other Postretirement Benefits Plan [Member]

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

Settlement cost, net of tax of $2.7, $0.7 and $2.7, respectively

(0.3)

Curtailment | 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, net of tax of $2.7, $0.7 and $2.7, respectively

0.0

Curtailment | 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, net of tax of $2.7, $0.7 and $2.7, respectively

0.0

Commodity Contract [Member]

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

Other Comprehensive Income (Loss), before Reclassifications, Net of Tax

1.3

(0.7)

Amounts reclassified from accumulated other comprehensive income (loss)

0.0

Net current period other comprehensive income (loss)

1.3

(0.7)

AOCI, Derivative Qualifying as Hedge, Excluded Component, after Tax

0.0

(1.3)

$ (0.6)

Commodity Contract [Member] | Settlement Cost [Member]

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

Settlement cost, net of tax of $2.7, $0.7 and $2.7, respectively

$ 0.0

0.0

Commodity Contract [Member] | Curtailment

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

Settlement cost, net of tax of $2.7, $0.7 and $2.7, respectively

$ 0.0

[1]	These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 13 for additional information).

Investment in Unconsolidated Affiliate Summarized Income Statement of Equity Method Investment (Details) - USD ($) $ in Millions	11 Months Ended	12 Months Ended
	Dec. 02, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Summarized Financial Information, Operating Income	$ 634.0		$ 465.0	$ 569.0
Operating revenues		$ 3,653.7	2,122.3	2,231.6
Net income (loss)		$ 737.3	(173.7)	433.6
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Operating revenues	3,466.0		2,463.0	2,960.0
Cost of Revenue	1,959.0		965.0	1,279.0
Net income (loss)	$ 461.0		$ 52.0	$ 360.0

The aggregate cost of goods produced and sold and services rendered during the reporting period.

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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).

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

Stock Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions

12 Months Ended

Sep. 30, 2020

Mar. 31, 2020

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Number of Shares Authorized

7,400,000

Tax Benefit from Compensation Expense

$ 0.6

$ 0.8

$ 1.3

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

154,523

247,252

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]

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

154,523

247,252

Minimum payout range

0.00%

Maximum payout range

200.00%

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]

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

154,523

247,252

Total Compensation Cost Not yet Recognized

$ 2.8

Treasury Stock, Shares, Acquired

405,000

Treasury Stock Acquired, Average Cost Per Share

$ 33.14

$ 38.04

Stock Issued During Period, Shares, New Issues

Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period

443,900

Performance Units Related to Earnings Per Share [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

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]

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

25,235

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

Equity Instruments Other than Options, Converted in Period

^[1]

(25,235)

Equity Instruments Other than Options, Forfeited in Period

Awards Other than Options, Fully Vested

^[2]

Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value

$ 0.8

Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value

0.0

Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value

$ 0.0

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]

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

Equity Instruments Other than Options, Forfeited in Period

Fair Value of Vested Performance Units and Restricted Stock

^[2]

$ 0.0

$ 0.8

$ 0.9

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

68,720

^[3]

67,975

68,396

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

$ 38.14

$ 38.03

$ 47.00

Expected Dividend Rate

4.70%

3.50%

4.00%

Expected Volatility Rate

29.00%

15.00%

17.00%

Risk Free Interest Rate

0.22%

1.17%

2.47%

Expected Term

2 years 10 months 6 days

2 years 10 months 9 days

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]

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

161,310

182,363

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

68,720

^[3]

67,975

68,396

Equity Instruments Other than Options, Converted in Period

^[1]

(75,693)

Equity Instruments Other than Options, Forfeited in Period

(14,132)

Awards Other than Options, Fully Vested

^[2]

48,195

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

$ 41.01

Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value

$ 1.7

Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value

0.0

Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value

$ 4.8

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]

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

106,670

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

68,720

^[3]

67,975

68,396

Equity Instruments Other than Options, Vested in Period

(48,195)

Equity Instruments Other than Options, Forfeited in Period

(14,132)

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

^[2]

113,115

106,670

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

$ 38.10

$ 42.49

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

38.14

$ 38.03

$ 47.00

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

47.00

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

$ 41.12

Fair Value of Vested Performance Units and Restricted Stock

$ 2.3

$ 2.8

$ 3.2

Total Compensation Cost Not yet Recognized

$ 2.0

Total Compensation Cost Not yet Recognized, Period for Recognition

1 year 8 months 19 days

Performance Shares [Member]

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

Restricted Stock [Member]

$ 1.8

2.6

4.5

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

$ 0.4

22,911

22,665

26,141

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

$ 30.91

$ 43.69

$ 41.63

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]

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

35,613

34,130

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

22,911

22,665

26,141

Equity Instruments Other than Options, Forfeited in Period

(8,986)

Awards Other than Options, Fully Vested

^[2]

11,241

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

$ 37.71

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value

$ (0.6)

Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value

(0.5)

Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value

$ 1.4

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]

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

34,130

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

22,911

22,665

26,141

Equity Instruments Other than Options, Vested in Period

(12,461)

Equity Instruments Other than Options, Forfeited in Period

(8,986)

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

^[2]

35,613

34,130

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

$ 35.52

$ 42.67

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

30.91

$ 43.69

$ 41.63

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

45.67

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

$ 42.51

Fair Value of Vested Performance Units and Restricted Stock

$ 0.5

$ 0.1

$ 0.0

Total Compensation Cost Not yet Recognized

$ 0.8

Total Compensation Cost Not yet Recognized, Period for Recognition

1 year 4 months 20 days

Stock Compensation Plan [Member]

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

Restricted Stock Units (RSUs)

$ 2.2

$ 3.0

4.9

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]

Equity Instruments Other than Options, Converted in Period

Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member]

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

Total Shareholder Return [Member] | Performance Shares [Member]

$ 0.0

$ 0.3

1.5

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

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

$ 1.8

$ 2.3

$ 3.0

[1]	These amounts represent performance units that vested at December 31, 2020 which were settled in February 2021.
[2]	Due to certain employees transferring between OG&E and OGE Energy.
[3]	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.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income (loss)	$ 737.3	$ (173.7)	$ 433.6
Pension Plan and Restoration of Retirement Income Plan:
Amortization of prior service cost, net of tax of $0.0, $0.0 and $0.0, respectively	0.1	0.0	0.0
Amortization of deferred net loss, net of tax of $0.9, $1.2 and $1.1, respectively	1.6	3.9	3.4
Net gain (loss) arising during the period, net of tax of $0.0, ($1.7) and ($2.5), respectively	1.4	(5.1)	(8.1)
Prior service cost arising during the period, net of tax of ($0.3), $0.0 and ($0.1), respectively	(1.1)	0.0	(0.2)
Settlement cost, net of tax of $2.7, $0.7 and $2.7, respectively	6.0	2.2	8.6
Postretirement benefit plans:
Amortization of prior service credit, net of tax of ($0.4), ($0.6) and ($0.6), respectively	(1.4)	(1.7)	(1.7)
Amortization of deferred net gain, net of tax of $0.0, $0.0 and $0.0, respectively	0.1	(0.1)	(0.2)
Net loss arising during the period, net of tax of ($0.2), ($0.8) and $(0.1), respectively	(0.7)	(2.4)	(0.2)
Curtailment cost, net of tax of $0.0, $(0.1) and $0.0, respectively	0.0	(0.3)	0.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax	(1.1)	0.0	(0.2)
Other comprehensive income (loss), net of tax	0.0	0.0	0.0
Other comprehensive gain (loss) from unconsolidated affiliates, net of tax $0.3, ($0.2) and ($0.2), respectively	1.3	(0.7)	(0.6)
Comprehensive income (loss)	744.6	(177.9)	434.6
Total comprehensive income attributable to OGE Energy	$ 360.0	$ 339.4	$ 350.2

Retirement Plans and Postretirement Benefit Plans (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

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 Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

$ 30.0

$ 10.0

Ultimate Health Care Cost Trend Rate

4.50%

Expected Future Benefit Payments, Next Twelve Months

$ 38.8

Expected Future Benefit Payments, Year Two

30.7

Expected Future Benefit Payments, Year Three

30.6

Expected Future Benefit Payments, Year Four

28.7

Expected Future Benefit Payments, Year Five

28.3

Expected Future Benefit Payments, Five Fiscal Years Thereafter

126.6

Defined Contribution Plan, Cost

12.0

14.3

$ 11.0

Postemployment Benefits Liability

1.5

1.8

Pension Plans, Defined Benefit [Member]

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

Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment

(11.9)

(12.3)

0.0

Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]

484.1

462.0

7.7

9.2

9.0

9.7

12.6

15.6

Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits

0.0

0.0

5.1

(120.4)

(33.5)

(6.0)

41.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

363.2

484.1

462.0

420.3

399.1

35.0

57.0

30.0

10.0

(120.4)

(33.5)

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

353.0

420.3

399.1

7.7

9.2

9.0

9.7

12.6

15.6

Defined Benefit Plan, Amortization of Gain (Loss)

(24.7)

(27.9)

(27.6)

(7.0)

(12.1)

(12.9)

^[1]

0.0

Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits

0.0

0.0

5.1

0.0

^[2]

3.5

2.0

1.7

32.8

22.5

26.3

Amount Attributable to Parent

^[3]

(0.2)

2.0

2.9

^[3]

6.5

5.9

4.5

Net Periodic Benefit Cost, Net of Unconsolidated Affiliates

39.3

28.4

30.8

Additional Pension Expense to Meet State Requirements

^[2]

23.0

13.8

16.1

(120.4)

(33.5)

Assumptions Used Calculating Benefit Obligation, Discount Rate

$ 2.9

$ 3.1

$ 3.0

2.75%

2.30%

3.15%

Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets

7.00%

7.50%

Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase

4.20%

Defined Benefit Plan, Benefit Obligation, Benefits Paid

$ 420.3

$ 399.1

(11.9)

(12.3)

Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member]

(341.0)

(454.7)

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

Restoration of Retirement Income Plan [Member]

0.0

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

Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment

0.0

1.4

0.0

Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]

3.0

6.1

0.0

0.1

$ 0.2

0.0

0.1

0.2

Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits

0.0

0.0

(2.9)

(4.5)

0.4

1.2

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.5

3.0

6.1

0.0

0.0

2.9

4.5

(2.9)

(4.5)

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

0.0

0.1

0.2

0.0

0.1

0.2

Defined Benefit Plan, Amortization of Gain (Loss)

0.0

(0.1)

(0.4)

(0.3)

^[1]

0.0

Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits

0.0

0.0

1.6

2.4

0.5

1.7

3.0

1.2

Amount Attributable to Parent

^[3]

0.1

^[3]

1.5

1.3

0.5

Net Periodic Benefit Cost, Net of Unconsolidated Affiliates

3.2

4.3

1.7

(2.9)

(4.5)

Defined Benefit Plan, Benefit Obligation, Benefits Paid

0.0

0.0

Other Postretirement Benefits Plan [Member]

(0.4)

(2.9)

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

Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment

(9.9)

(8.6)

0.0

Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]

109.5

104.7

0.1

0.2

2.6

3.2

4.3

Defined Benefit Plan, Plan Assets, Contributions by Plan Participant

0.0

3.1

(2.6)

(2.4)

(2.5)

4.5

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

102.4

109.5

104.7

42.7

41.9

(0.5)

1.1

5.0

5.9

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

39.9

42.7

41.9

0.1

0.2

2.6

3.2

4.3

Defined Benefit Plan, Amortization of Gain (Loss)

(1.7)

(2.7)

(2.1)

^[1]

(5.0)

(6.1)

0.0

(1.3)

0.0

^[4]

0.0

(0.1)

0.0

(1.3)

(1.0)

(1.2)

Amount Attributable to Parent

^[5]

(0.5)

(0.7)

(0.6)

^[5]

(0.5)

(0.6)

Net Periodic Benefit Cost, Net of Unconsolidated Affiliates

(1.8)

(1.5)

(1.8)

Additional Pension Expense to Meet State Requirements

^[4]

0.4

0.2

1.0

Assumptions Used Calculating Benefit Obligation, Discount Rate

$ 0.1

2.80%

2.45%

3.25%

Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets

4.00%

Health Care Cost Trend Rate Assumed for Next Fiscal Year

6.50%

Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant

$ 42.7

$ 41.9

2.6

2.4

Defined Benefit Plan, Benefit Obligation, Benefits Paid

(9.9)

(8.6)

Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]

(62.5)

(66.8)

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

14.2

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

16.2

14.2

Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]

14.2

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]

0.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

33.4

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

28.1

33.4

Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]

33.4

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

42.7

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

39.9

42.7

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

$ 42.7

Less Than 90% [Member]

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, Net Periodic Benefit Cost (Credit) [Abstract]

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, Net Periodic Benefit Cost (Credit) [Abstract]

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, Net Periodic Benefit Cost (Credit) [Abstract]

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, Net Periodic Benefit Cost (Credit) [Abstract]

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, Net Periodic Benefit Cost (Credit) [Abstract]

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, Net Periodic Benefit Cost (Credit) [Abstract]

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, Net Periodic Benefit Cost (Credit) [Abstract]

Domestic Mid-Cap Equity [Member]

40.00%

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

Domestic Small-Cap Equity [Member]

15.00%

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

International Equity [Member]

25.00%

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

Minimum [Member] | Domestic All-Cap/Large Cap Equity [Member]

20.00%

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

Minimum [Member] | Domestic Mid-Cap Equity [Member]

35.00%

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

Minimum [Member] | Domestic Small-Cap Equity [Member]

5.00%

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

Minimum [Member] | International Equity [Member]

5.00%

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

Maximum [Member] | Domestic All-Cap/Large Cap Equity [Member]

10.00%

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

Maximum [Member] | Domestic Mid-Cap Equity [Member]

60.00%

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

Maximum [Member] | Domestic Small-Cap Equity [Member]

25.00%

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

Maximum [Member] | International Equity [Member]

30.00%

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

Group Retiree Medical Insurance Contract [Member] | Other Postretirement Benefits Plan [Member]

30.00%

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

$ 33.4

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

28.1

33.4

Group Retiree Medical Insurance Contract [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]

33.4

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

Group Retiree Medical Insurance Contract [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]

0.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

33.4

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

28.1

33.4

U.S. common stocks [Member] | Pension Plans, Defined Benefit [Member]

33.4

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

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

^[6]

0.0

^[7]

252.3

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

86.1

252.3

U.S. common stocks [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]

252.3

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

252.3

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

86.1

252.3

U.S. common stocks [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]

252.3

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

U.S. treasury notes and bonds [Member] | Pension Plans, Defined Benefit [Member]

0.0

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

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

^[6],[8]

0.0

^[7],[9]

^[9]

134.3

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

135.2

^[8]

134.3

^[9]

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

^[9]

134.3

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

^[9]

134.3

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

135.2

^[8]

134.3

^[9]

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

^[9]

134.3

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

^[9]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

^[8]

0.0

^[9]

Mortgage-backed securities | Pension Plans, Defined Benefit [Member]

^[9]

0.0

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

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

^[6]

0.0

^[7]

29.3

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

24.6

29.3

Mortgage-backed securities | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]

29.3

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

Mortgage-backed securities | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]

0.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

29.3

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

24.6

29.3

Corporate fixed income and other securities [Member] | Pension Plans, Defined Benefit [Member]

29.3

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

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

^[6]

0.0

^[7]

116.6

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

107.0

116.6

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

116.6

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

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

0.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

116.6

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

107.0

116.6

Commingled fund [Member] | Pension Plans, Defined Benefit [Member]

116.6

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

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

23.6

^[6],[10]

25.4

^[7],[11]

^[11]

25.4

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

23.6

^[10]

25.4

^[11]

Commingled fund [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]

^[11]

25.4

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

^[11]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

^[10]

0.0

^[11]

Commingled fund [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]

^[11]

0.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

^[11]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

^[10]

0.0

^[11]

Foreign government bonds [Member] | Pension Plans, Defined Benefit [Member]

^[11]

0.0

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

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

^[6]

0.0

^[7]

4.6

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.9

4.6

Foreign government bonds [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]

4.6

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

Foreign government bonds [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]

0.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

4.6

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.9

4.6

Municipal bonds [Member] | Pension Plans, Defined Benefit [Member]

4.6

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

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

^[6]

0.0

^[7]

1.8

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

1.4

1.8

Municipal bonds [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]

1.8

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

Municipal bonds [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]

0.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

1.8

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

1.4

1.8

Money market funds [Member] | Pension Plans, Defined Benefit [Member]

1.8

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

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

5.5

^[6]

8.8

^[7]

8.8

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

5.5

8.8

Money market funds [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]

8.8

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

Money market funds [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]

0.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

Mutual fund [Member] | Pension Plans, Defined Benefit [Member]

0.0

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

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

^[6]

0.0

^[7]

9.2

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

99.8

9.2

Mutual fund [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]

9.2

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

9.2

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

99.8

9.2

Mutual fund [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]

9.2

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

Cash collateral [Member] | Pension Plans, Defined Benefit [Member]

0.0

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

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

^[6]

0.0

^[7]

0.7

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.6

0.7

Cash collateral [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]

0.7

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.7

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.6

0.7

Cash collateral [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]

0.7

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

Receivable (foreign currency) [Member] | Pension Plans, Defined Benefit [Member]

0.0

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

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

^[6]

0.0

^[7]

0.1

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.1

Receivable (foreign currency) [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]

0.1

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

Receivable (foreign currency) [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]

0.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.1

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.1

Preferred stocks (foreign) [Member] | Pension Plans, Defined Benefit [Member]

0.1

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

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

^[6]

0.0

^[7]

0.6

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

1.1

0.6

Preferred stocks (foreign) [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]

0.6

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.6

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

1.1

0.6

Preferred stocks (foreign) [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]

0.6

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

Total Plan investments [Member] | Pension Plans, Defined Benefit [Member]

0.0

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

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

29.1

^[6]

34.2

^[7]

583.7

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

485.9

583.7

Total Plan investments [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]

583.7

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

397.1

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

322.8

397.1

Total Plan investments [Member] | Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]

397.1

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

152.4

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

134.0

152.4

Receivable from broker for securities sold [Member] | Pension Plans, Defined Benefit [Member]

152.4

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.2

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.2

Interest and dividends receivable [Member] | Pension Plans, Defined Benefit [Member]

0.2

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

2.2

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

2.1

2.2

Payable to broker for securities purchased [Member] | Pension Plans, Defined Benefit [Member]

2.2

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

(15.8)

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

(2.0)

(15.8)

Total Plan assets [Member] | Pension Plans, Defined Benefit [Member]

(15.8)

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

420.3

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

353.0

420.3

Plan Assets Attributable to Affiliates | Pension Plans, Defined Benefit [Member]

420.3

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

(150.0)

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

(133.0)

$ (150.0)

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

$ (150.0)

[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 or liability in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.
[3]	"Amount paid by unconsolidated affiliates" is only applicable to OGE Energy. "Amount allocated from OGE Energy" is only applicable to OG&E.
[4]	Included in the pension regulatory asset or liability in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.
[5]	"Amount paid by unconsolidated affiliates" is only applicable to OGE Energy. "Amount allocated from OGE Energy" is only applicable to OG&E.
[6]	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.
[7]	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.
[8]	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.
[9]	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.
[10]	This category represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.
[11]	This category represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Parenthetical - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plan and Restoration of Retirement Income Plan:
Amortization of deferred net loss, net of tax of $1.2, $1.1 and $1.1, respectively	$ 0.9	$ 1.2	$ 1.1
Net loss arising during the period, net of tax of ($1.7), ($2.6) and ($4.7), respectively	0.0	(1.7)	(2.5)
Amortization of prior service credit, net of tax of $0.0, $0.0 and $0.0, respectively	0.0	0.0	0.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Tax	(0.3)	0.0	(0.1)
Postretirement plans:
Amortization of deferred net gain, net of tax of $0.0, $0.0 and $0.0, respectively	0.0	0.0	0.0
Net gain (loss) arising during the period, net of tax of ($0.8), ($0.1) and $0.7, respectively	(0.2)	(0.8)	(0.1)
Amortization of prior service credit, net of tax of ($0.6), ($0.6) and ($0.6), respectively	(0.4)	(0.6)	(0.6)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest	0.3	(0.2)	(0.2)
Pension Plans [Member]
Pension Plan and Restoration of Retirement Income Plan:
Settlement cost, net of tax of $0.7, $2.7 and $1.6, respectively	2.7	0.7	2.7
Other Postretirement Benefits Plan [Member]
Pension Plan and Restoration of Retirement Income Plan:
Settlement cost, net of tax of $0.7, $2.7 and $1.6, respectively	$ 0.0	$ (0.1)	$ 0.0

Stock Based Compensation

12 Months Ended

Dec. 31, 2021

Stock-Based Compensation [Abstract]

Stock-Based Compensation

In 2013, OGE Energy adopted, and its shareholders approved, the Stock Incentive Plan. Under the 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 7,400,000 shares under the Stock Incentive Plan.

The following table presents the Registrants' pre-tax compensation expense and related income tax benefit for the years ended December 31, 2021, 2020 and 2019 related to performance units and restricted stock units for the Registrants' employees.


	OGE Energy						OG&E
Year Ended December 31 (In millions)	2021		2020		2019		2021		2020		2019
Performance units:
Total shareholder return	$	7.5	$	7.9	$	8.7	$	1.8	$	2.3	$	3.0
Earnings per share	—		1.0		4.3		—		0.3		1.5
Total performance units	7.5		8.9		13.0		1.8		2.6		4.5
Restricted stock units	2.3		0.9		0.9		0.4		0.4		0.4


Total compensation expense	$	9.8	$	9.8	$	13.9	$	2.2	$	3.0	$	4.9
Income tax benefit	$	2.5	$	2.5	$	3.6	$	0.6	$	0.8	$	1.3

During the year ended December 31, 2020, OGE Energy purchased 405,000 shares of its common stock, and 154,523 and 247,252 of these shares were used during December 31, 2021 and 2020, respectively, to satisfy payouts of earned performance units and restricted stock unit grants to the Registrants' employees pursuant to OGE Energy's Stock Incentive Plan. The shares were purchased at an average cost of $38.04 and $33.14 per share on the open market during March 2020 and August 2020, respectively. OGE Energy records treasury stock purchases at cost. Treasury stock is presented as a reduction of stockholders' equity in OGE Energy's balance sheets.

During the year ended December 31, 2020, there was an immaterial number of shares of new common stock issued pursuant to OGE Energy's Stock Incentive Plan to satisfy restricted stock unit grants to employees. During the year ended December 31, 2019, OGE Energy issued 443,900 shares of new common stock to satisfy payouts of earned performance units and restricted stock unit grants to the Registrants' employees.

Performance Units

Performance Units – Total Shareholder Return

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


	OGE Energy									OG&E
	2021			2020			2019			2021			2020			2019
Number of units granted	249,909			201,552			208,647			68,720			67,975			68,396
Fair value of units granted	$	38.14		$	38.03		$	47.00		$	38.14		$	38.03		$	47.00
Expected dividend yield	4.7		%	3.5		%	4.0		%	4.7		%	3.5		%	4.0		%
Expected price volatility	29.0		%	15.0		%	17.0		%	29.0		%	15.0		%	17.0		%
Risk-free interest rate	0.22		%	1.17		%	2.47		%	0.22		%	1.17		%	2.47		%
Expected life of units (in years)	2.84			2.85			2.86			2.85			2.85			2.86

Performance Units – Earnings Per Share

In 2019, the Compensation Committee of OGE Energy's Board of Directors voted to grant restricted stock units in lieu of performance units based on earnings per share. The last outstanding grant of performance units based on earnings per share paid out during 2021. Prior to payout, OGE Energy reassessed at each reporting date whether achievement of the performance condition was probable and accrued compensation expense if and when achievement of the performance condition was probable. As a result, the compensation expense recognized for these performance units varied from period to period. There are no post-vesting restrictions related to OGE Energy's performance units based on earnings per share.

Restricted Stock Units


	OGE Energy						OG&E
	2021		2020		2019		2021		2020		2019
Restricted stock units granted	89,197		67,193		75,929		22,911		22,665		26,141
Fair value of restricted stock units granted	$	31.11	$	43.69	$	41.71	$	30.91	$	43.69	$	41.63

Performance Units and Restricted Stock Units Activity

The following tables present a summary of the activity for the Registrants' performance units and restricted stock units for the year ended December 31, 2021. 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
	Total Shareholder Return				Earnings Per Share
(Dollars in millions)	Number of Units		Aggregate Intrinsic Value		Number of Units		Aggregate Intrinsic Value		Number of Shares	Aggregate Intrinsic Value
Units/shares outstanding at 12/31/20	612,262				79,002				124,919
Granted	249,909	(A)			—				89,197

Converted	(236,990)	(B)	$	5.4	(79,002)	(B)	$	2.7	—
Vested	N/A				N/A				(53,274)	$	2.2
Forfeited	(43,929)				—				(27,171)
Units/shares outstanding at 12/31/21	581,252		$	17.5	—		$	—	133,671	$	5.1
Units/shares fully vested at 12/31/21	172,748		$	—	—		$	—	47,907	$	2.0


OG&E	Performance Units								Restricted Stock Units
	Total Shareholder Return				Earnings Per Share
(Dollars in millions)	Number of Units		Aggregate Intrinsic Value		Number of Units		Aggregate Intrinsic Value		Number of Shares		Aggregate Intrinsic Value
Units/shares outstanding at 12/31/20	182,363				25,235				34,130
Granted	68,720	(A)			—				22,911
Converted	(75,693)	(B)	$	1.7	(25,235)	(B)	$	0.8	—
Vested	N/A				N/A				(12,461)		$	0.6
Forfeited	(14,132)				—				(8,986)
Employee migration	52	(C)			—	(C)			19	(C)
Units/shares outstanding at 12/31/21	161,310		$	4.8	—		$	—	35,613		$	1.4
Units/shares fully vested at 12/31/21	48,195		$	—	—		$	—	11,241		$	0.5

(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, 2020 which were settled in February 2021.

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

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, 2021. 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
	Total Shareholder Return
	Number of Units		Weighted-Average Grant Date Fair Value			Number of Shares	Weighted-Average Grant Date Fair Value
Units/shares non-vested at 12/31/20	375,272		$	42.51		124,919	$	42.69
Granted	249,909	(A)	$	38.14		89,197	$	31.11

Vested	(172,748)		$	47.00		(53,274)	$	41.59
Forfeited	(43,929)		$	41.02		(27,171)	$	42.37
Units/shares non-vested at 12/31/21	408,504		$	38.05		133,671	$	35.64


OG&E	Performance Units -				Restricted Stock Units
	Total Shareholder Return
	Number of Units		Weighted-Average Grant Date Fair Value			Number of Shares		Weighted-Average Grant Date Fair Value
Units/shares non-vested at 12/31/20	106,670		$	42.49		34,130		$	42.67
Granted	68,720	(A)	$	38.14		22,911		$	30.91

Vested	(48,195)		$	47.00		(12,461)		$	45.67
Forfeited	(14,132)		$	41.12		(8,986)		$	42.51
Employee migration	52	(B)	$	41.01		19	(B)	$	37.71
Units/shares non-vested at 12/31/21	113,115		$	38.10		35,613		$	35.52

(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)	2021		2020		2019		2021		2020		2019
Performance units:
Total shareholder return	$	8.1	$	8.7	$	9.3	$	2.3	$	2.8	$	3.2
Earnings per share	$	—	$	2.5	$	5.2	$	—	$	0.8	$	0.9
Restricted stock units	$	2.2	$	0.1	$	0.1	$	0.5	$	0.1	$	—

Unrecognized Compensation Cost

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, 2021	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 - total shareholder return	$	7.5	1.71	$	2.0	1.72


Restricted stock units	3.5		1.48	0.8		1.39
Total unrecognized compensation cost	$	11.0		$	2.8

Report of Business Segments (Tables)

12 Months Ended

Dec. 31, 2021

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

The following tables present the results of OGE Energy's business segments for the years ended December 31, 2021, 2020 and 2019.


2021	Electric Utility		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


2020	Electric Utility		Natural Gas Midstream Operations		Other Operations		Eliminations		Total
(In millions)
Operating revenues	$	2,122.3	$	—	$	—	$	—	$	2,122.3
Fuel, purchased power and direct transmission expense	644.6		—		—		—		644.6
Other operation and maintenance	464.4		1.7		(3.3)		—		462.8
Depreciation and amortization	391.3		—		—		—		391.3
Taxes other than income	97.2		0.4		3.8		—		101.4
Operating income (loss)	524.8		(2.1)		(0.5)		—		522.2
Equity in losses of unconsolidated affiliates (A)	—		(668.0)		—		—		(668.0)
Other income (expense)	4.1		(2.9)		3.6		(1.6)		3.2
Interest expense	154.8		—		5.3		(1.6)		158.5
Income tax expense (benefit)	34.7		(158.0)		(4.1)		—		(127.4)
Net income (loss)	$	339.4	$	(515.0)	$	1.9	$	—	$	(173.7)


Investment in unconsolidated affiliates	$	—	$	374.3	$	—	$	—	$	374.3
Total assets	$	10,489.0	$	378.1	$	116.4	$	(264.7)	$	10,718.8
Capital expenditures	$	650.5	$	—	$	—	$	—	$	650.5

(A)In March 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Notes 5 and 7.


2019	Electric Utility		Natural Gas Midstream Operations		Other Operations		Eliminations		Total
(In millions)
Operating revenues	$	2,231.6	$	—	$	—	$	—	$	2,231.6
Fuel, purchased power and direct transmission expense	786.9		—		—		—		786.9
Other operation and maintenance	492.5		2.8		(3.5)		—		491.8
Depreciation and amortization	355.0		—		—		—		355.0
Taxes other than income	89.5		0.4		3.7		—		93.6
Operating income (loss)	507.7		(3.2)		(0.2)		—		504.3
Equity in earnings of unconsolidated affiliates	—		113.9		—		—		113.9
Other income (expense)	3.1		(8.6)		2.2		(3.6)		(6.9)
Interest expense	140.5		—		11.0		(3.6)		147.9
Income tax expense (benefit)	20.1		20.7		(11.0)		—		29.8
Net income	$	350.2	$	81.4	$	2.0	$	—	$	433.6


Investment in unconsolidated affiliates	$	—	$	1,132.9	$	—	$	—	$	1,132.9
Total assets	$	10,076.6	$	1,135.4	$	107.0	$	(294.7)	$	11,024.3
Capital expenditures	$	635.5	$	—	$	—	$	—	$	635.5

Common Equity

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Common Equity

OGE Energy

Automatic Dividend Reinvestment and Stock Purchase Plan

OGE Energy issued no shares of common stock under its Automatic Dividend Reinvestment and Stock Purchase Plan in 2021. OGE Energy may, from time to time, issue shares under its Automatic Dividend Reinvestment and Stock Purchase Plan or purchase shares traded on the open market. At December 31, 2021, there were 4,774,442 shares of unissued common stock reserved for issuance under OGE Energy's Automatic Dividend Reinvestment and Stock Purchase Plan.

Earnings (Loss) Per Share


(In millions except per share data)	2021		2020		2019
Net income (loss)	$	737.3	$	(173.7)	$	433.6
Average common shares outstanding:
Basic average common shares outstanding	200.1		200.1		200.1
Effect of dilutive securities:
Contingently issuable shares (performance and restricted stock units)	0.2		—		0.6
Diluted average common shares outstanding	200.3		200.1		200.7
Basic earnings (loss) per average common share	$	3.68	$	(0.87)	$	2.17
Diluted earnings (loss) per average common share	$	3.68	$	(0.87)	$	2.16
Anti-dilutive shares excluded from earnings per share calculation	—		0.3		—

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. Prior to December 2021, OGE Energy utilized receipts from its equity method investment in Enable to pay dividends to its shareholders. In light of the completed Energy Transfer merger, OGE Energy expects to utilize, in part, cash distributions from Energy Transfer 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 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 $1.6 billion of OGE Energy's retained earnings from being paid out in dividends. Accordingly, approximately $1.4 billion of OGE Energy's retained earnings as of December 31, 2021 are unrestricted for the payment of dividends.

OG&E

There were no new shares of OG&E common stock issued in 2021, 2020 or 2019.

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 also 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 $580.9 million of OG&E's retained earnings from being paid out in dividends. Accordingly, approximately $2.5 billion of OG&E's retained earnings as of December 31, 2021 are unrestricted for the payment of dividends.

Investment in Unconsolidated Affiliate (Tables)

12 Months Ended

Dec. 31, 2021

Equity Method Investments and Joint Ventures [Abstract]

Summarized Balance Sheet Financial Information, Equity Method Investment [Table Text Block]

The following tables present summarized unaudited financial information for 100 percent of Enable as of December 2, 2021 and December 31, 2020 and for the period of January 1, 2021 through December 2, 2021 and the years ended December 31, 2020 and 2019.



Balance Sheet	December 2, 2021		December 31, 2020
(In millions)
Current assets	$	594	$	381
Non-current assets	$	11,227	$	11,348
Current liabilities	$	1,254	$	582
Non-current liabilities	$	3,281	$	4,052

Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block]


	Period of January 1, 2021 through December 2, 2021		Year Ended
Income Statement	Period of January 1, 2021 through December 2, 2021		December 31, 2020		December 31, 2019
(In millions)
Total revenues	$	3,466	$	2,463	$	2,960
Cost of natural gas and NGLs (excluding depreciation and amortization)	$	1,959	$	965	$	1,279
Operating income	$	634	$	465	$	569
Net income	$	461	$	52	$	360

Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Table Text Block]

The following table presents a reconciliation of OGE Energy's equity in earnings (losses) of unconsolidated affiliates for the period of January 1, 2021 through December 2, 2021 and the years ended December 31, 2020 and 2019. For further discussion of Enable's net income, see "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations - Results of Operations - OGE Holdings (Natural Gas Midstream Operations)."


	Period of January 1, 2021 through December 2, 2021			Year Ended
(In millions)				December 31, 2020			December 31, 2019
Enable net income	$	461.0		$	52.0		$	360.0

Differences due to timing of OGE Energy and Enable accounting close	9.0			—			—
Enable net income used to calculate OGE Energy's equity in earnings	$	470.0		$	52.0		$	360.0
OGE Energy's percent ownership at period end	25.5		%	25.5		%	25.5		%
OGE Energy's portion of Enable net income	$	119.8		$	13.2		$	91.8
Amortization of basis difference and dilution recognition (A)	50.0			98.8			22.1
Impairment of OGE Energy's equity method investment in Enable (B)	—			(780.0)			—
Equity in earnings (losses) of unconsolidated affiliates (C)	$	169.8		$	(668.0)		$	113.9

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

(B)Effective March 31, 2020, OGE Energy estimated the fair value of its investment in Enable was below the book value and concluded the decline in value was not temporary due to the severity of the decline and recent rapid deterioration, as well as the near term future outlook, of the midstream oil and gas industry. Accordingly, OGE Energy recorded a $780.0 million impairment on its investment in Enable in 2020. Further information concerning the fair value method used to measure the impairment on OGE Energy's investment in Enable can be found in Note 7.

(C)For the year ended December 31, 2020, Enable recorded a $225.0 million impairment on its SESH equity method investment. Enable estimated the fair value of this equity method investment was below the carrying value at September 30, 2020 and concluded the decline in value was other than temporary due to the expiration of a transportation contract and the current status of renewal negotiations. The impairment ran through OGE Energy's portion of Enable net income and was offset by basis differences that flow through the amortization of basis difference and dilution recognition line item above.


	Period of January 1, 2021 through December 2, 2021		Year Ended
(In millions)			December 31, 2020		December 31, 2019
Operating revenues:
Electricity to power electric compression assets	$	13.3	$	15.1	$	15.9
Fuel, purchased power and direct transmission expense:
Natural gas transportation services	$	32.7	$	32.8	$	41.2

Natural gas purchases (sales)	$	(33.5)	$	2.7	$	(6.0)

Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2021

Long-term Debt, Unclassified [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

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)
0.11%	-	0.27%	Garfield Industrial Authority, January 1, 2025	$	47.0
0.11%	-	0.33%	Muskogee Industrial Authority, January 1, 2025	32.4
0.11%	-	0.27%	Muskogee Industrial Authority, June 1, 2027	56.0
Total (redeemable during next 12 months)				$	135.4

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.

Line of Credit Facility [Line Items]

Short-Term Debt and Credit Facilities (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Line of Credit Facility, Current Borrowing Capacity

^[1],[2]

$ 550.0

Short-term debt

486.9

$ 95.0

Line of Credit Facility [Abstract]

Aggregate Commitment

1,100.0

Letters of Credit Outstanding, Amount

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

0.4

Amount Outstanding

^[3]

$ 487.3

Weighted Average Interest Rate

0.36%

Maturity

^[1],[2]

Dec. 17, 2026

Intercompany Borrowing Agreement - Maximum Borrowing Capacity

$ 350.0

Period For Which Regulatory Approval Has Been Given to Acquire Short Term Debt

2 years

Short Term Borrowing Capacity That Has Regulatory Approval

$ 800.0

Ratio of Consolidated Debt to Consolidated Capitalization

65.00%

Acceleration of Indebtedness of Credit Facility

$ 100.0

Nonpayment of Uninsured Judgments

100.0

Outstanding Intercompany Borrowings

60.0

Proceeds from Contributed Capital

530.0

Proceeds from (Repayments of) Related Party Debt

470.0

Advances from parent

101.3

0.0

Advances to parent

0.0

$ 272.0

Debt Instrument, Face Amount

$ 1,000.0

[1]	OG&E has an intercompany borrowing agreement with OGE Energy whereby OG&E has access to up to $350.0 million of OGE Energy's revolving credit amount. This agreement has a termination date of December 17, 2026. At December 31, 2021, there were $60.0 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]	Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at December 31, 2021.

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

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

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

Valuation Allowances and Reserves, Beginning Balance

$ 2.6

$ 1.5

$ 1.7

Valuation Allowances and Reserves, Charged to Cost and Expense

3.2

3.0

2.2

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

^[1]

3.4

1.9

2.4

Valuation Allowances and Reserves, Ending Balance

$ 2.4

$ 2.6

$ 1.5

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

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]

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


(In millions)	2022		2023		2024		2025		2026		Total
Purchase obligations and commitments:
Minimum purchase commitments	$	97.7	$	50.4	$	31.2	$	24.6	$	24.6	$	228.5
Expected wind purchase commitments	55.6		56.0		56.6		56.9		57.4		282.5
Long-term service agreement commitments	2.7		2.6		15.0		24.4		9.7		54.4


Total purchase obligations and commitments	$	156.0	$	109.0	$	102.8	$	105.9	$	91.7	$	565.4

Schedule of Wind Power Purchases [Table Text Block]

The following table presents OG&E's wind power purchase 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, 2021, 2020 and 2019.


Year Ended December 31 (In millions)	2021		2020		2019
CPV Keenan	$	27.3	$	27.5	$	27.2
Edison Mission Energy	21.7		22.8		23.1
NextEra Energy	6.8		7.0		7.4

Total wind power purchased	$	55.8	$	57.3	$	57.7

Retirement Plans and Postretirement Benefit Plans Postretirement Benefit Plans (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]

$ 30.0

$ 10.0

Level 3 Asset Value, Beginning of Period

33.4

0.7

0.2

(1.1)

(0.1)

Administrative expenses and charges

(0.1)

Claims paid

(4.9)

Level 3 Asset Value, End of Period

28.1

33.4

Postretirement Plan, Expected Future Benefit Payments, Next Twelve Months

9.6

Postretirement Plan, Expected Future Benefit Payments, Year Two

9.3

Postretirement Plan, Expected Future Benefit Payments, Year Three

8.0

Postretirement Plan, Expected Future Benefit Payments in Year Four

7.6

Postretirement Plan, Expected Future Benefit Payments, Year Five

7.2

Postretirement Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter

30.2

Postemployment Benefits Liability

$ 1.5

$ 1.8

Ultimate Health Care Cost Trend Rate

4.50%

Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate

3.50%

4.00%

Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate

3.50%

4.00%

Defined Contribution Plan, Cost

$ 12.0

$ 14.3

$ 11.0

Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay

5.00%

Defined Contribution Plan, Employer Matching Contribution, Percent of Match

200.00%

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value

$ 28.1

33.4

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Claims Paid

4.9

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Administrative Expenses and Charges

0.1

Unrealized gains

(1.1)

Interest income

0.7

Dividend income

0.2

Pension Plan [Member]

Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]

484.1

462.0

7.7

9.2

9.0

9.7

12.6

15.6

(120.4)

(33.5)

(6.0)

41.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

363.2

484.1

462.0

420.3

399.1

35.0

57.0

30.0

10.0

(120.4)

(33.5)

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

353.0

420.3

399.1

Funded Status of Plan

(10.2)

(63.8)

7.7

9.2

9.0

9.7

12.6

15.6

(24.7)

(27.9)

(27.6)

^[1]

0.0

0.0

^[2]

3.5

2.0

1.7

32.8

22.5

26.3

Net Periodic Benefit Cost, Net of Unconsolidated Affiliates

^[3]

(0.2)

2.0

2.9

39.3

28.4

30.8

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]

Assumptions Used Calculating Benefit Obligation, Discount Rate

$ 2.9

$ 3.1

$ 3.0

2.75%

2.30%

3.15%

Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate

2.63%

2.88%

3.63%

Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets

7.00%

7.50%

Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase

4.20%

Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase

4.20%

Defined Benefit Plan, Benefit Obligation, Benefits Paid

$ (11.9)

$ (12.3)

11.9

12.3

Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment

341.0

454.7

0.0

Pension Plan [Member] | Equity Funds [Member]

0.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

^[4]

25.4

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]

23.6

^[5]

25.4

^[4]

Pension Plan [Member] | Money market funds [Member]

23.6

^[5],[6]

25.4

^[4],[7]

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

8.8

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]

5.5

8.8

Pension Plan [Member] | Total Plan assets [Member]

5.5

^[6]

8.8

^[7]

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

420.3

Pension Plan [Member] | Plan Assets Attributable to Affiliates

353.0

420.3

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

(150.0)

Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Funds [Member]

(133.0)

(150.0)

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

^[4]

0.0

Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Money market funds [Member]

0.0

^[5]

0.0

^[4]

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Funds [Member]

0.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

^[4]

0.0

Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Money market funds [Member]

0.0

^[5]

0.0

^[4]

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]

0.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Other Postretirement Benefit Plans, Defined Benefit [Member]

0.0

Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]

109.5

104.7

0.1

0.2

$ 0.2

2.6

3.2

4.3

(2.5)

4.5

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

102.4

109.5

104.7

42.7

41.9

(0.5)

1.1

5.0

5.9

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

39.9

42.7

41.9

0.1

0.2

2.6

3.2

4.3

(1.7)

^[1]

(5.0)

(6.1)

0.0

(1.3)

0.0

^[8]

0.0

(0.1)

0.0

(1.3)

(1.0)

(1.2)

Net Periodic Benefit Cost, Net of Unconsolidated Affiliates

^[9]

(0.5)

(0.7)

(0.6)

(1.8)

(1.5)

(1.8)

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]

Assumptions Used Calculating Benefit Obligation, Discount Rate

$ 0.1

2.80%

2.45%

3.25%

Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate

2.45%

3.25%

4.30%

Health Care Cost Trend Rate Assumed for Next Fiscal Year

6.50%

Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets

4.00%

Defined Benefit Plan, Benefit Obligation, Benefits Paid

$ (9.9)

$ (8.6)

9.9

8.6

Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment

62.5

66.8

0.0

Other Postretirement Benefit Plans, Defined Benefit [Member] | Group Retiree Medical Insurance Contract [Member]

0.0

3.1

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

33.4

Other Postretirement Benefit Plans, Defined Benefit [Member] | U.S. Equity Mutual Funds Investment [Member]

28.1

33.4

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

14.2

Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]

16.2

14.2

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

14.2

Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Group Retiree Medical Insurance Contract [Member]

16.2

14.2

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Equity Mutual Funds Investment [Member]

0.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

14.2

Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]

16.2

14.2

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member]

0.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

33.4

Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Group Retiree Medical Insurance Contract [Member]

28.1

33.4

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

33.4

Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. Equity Mutual Funds Investment [Member]

28.1

33.4

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.0

Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]

0.0

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

42.7

Other Pension Plan [Member]

39.9

42.7

Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]

3.0

6.1

0.0

0.1

$ 0.2

0.0

0.1

0.2

(2.9)

(4.5)

0.4

1.2

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

0.5

3.0

6.1

0.0

0.0

2.9

4.5

(2.9)

(4.5)

Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]

0.0

Funded Status of Plan

(0.5)

(3.0)

0.0

0.1

0.2

0.0

0.1

0.2

0.0

^[1]

0.0

0.0

1.6

2.4

0.5

1.7

3.0

1.2

Net Periodic Benefit Cost, Net of Unconsolidated Affiliates

^[3]

0.1

3.2

4.3

$ 1.7

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]

Defined Benefit Plan, Benefit Obligation, Benefits Paid

0.0

0.0

Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment

0.4

2.9

1.4

0.0

Long-term Debt, Unclassified [Abstract]

$ 0.0

[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 or liability in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.
[3]	"Amount paid by unconsolidated affiliates" is only applicable to OGE Energy. "Amount allocated from OGE Energy" is only applicable to OG&E.
[4]	This category represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.
[5]	This category represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.
[6]	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.
[7]	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.
[8]	Included in the pension regulatory asset or liability in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.
[9]	"Amount paid by unconsolidated affiliates" is only applicable to OGE Energy. "Amount allocated from OGE Energy" is only applicable to OG&E.

Summary of Significant Accounting Policies Fuel Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Fuel inventories	$ 40.6	$ 36.5
Other	67.7	36.9
Public Utilities, Inventory, Fuel [Member]
Fuel inventories	$ 40.6	$ 36.5

Long-Term Debt

12 Months Ended

Dec. 31, 2021

Long-Term Debt

A summary of the Registrants' long-term debt is included in the statements of capitalization. At December 31, 2021, the Registrants were in compliance with all of their debt agreements.

Maturities of OGE Energy's long-term debt during the next five years consist of $1.0 billion in 2023 and $79.4 million in 2025. Maturities of OG&E's long-term debt during the next five years consist of $500.0 million in 2023 and $79.4 million in 2025. All other long-term debt of the Registrants matures after 2026.

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.

OG&E Industrial Authority Bonds


Series			Date Due	Amount
				(In millions)
0.11%	-	0.27%	Garfield Industrial Authority, January 1, 2025	$	47.0
0.11%	-	0.33%	Muskogee Industrial Authority, January 1, 2025	32.4
0.11%	-	0.27%	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.

Issuance of Long-Term Debt

In May 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. Each series of notes is due May 26, 2023 but may be redeemed by OGE Energy or OG&E after November 26, 2021 at a price equal to 100 percent of the principal amount of the senior notes being redeemed, plus any accrued and unpaid interest. The proceeds from these issuances were used to repay $900.0 million of the $1.0 billion term loan OGE Energy entered into in March 2021 to help cover the fuel and purchased power costs incurred by OG&E during Winter Storm Uri.

Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,588.7	$ 2,069.8	$ 2,175.5
Provision for Rate Refund [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	3.8	(0.9)
Integrated Market [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	468.9	49.6	38.4
Transmission [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	140.2	143.3	148.0
Other Contracts with Customers [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1.1	30.7	29.1
Residential [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	1,309.1	842.7	865.8
Commercial [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	749.2	465.6	486.6
Industrial [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	323.0	192.6	217.8
Oilfield [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	312.8	169.2	200.4
Public Authority [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	284.4	172.3	190.3
Total Retail Customer [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,978.5	$ 1,842.4	$ 1,960.9

Short-Term Debt and Credit Facilities

12 Months Ended

Dec. 31, 2021

Short-term Debt [Abstract]

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. As of December 31, 2021, OGE Energy had $486.9 million short-term debt as compared to $95.0 million short-term debt at December 31, 2020. At December 31, 2021, OG&E had $101.3 million in advances from OGE Energy compared to $272.0 million in advances to OGE Energy at December 31, 2020.

In March 2021, OGE Energy entered into a $1.0 billion unsecured 364-day term loan agreement and borrowed the full $1.0 billion to help cover the increased fuel and purchased power costs incurred by OG&E during Winter Storm Uri. The term loan contained substantially the same covenants as OGE Energy's revolving credit agreement in place at that time, including various financial ratio covenants. Contemporaneously with the closing of the term loan agreement, in March 2021, OGE Energy made a capital contribution of $530.0 million to OG&E using the term loan proceeds, and OGE Energy also loaned $470.0 million to OG&E pursuant to an intercompany note issued by OG&E to OGE Energy. In May 2021, OG&E repaid the $470.0 million to OGE Energy, and OGE Energy used this repayment and other funds from its issuance of senior notes in May

2021 to repay $900.0 million of the $1.0 billion term loan, as further discussed in Note 11. In December 2021, OGE Energy repaid the remaining $100.0 million outstanding that was borrowed under the term loan agreement.

On December 17, 2021, OGE Energy and OG&E each entered into new $550.0 million unsecured five-year revolving credit facilities to replace existing facilities. Each of these new facilities is scheduled to terminate on December 17, 2026. However, each of OGE Energy and OG&E have the right to request an extension of the revolving credit facility termination date under their respective facility for an additional one-year period, which extension option can be exercised up to two times. All such extension requests are subject to majority lender group approval (and only the commitments of those lenders that consent to such extension (or that agree to replace any non-consenting lender) will be extended for such additional period).

Borrowings under OGE Energy's new facility bear interest at rates equal to either the eurodollar base rate (reserve adjusted, if applicable), plus a margin of 0.80 percent to 1.475 percent, or an alternate base rate, plus a margin of 0.0 percent to 0.475 percent. OGE Energy's new facility has a facility fee that ranges from 0.075 percent to 0.275 percent. Interest rate margins and facility fees are based on OGE Energy's then-current senior unsecured credit ratings. Borrowings under OG&E's new facility shall bear interest at rates equal to either the eurodollar base rate (reserve adjusted, if applicable), plus a margin of 0.69 percent to 1.275 percent, or an alternate base rate, plus a margin of 0.0 percent to 0.275 percent. OG&E's new facility has a facility fee that ranges from 0.06 percent to 0.225 percent. Both OGE Energy's and OG&E's new facilities include customary LIBOR replacement language. Interest rate margins and facility fees for both OGE Energy and OG&E are based on each of their then-current senior unsecured credit ratings.

Each of the facilities contains a mechanism which, subject to approval by the respective borrower, the sustainability structuring agent, and the required lenders, permits a reduction in the applicable margin and/or facility fees if the respective borrower meets certain environmental, social and governance targets.

Each of the facilities provides for issuance of letters of credit, provided that (i) the aggregate outstanding credit exposure shall not exceed the amount of the revolving credit facilities and (ii) the aggregate outstanding stated amount of letters of credit issued under such facility shall not exceed a specified maximum sublimit ($100.0 million for each of OGE Energy and OG&E). Advances under the facilities may be used to refinance existing indebtedness and for working capital and general corporate purposes of the respective borrower and its subsidiaries, including commercial paper liquidity support, letters of credit, acquisitions and distributions.

Each of the facilities is unsecured and, under certain circumstances, may be increased (by up to $150.0 million in each case for OGE Energy and OG&E), to a maximum revolving commitment limit of $700.0 million for each of OGE Energy and OG&E. Advances of revolving loans and letters of credit under the facilities are subject to certain conditions precedent, including the accuracy of certain representations and warranties and the absence of any default or unmatured default.

The following table presents information regarding the Registrants' revolving credit agreements at December 31, 2021.


	Aggregate		Amount		Weighted-Average
Entity	Commitment		Outstanding (A)		Interest Rate			Expiration
	(In millions)
OGE Energy (B)	$	550.0	$	486.9	0.36	%	(E)	December 17, 2026
OG&E (C)(D)	550.0		0.4		1.15	%	(E)	December 17, 2026
Total	$	1,100.0	$	487.3	0.36	%

(A)Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at December 31, 2021.

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

The Registrants' credit facilities each have a financial covenant requiring that the respective borrower maintain a maximum debt to capitalization ratio of 65 percent, as defined in each 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 $800.0 million in short-term borrowings at any one time for a two-year period beginning January 1, 2021 and ending December 31, 2022.

Summary of Significant Accounting Policies Regulated Operations (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2021

Dec. 02, 2021

Dec. 31, 2020

Schedule of Regulatory Assets and Liabilities [Line Items]

Fuel clause under recoveries

$ 151.9

$ 0.0

Fuel clause over recoveries

0.0

28.6

182.6

19.8

Regulatory Liability, Current

1,230.8

415.6

2.5

35.1

Prior Period Reclassification Adjustment

1,231.1

1,188.9

$ 23.1

Investment Owned, Balance, Shares

95,389,721

110,982,805

Income taxes recoverable from customers, net [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

Accrued removal obligations [Member]

$ 930.7

867.4

Schedule of Regulatory Assets and Liabilities [Line Items]

Other Regulatory Liabilities [Member]

296.8

316.8

Schedule of Regulatory Assets and Liabilities [Line Items]

Regulatory Liability, Current

^[1]

2.5

6.5

Oklahoma demand program rider under recovery [Member]

3.6

4.7

Schedule of Regulatory Assets and Liabilities [Line Items]

SPP cost tracker under recovery [Member]

^[2]

11.7

0.0

Schedule of Regulatory Assets and Liabilities [Line Items]

Benefit obligations regulatory asset [Member]

^[2]

9.3

7.0

Schedule of Regulatory Assets and Liabilities [Line Items]

Deferred storm expenses [Member]

109.2

164.9

Schedule of Regulatory Assets and Liabilities [Line Items]

Schedule of Regulatory Assets and Liabilities [Line Items]

172.8

158.8

Smart Grid [Member]

Unamortized loss on reacquired debt [Member]

3.9

11.2

Schedule of Regulatory Assets and Liabilities [Line Items]

Deferred Pension Expenses [Member]

8.9

9.7

Schedule of Regulatory Assets and Liabilities [Line Items]

Dry Scrubber Regulatory Asset [Member]

12.1

9.3

Schedule of Regulatory Assets and Liabilities [Line Items]

Other Regulatory Assets [Member]

18.9

19.7

Schedule of Regulatory Assets and Liabilities [Line Items]

^[2]

8.7

8.4

Schedule of Regulatory Assets and Liabilities [Line Items]

10.4

11.1

Pension tracker [Member]

Schedule of Regulatory Assets and Liabilities [Line Items]

42.9

18.1

Frontier Plant

Schedule of Regulatory Assets and Liabilities [Line Items]

6.7

6.4

COVID-19 Impact

Generation Capacity Replacement rider

8.2

6.4

Schedule of Regulatory Assets and Liabilities [Line Items]

Schedule of Regulatory Assets and Liabilities [Line Items]

^[2]

1.0

4.4

Winter Storm Uri Costs

Schedule of Equity Method Investments [Line Items]

$ 88.9

$ 0.0

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

Investment in Unconsolidated Affiliate

12 Months Ended

Dec. 31, 2021

Equity Method Investments and Joint Ventures Disclosure [Text Block]

Investment in Unconsolidated Affiliates

On December 2, 2021, Energy Transfer completed its acquisition of Enable, and all of the 110,982,805 common units of Enable owned by OGE Energy were exchanged for 95,389,721 common units of Energy Transfer. As part of the transaction, Energy Transfer also acquired the general partner interests of Enable from OGE Energy and CenterPoint for cash consideration. Further discussion of the transaction can be found in Note 1. The below discussion relates to OGE Energy's equity method investment in Enable prior to December 2, 2021.

In 2013, OGE Energy, CenterPoint and another party formed Enable as a private limited partnership, and OGE Energy and the other party indirectly contributed 100 percent of the equity interests in Enogex LLC to Enable. OGE Energy determined that its contribution of Enogex LLC to Enable met the requirements of being in substance real estate and recorded the contribution at historical cost. The formation of Enable was considered a business combination, and CenterPoint was the acquirer of Enogex Holdings for accounting purposes. Under this method, the fair value of the consideration paid by

CenterPoint for Enogex Holdings was allocated to the assets acquired and liabilities assumed based on their fair value. Enogex Holdings' assets, liabilities and equity were accordingly adjusted to estimated fair value, resulting in an increase to Enable's equity of $2.2 billion. Since the contribution of Enogex LLC to Enable was recorded at historical cost, the effects of the amortization and depreciation expense associated with the fair value adjustments on Enable's results of operations were eliminated in OGE Energy's recording of its equity in earnings of Enable through the closing date of December 2, 2021. As prior real estate sales accounting guidance was superseded by ASU 2017-05, "Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets," prior to December 2, 2021, OGE Energy recognized gains or losses on sales or dilution events in its investment in Enable within OGE Energy's earnings, net of proportional basis difference recognition.

OGE Energy recorded equity in earnings of unconsolidated affiliates of $169.8 million for the period of January 1, 2021 through December 2, 2021 compared to equity in losses of unconsolidated affiliates of $668.0 million for the year ended December 31, 2020 and equity in earnings of unconsolidated affiliates of $113.9 million for the year ended December 31, 2019. Equity in earnings (losses) of unconsolidated affiliates includes OGE Energy's share of Enable's earnings adjusted for the amortization of the basis difference of OGE Energy's original investment in Enogex LLC and its previous underlying equity in the net assets of Enable, as well as any impairment OGE Energy recorded on its investment in Enable. Equity in earnings (losses) of unconsolidated affiliates was also adjusted for the elimination of the Enogex Holdings fair value adjustments, as described above. These amortizations may also include gain or loss on dilution, net of proportional basis difference recognition.



Balance Sheet	December 2, 2021		December 31, 2020
(In millions)
Current assets	$	594	$	381
Non-current assets	$	11,227	$	11,348
Current liabilities	$	1,254	$	582
Non-current liabilities	$	3,281	$	4,052


	Period of January 1, 2021 through December 2, 2021		Year Ended
Income Statement	Period of January 1, 2021 through December 2, 2021		December 31, 2020		December 31, 2019
(In millions)
Total revenues	$	3,466	$	2,463	$	2,960
Cost of natural gas and NGLs (excluding depreciation and amortization)	$	1,959	$	965	$	1,279
Operating income	$	634	$	465	$	569
Net income	$	461	$	52	$	360


	Period of January 1, 2021 through December 2, 2021			Year Ended
(In millions)				December 31, 2020			December 31, 2019
Enable net income	$	461.0		$	52.0		$	360.0

Differences due to timing of OGE Energy and Enable accounting close	9.0			—			—
Enable net income used to calculate OGE Energy's equity in earnings	$	470.0		$	52.0		$	360.0
OGE Energy's percent ownership at period end	25.5		%	25.5		%	25.5		%
OGE Energy's portion of Enable net income	$	119.8		$	13.2		$	91.8
Amortization of basis difference and dilution recognition (A)	50.0			98.8			22.1
Impairment of OGE Energy's equity method investment in Enable (B)	—			(780.0)			—
Equity in earnings (losses) of unconsolidated affiliates (C)	$	169.8		$	(668.0)		$	113.9

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

Distributions received from Enable were $73.4 million, $91.7 million and $144.0 million during the years ended December 31, 2021, 2020 and 2019, respectively.

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.

Retirement Plans and Postretirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2021

Retirement Plans and Postretirement Benefit Plans [Abstract]

Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]


	OGE Energy								OG&E
	Pension Plan				Restoration of Retirement Income Plan				Pension Plan				Restoration of Retirement Income Plan
December 31 (In millions)	2021		2020		2021		2020		2021		2020		2021		2020
Change in benefit obligation
Beginning obligations	$	654.6	$	616.1	$	7.8	$	10.3	$	484.1	$	462.0	$	3.0	$	6.1
Service cost	11.2		13.2		0.8		0.8		7.7		9.2		—		0.1
Interest cost	13.3		17.0		0.1		0.2		9.7		12.6		—		0.1
Plan settlements	(158.6)		(42.8)		(4.6)		(5.3)		(120.4)		(33.5)		(2.9)		(4.5)
Plan amendments	—		—		1.4		—		—		—		—		—
Plan curtailments	—		—		(0.1)		0.2		—		—		—		—
Special termination benefits	—		7.6		—		—		—		5.1		—		—

Actuarial (gains) losses	(3.5)		57.7		0.5		1.6		(6.0)		41.0		0.4		1.2
Benefits paid	(14.1)		(14.2)		—		—		(11.9)		(12.3)		—		—
Ending obligations	$	502.9	$	654.6	$	5.9	$	7.8	$	363.2	$	484.1	$	0.5	$	3.0

Change in plans' assets
Beginning fair value	$	570.3	$	530.3	$	—	$	—	$	420.3	$	399.1	$	—	$	—
Actual return on plans' assets	48.4		77.0		—		—		35.0		57.0		—		—
Employer contributions	40.0		20.0		4.6		5.3		30.0		10.0		2.9		4.5
Plan settlements	(158.6)		(42.8)		(4.6)		(5.3)		(120.4)		(33.5)		(2.9)		(4.5)

Benefits paid	(14.1)		(14.2)		—		—		(11.9)		(12.3)		—		—
Ending fair value	$	486.0	$	570.3	$	—	$	—	$	353.0	$	420.3	$	—	$	—
Funded status at end of year	$	(16.9)	$	(84.3)	$	(5.9)	$	(7.8)	$	(10.2)	$	(63.8)	$	(0.5)	$	(3.0)
Accumulated postretirement benefit obligation	$	475.2	$	610.8	$	5.4	$	6.9	$	341.0	$	454.7	$	0.4	$	2.9


	OGE Energy				OG&E
	Postretirement Benefit Plans				Postretirement Benefit Plans
December 31 (In millions)	2021		2020		2021		2020
Change in benefit obligation
Beginning obligations	$	144.5	$	136.5	$	109.5	$	104.7
Service cost	0.2		0.2		0.1		0.2
Interest cost	3.4		4.2		2.6		3.2

Plan curtailments	1.9		4.0		—		3.1
Participants' contributions	3.5		3.3		2.6		2.4
Actuarial (gains) losses	(3.7)		7.3		(2.5)		4.5
Benefits paid	(12.5)		(11.0)		(9.9)		(8.6)
Ending obligations	$	137.3	$	144.5	$	102.4	$	109.5

Change in plans' assets
Beginning fair value	$	47.6	$	47.0	$	42.7	$	41.9
Actual return on plans' assets	(0.5)		1.2		(0.5)		1.1
Employer contributions	6.2		7.1		5.0		5.9

Participants' contributions	3.5		3.3		2.6		2.4
Benefits paid	(12.5)		(11.0)		(9.9)		(8.6)
Ending fair value	$	44.3	$	47.6	$	39.9	$	42.7
Funded status at end of year	$	(93.0)	$	(96.9)	$	(62.5)	$	(66.8)

Schedule of Defined Benefit Plans Disclosures [Table Text Block]


	OGE Energy												OG&E
	Pension Plan						Restoration of Retirement Income Plan						Pension Plan						Restoration of Retirement Income Plan
Year Ended December 31 (In millions)	2021		2020		2019		2021		2020		2019		2021		2020		2019		2021		2020		2019
Service cost	$	11.2	$	13.2	$	12.9	$	0.8	$	0.8	$	0.5	$	7.7	$	9.2	$	9.0	$	—	$	0.1	$	0.2
Interest cost	13.3		17.0		20.7		0.1		0.2		0.4		9.7		12.6		15.6		—		0.1		0.2
Expected return on plan assets	(34.1)		(37.6)		(36.1)		—		—		—		(24.7)		(27.9)		(27.6)		—		—		—

Amortization of net loss	9.4		17.1		17.3		0.2		0.5		0.5		7.0		12.1		12.9		0.1		0.4		0.3
Plan curtailments	—		—		—		—		0.2		—		—		—		—		—		—		—
Special termination benefits	—		7.6		—		—		—		—		—		5.1		—		—		—		—
Amortization of unrecognized prior service cost (A)	—		—		—		0.1		—		—		—		—		—		—		—		—
Settlement cost	41.3		14.1		27.6		2.1		2.7		0.5		33.1		11.4		16.4		1.6		2.4		0.5
Total net periodic benefit cost	41.1		31.4		42.4		3.3		4.4		1.9		32.8		22.5		26.3		1.7		3.0		1.2
Less: Amount paid by unconsolidated affiliates (B)	(0.2)		2.0		2.9		0.1		0.1		0.1
Plus: Amount allocated from OGE Energy (B)													6.5		5.9		4.5		1.5		1.3		0.5
Net periodic benefit cost	$	41.3	$	29.4	$	39.5	$	3.2	$	4.3	$	1.8	$	39.3	$	28.4	$	30.8	$	3.2	$	4.3	$	1.7

(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)	2021		2020		2019
Increase of regulatory asset related to pension expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A)	$	23.0	$	13.8	$	16.1
Deferral of pension expense related to pension settlement, curtailment and special termination benefits charges included in the above line item:
Oklahoma jurisdiction (A)	$	37.9	$	21.6	$	17.9
Arkansas jurisdiction (A)	$	3.5	$	2.0	$	1.7

(A)Included in the pension regulatory asset or liability 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)	2021		2020		2019		2021		2020		2019
Service cost	$	0.2	$	0.2	$	0.2	$	0.1	$	0.2	$	0.2
Interest cost	3.4		4.2		5.6		2.6		3.2		4.3
Expected return on plan assets	(1.8)		(1.8)		(1.9)		(1.7)		(1.7)		(1.7)
Amortization of net loss	2.8		2.0		2.0		2.7		2.1		2.1
Plan curtailments	—		1.5		—		—		1.3		—
Amortization of unrecognized prior service cost (A)	(6.9)		(8.4)		(8.4)		(5.0)		(6.1)		(6.1)
Total net periodic benefit income	(2.3)		(2.3)		(2.5)		(1.3)		(1.0)		(1.2)
Less: Amount paid by unconsolidated affiliates (B)	(0.5)		(0.7)		(0.6)
Plus: Amount allocated from OGE Energy (B)							(0.5)		(0.5)		(0.6)
Net periodic benefit income	$	(1.8)	$	(1.6)	$	(1.9)	$	(1.8)	$	(1.5)	$	(1.8)

(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)	2021		2020		2019
Increase of regulatory liability related to postretirement expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A)	$	0.4	$	0.2	$	1.0
Deferral of postretirement expense related to postretirement plan curtailment charges included in the above line item:
Oklahoma jurisdiction (A)	$	—	$	(1.4)	$	—
Arkansas jurisdiction (A)	$	—	$	(0.1)	$	—

(A)Included in the pension regulatory asset or liability in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.

Schedule of Capitalized Pension and Postretirement Cost [Table Text Block]


	OGE Energy						OG&E
(In millions)	2021		2020		2019		2021		2020		2019
Capitalized portion of net periodic pension benefit cost	$	3.4	$	3.8	$	3.6	$	2.9	$	3.1	$	3.0
Capitalized portion of net periodic postretirement benefit cost	$	0.2	$	0.2	$	0.2	$	0.1	$	0.1	$	0.1

Schedule of Assumptions Used [Table Text Block]

Rate Assumptions


	Pension Plan and Restoration of Retirement Income Plan						Postretirement Benefit Plans
Year Ended December 31	2021		2020		2019		2021		2020		2019
Assumptions to determine benefit obligations:
Discount rate	2.75	%	2.30	%	3.15	%	2.80	%	2.45	%	3.25	%
Rate of compensation increase	4.20	%	4.20	%	4.20	%	N/A		N/A		N/A
Interest crediting rate	3.50	%	3.50	%	4.00	%	N/A		N/A		N/A




Assumptions to determine net periodic benefit cost:
Discount rate	2.63	%	2.88	%	3.63	%	2.45	%	3.25	%	4.30	%
Expected return on plan assets	7.00	%	7.50	%	7.50	%	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	%	4.00	%	4.00	%	N/A		N/A		N/A

N/A - not applicable

Projected Benefit Obligation Funded Status Thresholds [Table Text Block]


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 [Table Text Block]

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 [Table Text Block]


(In millions)	December 31, 2021		Level 1		Level 3
Group retiree medical insurance contract	$	28.1	$	—	$	28.1

Mutual funds	16.2		16.2		—


Total OGE Energy plan investments	$	44.3	$	16.2	$	28.1
Plan investments attributable to affiliates	(4.4)
Total OG&E plan investments	$	39.9


(In millions)	December 31, 2020		Level 1		Level 3
Group retiree medical insurance contract	$	33.4	$	—	$	33.4

Mutual funds	14.2		14.2		—


Total OGE Energy plan investments	$	47.6	$	14.2	$	33.4
Plan investments attributable to affiliates	(4.9)
Total OG&E plan investments	$	42.7

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]

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)	2021
Group retiree medical insurance contract:
Beginning balance	$	33.4
Claims paid	(4.9)
Net unrealized losses related to instruments held at the reporting date	(1.1)
Investment fees	(0.1)
Realized losses	(0.1)
Interest income	0.7
Dividend income	0.2
Ending balance	$	28.1

Schedule of Expected Benefit Payments [Table Text Block]


(In millions)	OGE Energy		OG&E
2022	$	95.3	$	38.8
2023	$	37.0	$	30.7
2024	$	38.4	$	30.6
2025	$	36.7	$	28.7
2026	$	35.2	$	28.3
2027-2031	$	167.4	$	126.6


(In millions)	OGE Energy		OG&E
2022	$	12.5	$	9.6
2023	$	12.2	$	9.3
2024	$	10.6	$	8.0
2025	$	10.1	$	7.6
2026	$	9.7	$	7.2
After 2026	$	40.3	$	30.2

Defined Benefit Plan, Plan Assets, Category


(In millions)	December 31, 2021		Level 1		Level 2		Net Asset Value (A)
Common stocks	$	86.1	$	86.1	$	—	$	—
U.S. Treasury notes and bonds (B)	135.2		135.2		—		—
Mortgage- and asset-backed securities	24.6		—		24.6		—
Corporate fixed income and other securities	107.0		—		107.0		—
Commingled fund (C)	23.6		—		—		23.6
Foreign government bonds	0.9		—		0.9		—
U.S. municipal bonds	1.4		—		1.4		—

Money market fund	5.5		—		—		5.5
Mutual fund	99.8		99.8		—		—
Preferred stocks	1.1		1.1		—		—
U.S. Treasury futures:


Cash collateral	0.6		0.6		—		—
Forward contracts:
Receivable (foreign currency)	0.1		—		0.1		—

Total Pension Plan investments	485.9		$	322.8	$	134.0	$	29.1

Interest and dividends receivable	2.1
Payable to broker for securities purchased	(2.0)
Total OGE Energy Pension Plan assets	$	486.0
Pension Plan investments attributable to affiliates	(133.0)
Total OG&E Pension Plan assets	$	353.0

(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.


(In millions)	December 31, 2020		Level 1		Level 2		Net Asset Value (A)

Common stocks	$	252.3	$	252.3	$	—	$	—


U.S. Treasury notes and bonds (B)	134.3		134.3		—		—
Mortgage- and asset-backed securities	29.3		—		29.3		—


Corporate fixed income and other securities	116.6		—		116.6		—

Commingled fund (C)	25.4		—		—		25.4
Foreign government bonds	4.6		—		4.6		—
U.S. municipal bonds	1.8		—		1.8		—

Money market fund	8.8		—		—		8.8

Mutual fund	9.2		9.2		—		—
Preferred stocks	0.6		0.6		—		—
U.S. Treasury Futures:


Cash collateral	0.7		0.7		—		—
Forward contracts:
Receivable (foreign currency)	0.1		—		0.1		—

Total Pension Plan investments	583.7		$	397.1	$	152.4	$	34.2
Receivable from broker for securities sold	0.2
Interest and dividends receivable	2.2
Payable to broker for securities purchased	(15.8)
Total OGE Energy Pension Plan assets	$	570.3
Pension Plan investments attributable to affiliates	(150.0)
Total OG&E Pension Plan assets	$	420.3

(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.

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Regulatory Assets and Liabilities [Table Text Block]

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


December 31 (In millions)	2021		2020
REGULATORY ASSETS
Current:
Fuel clause under recoveries	$	151.9	$	—
Oklahoma Energy Efficiency Rider under recoveries (A)	11.7		—
SPP cost tracker under recovery (A)	9.3		7.0
Generation Capacity Replacement Rider under recovery (A)	1.0		4.4
Other (A)	8.7		8.4
Total current regulatory assets	$	182.6	$	19.8
Non-current:
Oklahoma Winter Storm Uri costs	$	747.9	$	—
Oklahoma deferred storm expenses	172.8		158.8
Benefit obligations regulatory asset	109.2		164.9
Arkansas Winter Storm Uri costs	88.9		—
Pension tracker	42.9		18.1
Sooner Dry Scrubbers	18.9		19.7
Arkansas deferred pension expenses	12.1		9.3
Unamortized loss on reacquired debt	8.9		9.7
COVID-19 impacts	8.2		6.4
Frontier Plant deferred expenses	6.7		6.4
Smart Grid	3.9		11.2

Other	10.4		11.1
Total non-current regulatory assets	$	1,230.8	$	415.6
REGULATORY LIABILITIES
Current:

Fuel clause over recoveries	$	—	$	28.6



Other (B)	2.5		6.5
Total current regulatory liabilities	$	2.5	$	35.1
Non-current:
Income taxes refundable to customers, net	$	930.7	$	867.4
Accrued removal obligations, net	296.8		316.8

Other	3.6		4.7
Total non-current regulatory liabilities	$	1,231.1	$	1,188.9

(A)Included in Other Current Assets in the balance sheets.

(B)Included in Other Current Liabilities in the balance sheets.

Components of Benefit Obligation Regulatory Asset [Table Text Block]

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


December 31 (In millions)	2021		2020
Pension Plan and Restoration of Retirement Income Plan:
Net loss	$	89.6	$	147.3

Postretirement Benefit Plans:
Net loss	23.2		26.2
Prior service cost	(3.6)		(8.6)
Total	$	109.2	$	164.9

Schedule of Jointly Owned Utility Plants [Table Text Block]

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, 2021 (In millions)	Percentage Ownership		Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
McClain Plant (A)	77	%	$	258.5	$	109.0	$	149.5
Redbud Plant (A)(B)	51	%	$	538.2	$	203.4	$	334.8

(A)Construction work in progress was $0.2 million and $0.2 million for the McClain and Redbud Plants, respectively.

(B)This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $72.8 million.


December 31, 2020 (In millions)	Percentage Ownership		Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
McClain Plant (A)	77	%	$	257.1	$	96.0	$	161.1
Redbud Plant (A)(B)	51	%	$	531.8	$	181.9	$	349.9

(A)Construction work in progress was $0.1 million and $1.8 million for the McClain and Redbud Plants, respectively.

(B)This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $67.3 million.

Property, Plant and Equipment [Table Text Block]

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


December 31, 2021 (In millions)	Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
OG&E:
Distribution assets	$	5,225.8	$	1,477.5	$	3,748.3
Electric generation assets (A)	5,037.9		1,839.0		3,198.9
Transmission assets (B)	3,038.2		627.0		2,411.2
Intangible plant	301.1		171.7		129.4
Other property and equipment	542.7		203.7		339.0
OG&E property, plant and equipment	14,145.7		4,318.9		9,826.8
Non-OG&E property, plant and equipment	6.1		—		6.1
Total OGE Energy property, plant and equipment	$	14,151.8	$	4,318.9	$	9,832.9

(A)This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $72.8 million.

(B)This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.9 million.


December 31, 2020 (In millions)	Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
OG&E:
Distribution assets	$	4,809.9	$	1,422.1	$	3,387.8
Electric generation assets (A)	4,932.2		1,713.6		3,218.6
Transmission assets (B)	2,944.6		591.7		2,352.9
Intangible plant	254.1		153.9		100.2
Other property and equipment	495.3		186.3		309.0
OG&E property, plant and equipment	13,436.1		4,067.6		9,368.5
Non-OG&E property, plant and equipment	6.1		—		6.1
Total OGE Energy property, plant and equipment	$	13,442.2	$	4,067.6	$	9,374.6

(A)This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $67.3 million.

(B)This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.9 million.

Schedule of Change in Asset Retirement Obligation [Table Text Block]

The following table presents changes to OG&E's asset retirement obligations during the years ended December 31, 2021 and 2020.


(In millions)	2021		2020
Balance at January 1	$	79.6	$	73.5
Accretion expense	0.6		0.5
Revisions in estimated cash flows (A)	—		5.8

Liabilities settled (B)	—		(0.2)
Balance at December 31	$	80.2	$	79.6

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

(B)Asset retirement obligations were settled for asbestos removal at one of OG&E's generating facilities

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The following table presents changes in the components of accumulated other comprehensive income (loss) attributable to OGE Energy during 2020 and 2021. 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)		Other Comprehensive Gain (Loss) from Unconsolidated Affiliates		Total





Balance at December 31, 2019	$	(34.9)	$	(0.2)	$	4.2	$	3.6	$	(0.6)	$	(27.9)
Other comprehensive income (loss) before reclassifications	(5.1)		—		(2.4)		—		(0.7)		(8.2)
Amounts reclassified from accumulated other comprehensive income (loss)	3.9		—		(0.1)		(1.7)		—		2.1
Curtailment	—		—		(0.3)		—		—		(0.3)
Settlement cost	2.2		—		—		—		—		2.2
Net current period other comprehensive income (loss)	1.0		—		(2.8)		(1.7)		(0.7)		(4.2)
Balance at December 31, 2020	(33.9)		(0.2)		1.4		1.9		(1.3)		(32.1)
Other comprehensive income (loss) before reclassifications	1.4		(1.1)		(0.7)		—		1.3		0.9
Amounts reclassified from accumulated other comprehensive income (loss)	1.6		0.1		0.1		(1.4)		—		0.4

Settlement cost	6.0		—		—		—		—		6.0
Net current period other comprehensive income (loss)	9.0		(1.0)		(0.6)		(1.4)		1.3		7.3
Balance at December 31, 2021	$	(24.9)	$	(1.2)	$	0.8	$	0.5	$	—	$	(24.8)

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

The following table presents significant amounts reclassified out of accumulated other comprehensive income (loss) by the respective line items in net income (loss) during the years ended December 31, 2021 and 2020.


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)	2021		2020









Amortization of Pension Plan and Restoration of Retirement Income Plan items:
Actuarial losses	$	(2.5)	$	(5.1)	(A)
Prior service cost	(0.1)		—		(A)
Settlement cost	(8.7)		(2.9)		(A)
	(11.3)		(8.0)		Income (Loss) Before Taxes
	(3.6)		(1.9)		Income Tax Expense (Benefit)


	$	(7.7)	$	(6.1)	Net Income (Loss)

Amortization of postretirement benefit plans items:

Prior service credit	$	1.8	$	2.3	(A)
Curtailment cost	—		0.4		(A)
Actuarial gains (losses)	(0.1)		0.1		(A)
	1.7		2.8		Income (Loss) Before Taxes
	0.4		0.7		Income Tax Expense (Benefit)
	$	1.3	$	2.1	Net Income (Loss)



Total reclassifications for the period, net of tax	$	(6.4)	$	(4.0)	Net Income (Loss)

(A)These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 13 for additional information).

Investment in Unconsolidated Affiliate Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) - USD ($)
$ in Millions

11 Months Ended

12 Months Ended

Dec. 02, 2021

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Schedule of Equity Method Investments [Line Items]

Timing Differences Related to Equity Method Investee Net Income

$ 9.0

$ 0.0

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

25.50%

Proportionate Unconsolidated Affiliate Net Income

$ 119.8

$ 13.2

$ 91.8

Amortization of basis difference and dilution recognition

^[1]

50.0

98.8

22.1

Equity Method Investment, Other than Temporary Impairment

^[2]

0.0

780.0

0.0

169.8

^[3]

$ 169.8

(668.0)

^[3],[4]

113.9

^[3]

Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]

737.3

(173.7)

433.6

Schedule of Equity Method Investments [Line Items]

470.0

52.0

360.0

Natural Gas Midstream Operations [Member]

$ 461.0

52.0

360.0

Schedule of Equity Method Investments [Line Items]

169.8

(668.0)

^[4]

113.9

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

$ 385.0

$ (515.0)

$ 81.4

[1]	Includes loss on dilution, net of proportional basis difference recognition.
[2]	Effective March 31, 2020, OGE Energy estimated the fair value of its investment in Enable was below the book value and concluded the decline in value was not temporary due to the severity of the decline and recent rapid deterioration, as well as the near term future outlook, of the midstream oil and gas industry. Accordingly, OGE Energy recorded a $780.0 million impairment on its investment in Enable in 2020. Further information concerning the fair value method used to measure the impairment on OGE Energy's investment in Enable can be found in Note 7.
[3]	For the year ended December 31, 2020, Enable recorded a $225.0 million impairment on its SESH equity method investment. Enable estimated the fair value of this equity method investment was below the carrying value at September 30, 2020 and concluded the decline in value was other than temporary due to the expiration of a transportation contract and the current status of renewal negotiations. The impairment ran through OGE Energy's portion of Enable net income and was offset by basis differences that flow through the amortization of basis difference and dilution recognition line item above
[4]	In March 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Notes 5 and 7.

Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Stock-Based Compensation [Abstract]


	OGE Energy						OG&E
Year Ended December 31 (In millions)	2021		2020		2019		2021		2020		2019
Performance units:
Total shareholder return	$	7.5	$	7.9	$	8.7	$	1.8	$	2.3	$	3.0
Earnings per share	—		1.0		4.3		—		0.3		1.5
Total performance units	7.5		8.9		13.0		1.8		2.6		4.5
Restricted stock units	2.3		0.9		0.9		0.4		0.4		0.4


Total compensation expense	$	9.8	$	9.8	$	13.9	$	2.2	$	3.0	$	4.9
Income tax benefit	$	2.5	$	2.5	$	3.6	$	0.6	$	0.8	$	1.3

Performance Units Total Shareholder Return Valuation Assumptions [Table Text Block]

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


	OGE Energy									OG&E
	2021			2020			2019			2021			2020			2019
Number of units granted	249,909			201,552			208,647			68,720			67,975			68,396
Fair value of units granted	$	38.14		$	38.03		$	47.00		$	38.14		$	38.03		$	47.00
Expected dividend yield	4.7		%	3.5		%	4.0		%	4.7		%	3.5		%	4.0		%
Expected price volatility	29.0		%	15.0		%	17.0		%	29.0		%	15.0		%	17.0		%
Risk-free interest rate	0.22		%	1.17		%	2.47		%	0.22		%	1.17		%	2.47		%
Expected life of units (in years)	2.84			2.85			2.86			2.85			2.85			2.86

Restricted Stock Valuation Assumptions [Table Text Block]

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


	OGE Energy						OG&E
	2021		2020		2019		2021		2020		2019
Restricted stock units granted	89,197		67,193		75,929		22,911		22,665		26,141
Fair value of restricted stock units granted	$	31.11	$	43.69	$	41.71	$	30.91	$	43.69	$	41.63

Share-based Compensation, Activity [Table Text Block]


OGE Energy	Performance Units								Restricted Stock Units
	Total Shareholder Return				Earnings Per Share
(Dollars in millions)	Number of Units		Aggregate Intrinsic Value		Number of Units		Aggregate Intrinsic Value		Number of Shares	Aggregate Intrinsic Value
Units/shares outstanding at 12/31/20	612,262				79,002				124,919
Granted	249,909	(A)			—				89,197

Converted	(236,990)	(B)	$	5.4	(79,002)	(B)	$	2.7	—
Vested	N/A				N/A				(53,274)	$	2.2
Forfeited	(43,929)				—				(27,171)
Units/shares outstanding at 12/31/21	581,252		$	17.5	—		$	—	133,671	$	5.1
Units/shares fully vested at 12/31/21	172,748		$	—	—		$	—	47,907	$	2.0


OG&E	Performance Units								Restricted Stock Units
	Total Shareholder Return				Earnings Per Share
(Dollars in millions)	Number of Units		Aggregate Intrinsic Value		Number of Units		Aggregate Intrinsic Value		Number of Shares		Aggregate Intrinsic Value
Units/shares outstanding at 12/31/20	182,363				25,235				34,130
Granted	68,720	(A)			—				22,911
Converted	(75,693)	(B)	$	1.7	(25,235)	(B)	$	0.8	—
Vested	N/A				N/A				(12,461)		$	0.6
Forfeited	(14,132)				—				(8,986)
Employee migration	52	(C)			—	(C)			19	(C)
Units/shares outstanding at 12/31/21	161,310		$	4.8	—		$	—	35,613		$	1.4
Units/shares fully vested at 12/31/21	48,195		$	—	—		$	—	11,241		$	0.5

(B)These amounts represent performance units that vested at December 31, 2020 which were settled in February 2021.

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

Schedule of Nonvested Share Activity [Table Text Block]


OGE Energy	Performance Units -				Restricted Stock Units
	Total Shareholder Return
	Number of Units		Weighted-Average Grant Date Fair Value			Number of Shares	Weighted-Average Grant Date Fair Value
Units/shares non-vested at 12/31/20	375,272		$	42.51		124,919	$	42.69
Granted	249,909	(A)	$	38.14		89,197	$	31.11

Vested	(172,748)		$	47.00		(53,274)	$	41.59
Forfeited	(43,929)		$	41.02		(27,171)	$	42.37
Units/shares non-vested at 12/31/21	408,504		$	38.05		133,671	$	35.64


OG&E	Performance Units -				Restricted Stock Units
	Total Shareholder Return
	Number of Units		Weighted-Average Grant Date Fair Value			Number of Shares		Weighted-Average Grant Date Fair Value
Units/shares non-vested at 12/31/20	106,670		$	42.49		34,130		$	42.67
Granted	68,720	(A)	$	38.14		22,911		$	30.91

Vested	(48,195)		$	47.00		(12,461)		$	45.67
Forfeited	(14,132)		$	41.12		(8,986)		$	42.51
Employee migration	52	(B)	$	41.01		19	(B)	$	37.71
Units/shares non-vested at 12/31/21	113,115		$	38.10		35,613		$	35.52

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

Fair Value of Vested Performance Units and Restricted Stock [Table Text Block]

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)	2021		2020		2019		2021		2020		2019
Performance units:
Total shareholder return	$	8.1	$	8.7	$	9.3	$	2.3	$	2.8	$	3.2
Earnings per share	$	—	$	2.5	$	5.2	$	—	$	0.8	$	0.9
Restricted stock units	$	2.2	$	0.1	$	0.1	$	0.5	$	0.1	$	—

Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]


	OGE Energy			OG&E
December 31, 2021	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 - total shareholder return	$	7.5	1.71	$	2.0	1.72


Restricted stock units	3.5		1.48	0.8		1.39
Total unrecognized compensation cost	$	11.0		$	2.8

Fair Value Measurements Carrying and Fair Value Amounts (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt	$ 3,996.5	$ 3,494.4
Redeemable Noncontrolling Interest, Equity, Carrying Amount	785.1
Equity Securities, FV-NI, Current	785.1	0.0
OG&E Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt	3,851.8	3,349.6
Long-Term Debt, Fair Value	4,460.2	4,182.1
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
OG&E Tinker Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt	9.3	9.4
Long-Term Debt, Fair Value	10.0	10.7
OGE Energy Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt	499.9	0.0
Long-Term Debt, Fair Value	497.8	0.0
Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 0.0	$ 0.0

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

Summary of Significant Accounting Policies

Organization

OGE Energy charges operating costs to OG&E, and prior to December 2, 2021, OGE Energy charged operating costs to Enable, based on several factors. Operating costs directly related to OG&E and Enable are assigned as such. Operating costs incurred for the benefit of OG&E and Enable are allocated either as overhead based primarily on labor costs or using the "Distrigas" method. The "Distrigas" method 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. OGE Energy believes this method provides a reasonable basis for allocating common expenses.

Use of Estimates

Cash and Cash Equivalents

Allowance for Uncollectible Accounts Receivable

Investment in Unconsolidated Affiliates

Allowance for Funds Used During Construction

Collection of Sales Tax

Revenue Recognition

General

Integrated Market and Transmission

Other Revenues

Fuel Adjustment Clauses

Income Taxes

Accrued Vacation

Comprehensive Income (Loss) Note [Text Block]

Accumulated Other Comprehensive Income (Loss)

The following table presents changes in the components of accumulated other comprehensive income (loss) attributable to OGE Energy during 2020 and 2021. 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)		Other Comprehensive Gain (Loss) from Unconsolidated Affiliates		Total





Balance at December 31, 2019	$	(34.9)	$	(0.2)	$	4.2	$	3.6	$	(0.6)	$	(27.9)
Other comprehensive income (loss) before reclassifications	(5.1)		—		(2.4)		—		(0.7)		(8.2)
Amounts reclassified from accumulated other comprehensive income (loss)	3.9		—		(0.1)		(1.7)		—		2.1
Curtailment	—		—		(0.3)		—		—		(0.3)
Settlement cost	2.2		—		—		—		—		2.2
Net current period other comprehensive income (loss)	1.0		—		(2.8)		(1.7)		(0.7)		(4.2)
Balance at December 31, 2020	(33.9)		(0.2)		1.4		1.9		(1.3)		(32.1)
Other comprehensive income (loss) before reclassifications	1.4		(1.1)		(0.7)		—		1.3		0.9
Amounts reclassified from accumulated other comprehensive income (loss)	1.6		0.1		0.1		(1.4)		—		0.4

Settlement cost	6.0		—		—		—		—		6.0
Net current period other comprehensive income (loss)	9.0		(1.0)		(0.6)		(1.4)		1.3		7.3
Balance at December 31, 2021	$	(24.9)	$	(1.2)	$	0.8	$	0.5	$	—	$	(24.8)


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)	2021		2020









Amortization of Pension Plan and Restoration of Retirement Income Plan items:
Actuarial losses	$	(2.5)	$	(5.1)	(A)
Prior service cost	(0.1)		—		(A)
Settlement cost	(8.7)		(2.9)		(A)
	(11.3)		(8.0)		Income (Loss) Before Taxes
	(3.6)		(1.9)		Income Tax Expense (Benefit)


	$	(7.7)	$	(6.1)	Net Income (Loss)

Amortization of postretirement benefit plans items:

Prior service credit	$	1.8	$	2.3	(A)
Curtailment cost	—		0.4		(A)
Actuarial gains (losses)	(0.1)		0.1		(A)
	1.7		2.8		Income (Loss) Before Taxes
	0.4		0.7		Income Tax Expense (Benefit)
	$	1.3	$	2.1	Net Income (Loss)



Total reclassifications for the period, net of tax	$	(6.4)	$	(4.0)	Net Income (Loss)

(A)These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 13 for additional information).

Asset Retirement Obligation Disclosure [Text Block]

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 five to 68 years. Asset retirement obligations are included in Other Deferred Credits in the Registrants' balance sheets.

The following table presents changes to OG&E's asset retirement obligations during the years ended December 31, 2021 and 2020.


(In millions)	2021		2020
Balance at January 1	$	79.6	$	73.5
Accretion expense	0.6		0.5
Revisions in estimated cash flows (A)	—		5.8

Liabilities settled (B)	—		(0.2)
Balance at December 31	$	80.2	$	79.6

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

(B)Asset retirement obligations were settled for asbestos removal at one of OG&E's generating facilitiesAccruals 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 $25.8 million and $25.0 million in accrued environmental liabilities at December 31, 2021 and 2020, respectively, which are included in OG&E's asset retirement obligations.

Property, Plant and Equipment Disclosure [Text Block]

Property, Plant and Equipment


December 31, 2021 (In millions)	Percentage Ownership		Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
McClain Plant (A)	77	%	$	258.5	$	109.0	$	149.5
Redbud Plant (A)(B)	51	%	$	538.2	$	203.4	$	334.8

(A)Construction work in progress was $0.2 million and $0.2 million for the McClain and Redbud Plants, respectively.

(B)This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $72.8 million.


December 31, 2020 (In millions)	Percentage Ownership		Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
McClain Plant (A)	77	%	$	257.1	$	96.0	$	161.1
Redbud Plant (A)(B)	51	%	$	531.8	$	181.9	$	349.9

(A)Construction work in progress was $0.1 million and $1.8 million for the McClain and Redbud Plants, respectively.

(B)This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $67.3 million.

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


December 31, 2021 (In millions)	Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
OG&E:
Distribution assets	$	5,225.8	$	1,477.5	$	3,748.3
Electric generation assets (A)	5,037.9		1,839.0		3,198.9
Transmission assets (B)	3,038.2		627.0		2,411.2
Intangible plant	301.1		171.7		129.4
Other property and equipment	542.7		203.7		339.0
OG&E property, plant and equipment	14,145.7		4,318.9		9,826.8
Non-OG&E property, plant and equipment	6.1		—		6.1
Total OGE Energy property, plant and equipment	$	14,151.8	$	4,318.9	$	9,832.9

(A)This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $72.8 million.

(B)This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.9 million.


December 31, 2020 (In millions)	Total Property, Plant and Equipment		Accumulated Depreciation		Net Property, Plant and Equipment
OG&E:
Distribution assets	$	4,809.9	$	1,422.1	$	3,387.8
Electric generation assets (A)	4,932.2		1,713.6		3,218.6
Transmission assets (B)	2,944.6		591.7		2,352.9
Intangible plant	254.1		153.9		100.2
Other property and equipment	495.3		186.3		309.0
OG&E property, plant and equipment	13,436.1		4,067.6		9,368.5
Non-OG&E property, plant and equipment	6.1		—		6.1
Total OGE Energy property, plant and equipment	$	13,442.2	$	4,067.6	$	9,374.6

(A)This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $67.3 million.

(B)This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.9 million.

OG&E's unamortized computer software costs, included in intangible plant above, were $103.7 million and $89.7 million at December 31, 2021 and 2020, respectively. OG&E's amortization expense for computer software costs was $18.1 million, $14.9 million and $11.0 million for the years ended December 31, 2021, 2020 and 2019, respectively.

Depreciation and Amortization

Inventory Disclosure [Text Block]

Fuel Inventories

Summary of Significant Accounting Policies [Text Block]

Accounting Records

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


December 31 (In millions)	2021		2020
REGULATORY ASSETS
Current:
Fuel clause under recoveries	$	151.9	$	—
Oklahoma Energy Efficiency Rider under recoveries (A)	11.7		—
SPP cost tracker under recovery (A)	9.3		7.0
Generation Capacity Replacement Rider under recovery (A)	1.0		4.4
Other (A)	8.7		8.4
Total current regulatory assets	$	182.6	$	19.8
Non-current:
Oklahoma Winter Storm Uri costs	$	747.9	$	—
Oklahoma deferred storm expenses	172.8		158.8
Benefit obligations regulatory asset	109.2		164.9
Arkansas Winter Storm Uri costs	88.9		—
Pension tracker	42.9		18.1
Sooner Dry Scrubbers	18.9		19.7
Arkansas deferred pension expenses	12.1		9.3
Unamortized loss on reacquired debt	8.9		9.7
COVID-19 impacts	8.2		6.4
Frontier Plant deferred expenses	6.7		6.4
Smart Grid	3.9		11.2

Other	10.4		11.1
Total non-current regulatory assets	$	1,230.8	$	415.6
REGULATORY LIABILITIES
Current:

Fuel clause over recoveries	$	—	$	28.6



Other (B)	2.5		6.5
Total current regulatory liabilities	$	2.5	$	35.1
Non-current:
Income taxes refundable to customers, net	$	930.7	$	867.4
Accrued removal obligations, net	296.8		316.8

Other	3.6		4.7
Total non-current regulatory liabilities	$	1,231.1	$	1,188.9

(A)Included in Other Current Assets in the balance sheets.

(B)Included in Other Current Liabilities in the balance sheets.

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 program costs related to the Energy Efficiency Program in Oklahoma through the Energy Efficiency Rider, which operates on a three-year program cycle. The previous program cycle, which ran through 2021, included 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. A new program cycle related to 2022 through 2024 programs was approved on February 1, 2022, as further discussed in Note 16.

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.

OG&E recovers 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 River Valley plant and, beginning May 1, 2021, the Frontier plant, through the Generation Capacity Replacement Rider. The OCC also authorized OG&E to defer the same costs through April 30, 2021 related to its investment in the Frontier plant to a regulatory asset, and recovery of these costs will be considered in future rate proceedings.

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. OG&E's natural gas costs for the month of February 2021 exceeded the total cost for all of 2020. The OCC allowed OG&E to create a regulatory asset for the Oklahoma portion of all deferred costs with an initial carrying charge based on the effective cost of the related debt financing for an amortization period to be determined at a later date. See Note 16 for further discussion of the Oklahoma securitization process related to this regulatory asset. The APSC allowed OG&E to create a regulatory asset for the Arkansas portion of all deferred costs with an initial carrying charge equal to the current customer deposit interest rate to be recovered over a period of 10 years beginning in May 2021.

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-year period in accordance with historical practice. To mitigate customer impact, OG&E has agreed to recover the portion related to 2020 excess storm costs through the Storm Cost Recovery Rider over a ten-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)	2021		2020
Pension Plan and Restoration of Retirement Income Plan:
Net loss	$	89.6	$	147.3

Postretirement Benefit Plans:
Net loss	23.2		26.2
Prior service cost	(3.6)		(8.6)
Total	$	109.2	$	164.9

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.

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 13.

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 are related to the suspension of or delay in disconnection of service and additional expenses associated with ensuring the continuity of utility service.

OG&E deferred to a regulatory asset the incremental and stranded costs that were accumulated during Smart Grid deployment, including (i) costs for web portal access, (ii) costs for education and home energy reports and (iii) stranded costs associated with OG&E's analog electric meters, which have been replaced by smart meters. As approved by the OCC and APSC, these costs are being recovered over a six-year period ending in 2022 in Oklahoma and 2023 in Arkansas.

Income taxes refundable to customers, net, represents the reduction in accumulated deferred income taxes resulting from the reduction in the federal income tax rate as part of the Tax Cuts and Jobs Act of 2017 and other state tax rate changes and includes income taxes recoverable from customers that represent income tax benefits previously used to reduce OG&E's revenues (treated as regulatory assets). These 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 retirement costs previously recovered from ratepayers for other than legal obligations.

Reclassifications [Text Block]

ReclassificationsCertain prior year amounts have been reclassified to conform to the current year presentation. OGE Energy changed the classification of certain investments in its 2020 consolidated balance sheet to conform with current year presentation. The prior year reclassification of $23.1 million from Investment in Unconsolidated Affiliates to Other Property and Investments did not impact previously reported current or total assets.

Investment

Investment in Equity Securities of Energy Transfer

OGE Energy accounts 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." OGE Energy presents the Energy Transfer equity securities at estimated fair value in its balance sheet. OGE Energy presents realized and unrealized gains and losses of the equity securities, as well as dividend income from the investment, within the Other Income (Expense) section in its statement of income, as appropriate. During the period between December 2, 2021 and December 31, 2021, OGE Energy recognized an unrealized loss of $8.6 million related to its investment in Energy Transfer's equity securities.

On January 25, 2022, Energy Transfer announced a 15 percent increase in its quarterly cash distribution, resulting in a distribution of $0.175 per unit on its outstanding common units that was paid on February 18, 2022.

Long-Term Debt (Details) - USD ($) $ in Millions	12 Months Ended
Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total long-term debt	$ 3,996.5	$ 3,494.4
Percent of Principal Amount Subject to Optional Tender	100.00%
Long-term Debt, Maturities, Repayments of Principal in Year Two	$ 500.0
Long-term Debt, Maturities, Repayments of Principal in Year Four	79.4
Debt Instrument, Face Amount	$ 1,000.0
Garfield Industrial Authority, January 1, 2025 [Member]
Debt Instrument [Line Items]
Date Due	Jan. 01, 2025
Muskogee Industrial Authority, Janaury 1, 2025 [Member]
Debt Instrument [Line Items]
Date Due	Jan. 01, 2025
Muskogee Industrial Authority, June 1, 2027 [Member]
Debt Instrument [Line Items]
Date Due	Jun. 01, 2027
Redeemable during the next 12 months
Debt Instrument [Line Items]
Total long-term debt	$ 135.4
Redeemable during the next 12 months \| Garfield Industrial Authority, January 1, 2025 [Member]
Debt Instrument [Line Items]
Long term debt, gross	47.0	47.0
Redeemable during the next 12 months \| Muskogee Industrial Authority, Janaury 1, 2025 [Member]
Debt Instrument [Line Items]
Long term debt, gross	32.4	32.4
Redeemable during the next 12 months \| Muskogee Industrial Authority, June 1, 2027 [Member]
Debt Instrument [Line Items]
Long term debt, gross	56.0	56.0
Senior Notes [Member] \| Series Due April 1, 2030
Debt Instrument [Line Items]
Long term debt, gross	$ 300.0	300.0
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Date Due	Apr. 01, 2030
Senior Notes [Member] \| Series Due May 26, 2023
Debt Instrument [Line Items]
Long term debt, gross	$ 500.0	$ 0.0
Debt Instrument, Interest Rate, Stated Percentage	0.553%
Date Due	May 26, 2023
Minimum [Member] \| Redeemable during the next 12 months \| Garfield Industrial Authority, January 1, 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.11%
Minimum [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority, Janaury 1, 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.11%
Minimum [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority, June 1, 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.11%
Maximum [Member] \| Redeemable during the next 12 months \| Garfield Industrial Authority, January 1, 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.27%
Maximum [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority, Janaury 1, 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.33%
Maximum [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority, June 1, 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.27%

Leases, Codification Topic 842 (Tables)

12 Months Ended

Dec. 31, 2021

Leases [Abstract]

Lease, Cost


	OGE Energy						OG&E
	Year Ended December 31,						Year Ended December 31,
(In millions)	2021		2020		2019		2021		2020		2019












Operating lease cost	$	6.3	$	6.4	$	6.0	$	5.7	$	5.5	$	5.1
Cash paid for amounts included in the measurement of lease liabilities:

Operating cash flows for operating leases	$	6.3	$	6.4	$	5.6	$	5.7	$	5.5	$	4.8

Right-of-use assets obtained in exchange for new operating lease liabilities	$	—	$	1.4	$	10.7	$	—	$	1.4	$	10.7


	OGE Energy						OG&E
(Dollars in millions)	December 31, 2021			December 31, 2020			December 31, 2021			December 31, 2020
Right-of-use assets at period end (A)	$	33.0		$	37.6		$	33.0		$	37.0
Operating lease liabilities at period end (B)	$	37.6		$	42.3		$	37.6		$	41.7
Operating lease weighted-average remaining lease term (in years)	12.2			12.5			12.2			12.7
Operating lease weighted-average discount rate	3.9		%	3.9		%	3.9		%	3.9		%

(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)

2022	$	5.7	$	5.7
2023	5.1		5.1
2024	3.1		3.1
2025	3.0		3.0
2026	3.0		3.0
Thereafter	28.7		28.7
Total future minimum lease payments	48.6		48.6
Less: Imputed interest	11.0		11.0
Present value of net minimum lease payments	$	37.6	$	37.6

Summary of Significant Accounting Policies Accounting Records (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Regulatory Assets, Current	$ 182.6	$ 19.8
Regulatory Assets, Noncurrent	1,230.8	415.6
Deferred Storm and Property Reserve Deficiency, Current	2.7
Regulatory Liability, Current	2.5	35.1
Pension Plans, Defined Benefit [Member] \| Defined Benefit Plans Income Loss [Member]
Components of Benefit Obligation Regulatory Asset	89.6	147.3
Other Postretirement Benefit Plans, Defined Benefit [Member] \| Defined Benefit Plans Income Loss [Member]
Components of Benefit Obligation Regulatory Asset	23.2	26.2
Other Postretirement Benefit Plans, Defined Benefit [Member] \| Prior Service Cost [Member]
Components of Benefit Obligation Regulatory Asset	$ (3.6)	$ (8.6)

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

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]

Balance at January 1

$ 79.6

$ 73.5

Accretion expense

0.6

0.5

Revisions in estimated cash flows

^[1]

0.0

5.8

Liabilities settled

^[2]

0.0

(0.2)

Balance at December 31

$ 80.2

$ 79.6

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

Leases, Codification Topic 842 (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Leases [Abstract]

Lessee, Operating Lease, Contingent Liability

$ 6.8

Operating Lease, Cost

5.7

$ 5.5

$ 5.1

Operating Leased Assets [Line Items]

Cash Paid on Operating Leases

5.7

5.5

4.8

Operating Lease, Right-of-Use Asset

^[1]

33.0

37.0

Operating Lease, Liability

^[2]

$ 37.6

$ 41.7

Operating Lease, Weighted Average Remaining Lease Term

12 years 2 months 12 days

12 years 8 months 12 days

Operating Lease, Weighted Average Discount Rate, Percent

3.90%

Right-of-Use Asset Obtained in Exchange for Operating Lease Liability

$ 0.0

$ 1.4

10.7

Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months

5.7

Lessee, Operating Lease, Liability, Payments, Due Year Two

5.1

Lessee, Operating Lease, Liability, Payments, Due Year Three

3.1

Lessee, Operating Lease, Liability, Payments, Due Year Four

3.0

Lessee, Operating Lease, Liability, Payments, Due Year Five

3.0

Lessee, Operating Lease, Liability, Payments, Due after Year Five

28.7

Lessee, Operating Lease, Liability, Payments, Due

48.6

Lessee, Operating Lease, Liability, Undiscounted Excess Amount

11.0

Lessee, Operating Lease, Contingent Liability

6.8

Operating Lease, Cost

$ 5.7

$ 5.5

$ 5.1

[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.

Related Party Disclosures (Details) - USD ($) $ in Millions	11 Months Ended	12 Months Ended
Related Party Disclosures (Details) - USD ($) $ in Millions	Dec. 02, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Dividends, Common Stock		$ (265.0)		$ (325.0)
Expected Settlement Charge		19.4
Excluding Fuel Purchases [Member]
Related Party Transaction [Line Items]
Accounts receivable - unconsolidated affiliates		0.3	$ 2.0
Retained Earnings
Related Party Transaction [Line Items]
Dividends, Common Stock		265.0	0.0	325.0
Enable Midstream Partners [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	$ 13.3		15.1	15.9
Enable Midstream Partners [Member] \| Natural Gas Transportation [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	32.7		32.8	41.2
Enable Midstream Partners [Member] \| Natural Gas Purchases [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	$ (33.5)		2.7	(6.0)
Enable Midstream Partners [Member] \| Operating Costs Charged [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party		0.3	0.4	0.5
Enable Midstream Partners [Member] \| Employment Costs [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party		12.2	17.3	23.2
Og and E [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party		$ 139.3	$ 140.6	$ 149.8

Investment in Unconsolidated Affiliate (Details) - USD ($)
$ / shares in Units, $ in Millions

11 Months Ended

12 Months Ended

Dec. 02, 2021

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Jun. 30, 2021

May 01, 2013

Schedule of Equity Method Investments [Line Items]

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

25.50%

Distribution Made to Limited Partner, Distributions Declared, Per Unit

$ 0.175

Distributions received

$ 73.4

$ 91.7

$ 144.0

Increase in fair value of net assets

$ 2,200.0

Equity in earnings (losses) of unconsolidated affiliates

$ 169.8

^[1]

$ 169.8

(668.0)

^[1],[2]

113.9

^[1]

Share Price

$ 33.65

Investment Owned, Balance, Shares

110,982,805

95,389,721

Equity Method Investment, Other than Temporary Impairment

^[3]

$ 0.0

(780.0)

0.0

Proceeds from Sales of Assets, Investing Activities

$ 344.4

0.0

30.0

fees paid from disposition of assets

8.6

Natural Gas Midstream Operations [Member]

Schedule of Equity Method Investments [Line Items]

Equity in earnings (losses) of unconsolidated affiliates

169.8

$ (668.0)

^[2]

$ 113.9