0001021635-21-000104 | 10-Q | XBRL Viewer

^[1]

$ 1,621.0

$ 420.4

Other revenues

9.6

10.9

1,630.6

431.3

COST OF SALES

1,346.8

135.0

OPERATING EXPENSES

109.3

120.0

98.7

94.4

27.2

25.6

Operating expenses

235.2

240.0

Equity in earnings (losses) of unconsolidated affiliates

48.6

56.3

OTHER INCOME (EXPENSE)

53.2

(746.5)

^[2]

Allowance for equity funds used during construction

1.3

Other net periodic benefit expense

(1.4)

(0.5)

Other income

3.0

7.4

Other expense

(2.0)

(6.1)

Net other income (expense)

54.1

(744.4)

INTEREST EXPENSE

Interest on long-term debt

38.4

36.6

Allowance for borrowed funds used during construction

(0.8)

(0.5)

Interest on short-term debt and other interest charges

1.8

2.2

INCOME (LOSS) BEFORE TAXES

39.4

38.3

63.3

(726.4)

INCOME TAX EXPENSE (BENEFIT)

10.6

(234.6)

NET INCOME (LOSS)

$ 52.7

$ (491.8)

BASIC AVERAGE COMMON SHARES OUTSTANDING

200.1

200.2

DILUTED AVERAGE COMMON SHARES OUTSTANDING

200.1

200.2

BASIC EARNINGS (LOSS) PER AVERAGE COMMON SHARE

$ 0.26

$ (2.46)

DILUTED EARNINGS (LOSS) PER AVERAGE COMMON SHARE

$ 0.26

$ (2.46)

Other Comprehensive Income (Loss), Net of Tax

$ 3.5

$ (0.9)

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

56.2

(492.7)

1,621.0

420.4

Other revenues

9.6

10.9

1,630.6

431.3

COST OF SALES

1,346.8

135.0

OPERATING EXPENSES

110.3

121.0

98.7

94.4

25.7

23.9

Operating expenses

234.7

239.3

Allowance for equity funds used during construction

49.1

57.0

OTHER INCOME (EXPENSE)

1.3

Other net periodic benefit expense

(0.9)

(0.5)

Other income

1.7

1.5

Other expense

(0.4)

(0.5)

Net other income (expense)

1.7

1.8

INTEREST EXPENSE

Interest on long-term debt

38.4

36.6

Allowance for borrowed funds used during construction

(0.8)

(0.5)

Interest on short-term debt and other interest charges

0.8

INCOME (LOSS) BEFORE TAXES

38.4

36.9

12.4

21.9

INCOME TAX EXPENSE (BENEFIT)

1.2

2.0

NET INCOME (LOSS)

11.2

19.9

Other Comprehensive Income (Loss), Net of Tax

0.0

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

$ 11.2

$ 19.9

[1]

In February 2021, OG&E's service territory experienced an unprecedented, prolonged, cold spell that resulted in record winter peak demand for electricity and extremely high natural gas and purchased power prices. Operating revenues significantly increased due to increased cost of sales, which are recovered from customers, as a result of the February 2021 extreme cold weather event. For further discussion, see Note 15 and "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operation."

[2]

In 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Note 4

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other comprehensive income (loss), net of tax
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 52.7	$ (491.8)
Pension Plan and Restoration of Retirement Income Plan:
Amortization of deferred net loss, net of tax of $0.2 and $0.3, respectively	0.6	0.8
Settlement cost, net of tax of $1.0 and $0.0, respectively	3.1	0.0
Postretirement Benefit Plans:
Amortization of prior service credit, net of tax of ($0.1) and ($0.2), respectively	(0.3)	(0.4)
Other comprehensive gain (loss) from unconsolidated affiliates, net of tax of $0.0 and ($0.4), respectively	(0.1)	1.3
Other comprehensive income (loss), net of tax	3.5	(0.9)
Comprehensive income (loss)	$ 56.2	$ (492.7)

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) Parenthetical - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Pension Plan and Restoration of Retirement Income Plan:
Amortization of deferred net loss	$ 0.2	$ 0.3
Postretirement Benefit Plans:
Amortization of prior service cost	(0.1)	(0.2)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Noncontrolling Interest	0.0	(0.4)
Pension Plan [Member]
Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax	$ 1.0	$ 0.0

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

3 Months Ended

Mar. 31, 2021

Mar. 31, 2020

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

Net Income (Loss), Including Portion Attributable to Noncontrolling Interest

$ 52.7

$ (491.8)

Deferred income taxes and investment tax credits, net

98.7

94.4

8.7

(254.7)

Equity in (earnings) losses of unconsolidated affiliates

(53.2)

746.5

^[1]

Distributions from unconsolidated affiliates

18.3

33.5

Allowance for equity funds used during construction

(1.3)

Stock-based compensation expense

2.5

2.0

Regulatory assets

(859.9)

0.3

Regulatory liabilities

(16.3)

(11.7)

Other assets

(5.5)

2.6

Other liabilities

(45.4)

(9.4)

Change in certain current assets and liabilities:

Accounts receivable and accrued unbilled revenues, net

26.0

16.2

Increase (Decrease) in Income Taxes Receivable

1.7

0.0

Fuel, materials and supplies inventories

(7.0)

(5.0)

Fuel recoveries

(104.9)

50.3

Other current assets

(2.5)

3.6

Accounts payable

(28.7)

(32.8)

Other current liabilities

(24.1)

(38.8)

Net cash (used in) provided from operating activities

(940.2)

103.9

CASH FLOWS FROM INVESTING ACTIVITIES

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

(158.4)

(127.2)

Return of capital - unconsolidated affiliates

(0.6)

(0.9)

0.0

3.2

Net cash used in investing activities

(159.0)

(124.9)

Increase in short-term debt

1,183.1

263.0

Dividends paid on common stock

(81.7)

(79.3)

Net cash provided from financing activities

1,098.1

166.9

NET CHANGE IN CASH AND CASH EQUIVALENTS

(1.1)

145.9

CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD

1.1

0.0

CASH AND CASH EQUIVALENTS AT END OF PERIOD

0.0

145.9

Proceeds from (Payments for) Other Financing Activities

(3.3)

(7.1)

Treasury Stock, Value, Acquired, Cost Method

0.0

(9.7)

Net Income (Loss) Attributable to Parent

52.7

(491.8)

98.7

94.4

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

530.0

Premium on Common Stock

Net Income (Loss), Including Portion Attributable to Noncontrolling Interest

0.0

Treasury Stock, Value, Acquired, Cost Method

0.0

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

Deferred income taxes and investment tax credits, net

0.8

1.1

Allowance for equity funds used during construction

(1.3)

Stock-based compensation expense

0.4

0.9

Regulatory assets

(859.9)

0.3

Regulatory liabilities

(16.3)

(11.7)

Other assets

(4.4)

(0.1)

Other liabilities

(34.8)

(2.5)

Change in certain current assets and liabilities:

Accounts receivable and accrued unbilled revenues, net

27.7

18.9

Fuel, materials and supplies inventories

(7.0)

(5.0)

Fuel recoveries

(104.9)

50.3

Other current assets

0.6

(4.5)

Accounts payable

(29.1)

(27.0)

Other current liabilities

(22.4)

(45.5)

Net cash (used in) provided from operating activities

(939.9)

89.0

CASH FLOWS FROM INVESTING ACTIVITIES

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

(158.4)

(127.2)

Net cash used in investing activities

(158.4)

(127.2)

Net cash provided from financing activities

1,098.3

38.2

NET CHANGE IN CASH AND CASH EQUIVALENTS

0.0

CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD

0.0

CASH AND CASH EQUIVALENTS AT END OF PERIOD

0.0

Net Income (Loss) Attributable to Parent

11.2

19.9

Increase (Decrease) in Income Taxes Payable

98.7

94.4

0.8

Changes In Advances With Parent

568.3

38.2

OG&E [Member] | Premium on Common Stock

530.0

0.0

Net Income (Loss) Attributable to Parent

$ 0.0

[1]	In 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Note 4

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
CURRENT ASSETS
Cash and cash equivalents	$ 0.0	$ 1.1
Accounts Receivable, after Allowance for Credit Loss, Current	139.5	157.8
Accrued unbilled revenues	59.9	67.6
Income taxes receivable	6.4	8.1
Fuel inventories	39.4	36.5
Materials and supplies, at average cost	121.9	116.2
Fuel clause under recoveries	91.8	0.0
Other	43.8	41.2
Total current assets	502.7	428.5
OTHER PROPERTY AND INVESTMENTS
Investment in unconsolidated affiliates	432.8	397.4
Other	86.4	86.7
Total other property and investments	519.2	484.1
PROPERTY, PLANT AND EQUIPMENT
In service	13,420.4	13,296.7
Construction work in progress	185.6	145.5
Total property, plant and equipment	13,606.0	13,442.2
Less: accumulated depreciation	4,131.5	4,067.6
Property, Plant and Equipment, Net	9,474.5	9,374.6
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	1,269.7	415.6
Other	22.6	16.0
Total deferred charges and other assets	1,292.3	431.6
TOTAL ASSETS	11,788.7	10,718.8
CURRENT LIABILITIES
Short-term Debt	1,278.0	95.0
Accounts payable	244.8	251.5
Dividends payable	80.6	80.5
Customer deposits	80.7	81.1
Accrued taxes	37.7	55.7
Accrued interest	40.6	40.2
Accrued compensation	24.3	31.1
Fuel clause over recoveries	15.5	28.6
Other	34.3	33.7
Total current liabilities	1,836.5	697.4
LONG-TERM DEBT	3,495.0	3,494.4
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	182.5	231.4
Deferred income taxes	1,287.9	1,268.6
Deferred investment tax credits	10.9	10.9
Regulatory liabilities	1,176.9	1,188.9
Other	193.5	195.4
Total deferred credits and other liabilities	2,851.7	2,895.2
Total liabilities	8,183.2	7,087.0
COMMITMENTS AND CONTINGENCIES (NOTE 14)
STOCKHOLDERS' EQUITY
Common stockholders' equity	1,118.6	1,124.6
Retained earnings	2,515.6	2,544.6
Accumulated other comprehensive loss, net of tax	(28.6)	(32.1)
Total stockholders' equity	3,605.5	3,631.8
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	11,788.7	10,718.8
Treasury Stock, Carrying Basis	(0.1)	(5.3)
OG&E [Member]
CURRENT ASSETS
Cash and cash equivalents	0.0	0.0
Accounts Receivable, after Allowance for Credit Loss, Current	136.4	156.3
Accrued unbilled revenues	59.9	67.7
Materials and supplies, at average cost	121.9	116.2
Fuel clause under recoveries	91.8	0.0
Other	36.3	36.9
Total current assets	485.7	685.6
OTHER PROPERTY AND INVESTMENTS
Other	4.0	4.1
PROPERTY, PLANT AND EQUIPMENT
In service	13,414.3	13,290.6
Construction work in progress	185.6	145.5
Total property, plant and equipment	13,599.9	13,436.1
Less: accumulated depreciation	4,131.5	4,067.6
Property, Plant and Equipment, Net	9,468.4	9,368.5
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	1,269.7	415.6
Other	20.4	15.2
Total deferred charges and other assets	1,290.1	430.8
TOTAL ASSETS	11,248.2	10,489.0
CURRENT LIABILITIES
Accounts payable	229.4	236.7
Advances from parent	297.1	0.0
Customer deposits	80.7	81.1
Accrued taxes	34.9	53.3
Accrued interest	40.3	40.2
Accrued compensation	18.0	22.5
Fuel clause over recoveries	15.5	28.6
Other	34.3	33.5
Total current liabilities	750.2	495.9
LONG-TERM DEBT	3,495.0	3,494.4
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	101.3	135.4
Deferred income taxes	1,030.9	1,020.8
Deferred investment tax credits	10.9	10.9
Regulatory liabilities	1,176.9	1,188.9
Other	165.7	167.1
Total deferred credits and other liabilities	2,485.7	2,523.1
Total liabilities	6,730.9	6,513.4
STOCKHOLDERS' EQUITY
Common stockholders' equity	1,570.0	1,039.5
Retained earnings	2,947.3	2,936.1
Total stockholders' equity	4,517.3	3,975.6
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	11,248.2	10,489.0
Deferred income taxes and investment tax credits, net	0.0	272.0
Fuel inventories	$ (39.4)	$ (36.5)

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) Parenthetical - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss	$ 2.8	$ 2.6

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Millions	Total	OG&E [Member]	Common Stock	Common Stock OG&E [Member]	Premium on Common Stock	Premium on Common Stock OG&E [Member]	Retained Earnings	Retained Earnings OG&E [Member]	Accumulated Other Comprehensive Income (Loss)	Treasury Stock [Member]
Changes in Stockholders' Equity
Balance	$ 4,139.5		$ 2.0		$ 1,129.3		$ 3,036.1		$ (27.9)	$ 0.0
Common Stock, Shares, Outstanding			200,100,000	40,400,000
Treasury Stock, Common, Shares										0
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						0
Proceeds from Contributed Capital		0.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(491.8)		$ 0.0		0.0		(491.8)		0.0	$ 0.0
Other Comprehensive Income (Loss), Net of Tax, Number of Shares			0							0
Dividends, Common Stock, Cash, Number of Shares			0							0
Other comprehensive loss, net of tax	(0.9)	0.0	$ 0.0		0.0		0.0		(0.9)	$ 0.0
Dividends, Common Stock, Cash	(79.3)		$ 0.0		0.0		(79.3)		0.0	$ 0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares			0	0						(200,000)
Stock-based compensation	(5.1)	0.9	$ 0.0	$ 0.0	(14.5)	0.9	0.0	0.0	0.0	$ 9.4
Treasury Stock, Shares, Acquired			0							200,000
Treasury Stock, Value, Acquired, Cost Method	(9.7)		$ 0.0		0.0		0.0		0.0	$ 9.7
Net Income (Loss) Attributable to Parent	(491.8)	19.9		$ 0.0		0.0		19.9
Balance	3,552.7		$ 2.0		1,114.8		2,465.0		(28.8)	$ (0.3)
Common Stock, Shares, Outstanding			200,100,000	40,400,000
Treasury Stock, Common, Shares										0
Stockholders' Equity Attributable to Parent		3,979.1		$ 100.9		936.6		2,941.6
Balance	3,631.8		$ 2.0		1,122.6		2,544.6		(32.1)	$ (5.3)
Common Stock, Shares, Outstanding			200,100,000	40,400,000
Treasury Stock, Common, Shares										100,000
Stockholders' Equity Attributable to Parent	3,631.8	3,975.6		$ 100.9		938.6		2,936.1
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares			0	0						0
Proceeds From Contributed Capital, Shares				0
Proceeds from Contributed Capital	530.0	530.0		$ 0.0				0.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	52.7		$ 0.0		0.0		52.7		0.0	$ 0.0
Other Comprehensive Income (Loss), Net of Tax, Number of Shares			0							0
Dividends, Common Stock, Cash, Number of Shares			0							0
Other comprehensive loss, net of tax	3.5	0.0	$ 0.0		0.0		0.0		3.5	$ 0.0
Dividends, Common Stock, Cash	(81.7)		$ 0.0		0.0		(81.7)		0.0	$ 0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares			0	0						(100,000)
Stock-based compensation	$ (0.8)	0.5	$ 0.0	$ 0.0	(6.0)	0.5	0.0	0.0	0.0	$ 5.2
Treasury Stock, Shares, Acquired	153,964
Treasury Stock, Value, Acquired, Cost Method	$ 0.0
Net Income (Loss) Attributable to Parent	52.7	11.2		$ 0.0		0.0		11.2
Balance	3,605.5		$ 2.0		$ 1,116.6		$ 2,515.6		$ (28.6)	$ (0.1)
Common Stock, Shares, Outstanding			200,100,000	40,400,000
Treasury Stock, Common, Shares										0
Stockholders' Equity Attributable to Parent	$ 3,605.5	$ 4,517.3		$ 100.9		$ 1,469.1		$ 2,947.3

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) Parenthetical - $ / shares	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 0.4025	$ 0.3875

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Significant Accounting Policies [Text Block]

Summary of Significant Accounting Policies

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.

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


	March 31,		December 31,
(In millions)	2021		2020
REGULATORY ASSETS
Current:
Fuel clause under recoveries	$	91.8	$	—
SPP cost tracker under recovery (A)	8.4		7.0
Generation Capacity Replacement rider under recovery (A)	5.2		4.4
Other (A)	5.1		8.4
Total current regulatory assets	$	110.5	$	19.8

Non-current:
Oklahoma February 2021 extreme cold weather costs	$	829.4	$	—
Oklahoma deferred storm expenses	184.0		158.8
Benefit obligations regulatory asset	141.2		164.9
Pension tracker	39.2		18.1
Sooner Dry Scrubbers	19.5		19.7
Arkansas deferred pension expenses	11.2		9.3
Smart Grid	9.5		11.2
Unamortized loss on reacquired debt	9.5		9.7
COVID-19 impacts	7.9		6.4
Frontier Plant deferred expenses	7.4		6.4
Other	10.9		11.1
Total non-current regulatory assets	$	1,269.7	$	415.6
REGULATORY LIABILITIES
Current:
Fuel clause over recoveries	$	15.5	$	28.6
Oklahoma energy efficiency rider over recovery (B)	5.5		1.5


Other (B)	1.5		5.0
Total current regulatory liabilities	$	22.5	$	35.1
Non-current:
Income taxes refundable to customers, net	$	858.2	$	867.4
Accrued removal obligations, net	314.3		316.8

Other	4.4		4.7
Total non-current regulatory liabilities	$	1,176.9	$	1,188.9

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

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

In February 2021, OG&E's service territory experienced an unprecedented, prolonged, cold spell that resulted in record winter peak demand for electricity and extremely high natural gas and purchased power prices. 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 all deferred costs with an initial carrying charge based on the effective cost of the related debt financing. For additional information, see Note 15.

The Oklahoma deferred storm expenses regulatory asset is recovered through the Storm Cost Recovery Rider. Operation and maintenance expenses resulting from storm damage exceeding the amounts included in OG&E's base rates are deferred and typically amortized over a five-year period. 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.

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.

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

Organization

OGE Energy is a holding company with investments in energy and energy services providers offering physical delivery and related services for both electricity and natural gas primarily in the south-central 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 condensed 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.

OG&E. 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.

Enable. OGE Energy's natural gas midstream operations segment represents OGE Energy's investment in Enable. The investment in Enable is held through wholly-owned subsidiaries and ultimately OGE Holdings. Formed in 2013, Enable is primarily engaged in the business of gathering, processing, transporting and storing natural gas. Enable's natural gas gathering and processing assets are strategically located in four states and serve natural gas production in the Anadarko, Arkoma and Ark-La-Tex Basins. Enable also owns crude oil gathering assets in the Anadarko and Williston Basins. Enable has intrastate natural gas transportation and storage assets that are located in Oklahoma as well as interstate assets that extend from western Oklahoma and the Texas Panhandle to Louisiana, from Louisiana to Illinois and from Louisiana to Alabama. Enable's general partner is equally controlled by OGE Energy and CenterPoint, who each have 50 percent management ownership. Based on the 50/50 management ownership, with neither company having control, OGE Energy accounts for its interest in Enable using the

equity method of accounting. In February 2021, Enable entered into a definitive merger agreement with Energy Transfer. For further discussion, see Note 4.

Basis of Accounting [Text Block]

Basis of Presentation

The condensed financial statements included herein have been prepared by the Registrants, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations; however, the Registrants believe that the disclosures are adequate to prevent the information presented from being misleading.

In the opinion of management, all adjustments necessary to fairly present the financial position of the Registrants at March 31, 2021 and December 31, 2020, the results of the Registrants' operations for the three months ended March 31, 2021 and 2020 and the Registrants' cash flows for the three months ended March 31, 2021 and 2020 have been included and are of a normal, recurring nature except as otherwise disclosed. Management also has evaluated the impact of events occurring after March 31, 2021 up to the date of issuance of these condensed financial statements, and these statements contain all necessary adjustments and disclosures resulting from that evaluation.

Due to seasonal fluctuations and other factors, the Registrants' operating results for the three months ended March 31, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021 or for any future period. The condensed financial statements and notes thereto should be read in conjunction with the audited financial statements and notes thereto included in the Registrants' 20 20 Form 10-K.

Schedule of Regulatory Assets and Liabilities

Comprehensive Income (Loss) Note [Text Block]

Accumulated Other Comprehensive Income (Loss)

The following tables present changes in the components of accumulated other comprehensive income (loss) attributable to OGE Energy during the three months ended March 31, 2021 and 2020. All amounts below are presented net of tax.



(In millions)	Pension Plan and Restoration of Retirement Income Plan		Postretirement Benefit Plans	Other Comprehensive Gain (Loss) from Unconsolidated Affiliates				Total
Balance at December 31, 2020	$	(34.1)		$	3.3	$	(1.3)		$	(32.1)
Other comprehensive income before reclassifications	—			—		0.1			0.1
Amounts reclassified from accumulated other comprehensive income (loss)	0.6			(0.3)		—			0.3
Settlement cost	3.1			—		—			3.1

Balance at March 31, 2021	$	(30.4)		$	3.0	$	(1.2)		$	(28.6)



(In millions)	Pension Plan and Restoration of Retirement Income Plan		Postretirement Benefit Plans			Other Comprehensive Loss from Unconsolidated Affiliates	Total
Balance at December 31, 2019	$	(35.1)		$	7.8		$	(0.6)	$	(27.9)
Other comprehensive loss before reclassifications	—			—			(1.3)		(1.3)
Amounts reclassified from accumulated other comprehensive income (loss)	0.8			(0.4)			—		0.4



Balance at March 31, 2020	$	(34.3)		$	7.4		$	(1.9)	$	(28.8)

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 three months ended March 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
	Three Months Ended
	March 31,
(In millions)		2021		2020









Amortization of Pension Plan and Restoration of Retirement Income Plan items:
Actuarial losses		$	(0.8)	$	(1.1)	(A)

Settlement cost		(4.1)		—		(A)
		(4.9)		(1.1)		Income (Loss) Before Taxes
		(1.2)		(0.3)		Income Tax Expense (Benefit)
		$	(3.7)	$	(0.8)	Net Income (Loss)

Amortization of postretirement benefit plans items:
Prior service credit		$	0.4	$	0.6	(A)


		0.4		0.6		Income (Loss) Before Taxes
		0.1		0.2		Income Tax Expense (Benefit)
		$	0.3	$	0.4	Net Income (Loss)









Total reclassifications for the period, net of tax		$	(3.4)	$	(0.4)	Net Income (Loss)

(A)These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 12 for additional information).

Allowance for Credit Losses

Allowance for Uncollectible Accounts Receivable

Customer balances are generally written off if not collected within six months after the final billing date. The allowance for uncollectible accounts receivable for OG&E is generally calculated by multiplying the last six months of electric revenue by the provision rate, which is based on a 12-month historical average of actual balances written off and is adjusted for current conditions and supportable forecasts as necessary. To the extent the historical collection rates, when incorporating forecasted conditions, are not representative of future collections, there could be an effect on the amount of uncollectible expense recognized, 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 condensed balance sheets and is included in Other Operation and Maintenance Expense in the condensed statements of income.

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.

Accounting Pronouncements	3 Months Ended
Accounting Pronouncements	Mar. 31, 2021
Accounting Standards Update and Change in Accounting Principle [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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 65
-Paragraph 1
-Subparagraph (g)(2)
-URI http://asc.fasb.org/extlink&oid=113356391&loc=SL49131195-203048

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-URI http://asc.fasb.org/topic&trid=2122394

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 65
-Paragraph 1
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=113356391&loc=SL49131195-203048

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section S99
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=112272810&loc=SL108384541-122693

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 65
-Paragraph 1
-Subparagraph (i)(2)
-URI http://asc.fasb.org/extlink&oid=113356391&loc=SL49131195-203048

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(ii)
-URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(i)
-URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 65
-Paragraph 15
-Subparagraph (g)(1)
-URI http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 65
-Paragraph 1
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=113356391&loc=SL49131195-203048

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(iv)
-URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 65
-Paragraph 2
-Subparagraph (f)(1)
-URI http://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 11.M.Q2)
-URI http://asc.fasb.org/extlink&oid=112272810&loc=d3e31137-122693

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 65
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 65
-Paragraph 2
-Subparagraph (f)(3)
-URI http://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 10
-Section 65
-Paragraph 4
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (h)(2)
-URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 10
-Section 65
-Paragraph 4
-Subparagraph (e)(2)
-URI http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 65
-Paragraph 8
-Subparagraph (e)(1)

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 65
-Paragraph 8
-Subparagraph (e)(2)

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 65
-Paragraph 8
-Subparagraph (e)(3)

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers (Notes)

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Text Block]

Revenue Recognition

The following table presents OG&E's revenues from contracts with customers disaggregated by customer classification. OG&E's operating revenues disaggregated by customer classification can be found in "OG&E (Electric Utility) Results of Operations" within "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations."



	Three Months Ended March 31,
(In millions)		2021		2020
Residential		$	568.2	$	166.9
Commercial		307.5		91.3
Industrial		146.7		41.5
Oilfield		160.8		38.2
Public authorities and street light		123.1		34.7
System sales revenues		1,306.3		372.6
Provision for rate refund		—		(0.6)
Integrated market		302.1		7.2
Transmission		36.3		34.2
Other		(23.7)		7.0
Revenues from contracts with customers (A)		$	1,621.0	$	420.4

(A) In February 2021, OG&E's service territory experienced an unprecedented, prolonged, cold spell that resulted in record winter peak demand for electricity and extremely high natural gas and purchased power prices. Operating revenues significantly increased due to increased cost of sales, which are recovered from customers, as a result of the February 2021 extreme cold weather event. For further discussion, see Note 15 and "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operation."

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Equity Method Investments and Joint Ventures Disclosure [Text Block]

Investment in Unconsolidated Affiliates

3 Months Ended

Mar. 31, 2021

Investment in Unconsolidated Affiliates

OGE Energy's investment in Enable is considered to be a variable interest entity because the owners of the equity at risk in this entity have 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 is not considered the primary beneficiary of Enable since it does not have the power to direct the activities of Enable that are considered most significant to the economic performance of Enable; therefore, OGE Energy accounts for its investment in Enable using the equity method of accounting. Under the equity method, the investment will be 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's maximum exposure to loss related to Enable is limited to its equity investment in Enable at March 31, 2021 as presented in Note 13.

OGE Energy considers distributions received from Enable which do 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 condensed statements of cash flows. OGE Energy considers 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 condensed statements of cash flows.

Investment in Unconsolidated Affiliates

At March 31, 2021, OGE Energy owned 111.0 million common units, or 25.5 percent, of Enable's outstanding common units. On March 31, 2021, Enable's common unit price closed at $6.48. OGE Energy recorded equity in earnings of unconsolidated affiliates of $53.2 million for the three months ended March 31, 2021 compared to equity in losses of unconsolidated affiliates of $746.5 million for the three months ended March 31, 2020. 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 underlying equity in the net assets of Enable, as well as any impairment OGE Energy records on its investment in Enable. Equity in earnings (losses) of unconsolidated affiliates is also adjusted for the elimination of the Enogex Holdings fair value adjustments. These amortizations may also include gain or loss on dilution, net of proportional basis difference recognition. For more information concerning the formation of Enable and OGE Energy's accounting for its investment in Enable, see Note 5 within "Item 8. Financial Statements and Supplementary Data" in OGE Energy's 20 20 Form 10-K.

The following tables present summarized unaudited financial information for 100 percent of Enable as of March 31, 2021 and December 31, 2020 and for the three months ended March 31, 2021 and 2020.


	March 31,		December 31,
Balance Sheet	2021		2020
(In millions)
Current assets	$	449	$	381
Non-current assets	$	11,315	$	11,348
Current liabilities	$	1,334	$	582
Non-current liabilities	$	3,249	$	4,052


	Three Months Ended
	March 31,
Income Statement		2021		2020
(In millions)
Total revenues		$	970	$	648
Cost of natural gas and NGLs		$	519	$	226
Operating income		$	206	$	146
Net income		$	155	$	103

The following table presents a reconciliation of OGE Energy's equity in earnings (losses) of unconsolidated affiliates for the three months ended March 31, 2021 and 2020.



	Three Months Ended
	March 31,
(In millions)		2021			2020
Enable net income		$	155.0		$	103.0
OGE Energy's percent ownership at period end		25.5		%	25.5		%
OGE Energy's portion of Enable net income		$	39.5		$	26.3



Amortization of basis difference and dilution recognition (A)		13.7			7.2
Impairment of OGE Energy's equity method investment in Enable (B)		—			(780.0)
Equity in earnings (losses) of unconsolidated affiliates		$	53.2		$	(746.5)

(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 discussion can be found in OGE Energy's 2020 Form 10-K.

The following table presents a reconciliation of the difference between OGE Energy's investment in Enable and its underlying equity in the net assets of Enable (basis difference) from December 31, 2020 to March 31, 2021. The basis difference is amortized over approximately 30 years.


(In millions)
Basis difference at December 31, 2020	$	1,332.3
Amortization of basis difference	(13.7)


Basis difference at March 31, 2021	$	1,318.6

Distributions received from Enable were $18.3 million and $36.7 million during the three months ended March 31, 2021 and 2020, respectively.

On April 26, 2021, Enable announced a quarterly dividend distribution of $0.16525 per unit on its outstanding common units, which is unchanged from the previous quarter. If cash distributions to Enable's unitholders exceed $0.330625 per unit in any quarter, the general partner will receive increasing percentages, up to 50 percent, of the cash Enable distributes in excess of that amount. OGE Energy is entitled to 60 percent of those "incentive distributions." In certain circumstances, the general partner has the right to reset the minimum quarterly distribution and the target distribution levels at which the incentive distributions receive increasing percentages to higher levels based on Enable's cash distributions at the time of the exercise of this reset election.

Enable Merger Agreement with Energy Transfer

On February 16, 2021, Enable entered into a definitive merger agreement with Energy Transfer, pursuant to which, and subject to the conditions of the merger agreement, all outstanding common units of Enable will be acquired by Energy Transfer in an all-equity transaction. Under the terms of the merger agreement, Enable's common unitholders, including OGE Energy, will receive 0.8595 of one common unit representing limited partner interests in Energy Transfer for each common unit of Enable. The transaction is subject to the receipt of the required approvals from the holders of a majority of Enable's common units. Contemporaneously with the execution of the merger agreement, OGE Energy entered into a support agreement with

Enable and Energy Transfer in which OGE Energy agreed to vote its common units in favor of the merger. In April 2021, CenterPoint and OGE Energy, who collectively own approximately 72.9 percent of Enable's common units, delivered written consents approving the merger agreement, and those consents are sufficient to approve the merger. The transaction also is subject to the receipt of anti-trust approvals and other customary closing conditions. The transaction is anticipated to close in 2021. Assuming the transaction closes, OGE Energy will own approximately three percent of Energy Transfer's outstanding limited partner units in lieu of the 25.5 percent interest in Enable that it currently owns.

The merger agreement contemplates a registration rights agreement with Energy Transfer to be executed at the closing of the merger that provides for customary resale registration, demand registration and piggy-back registration rights with respect to Energy Transfer common units issued to OGE Energy in the merger. Assuming the successful completion of the merger, OGE Energy intends to exit the midstream segment in a prudent manner.

Related Party Disclosures

3 Months Ended

Mar. 31, 2021

Related Party Transactions Disclosure

Related Party Transactions

OGE Energy charges operating costs to OG&E and Enable based on several factors, and operating costs directly related to OG&E and/or Enable are assigned as such. Operating costs incurred for the benefit of OG&E are allocated either as overhead based primarily on labor costs or using the "Distrigas" method, which is a three-factor formula that uses an equal weighting of payroll, net operating revenues and gross property, plant and equipment.

OGE Energy and OG&E

OGE Energy charged operating costs to OG&E of $35.8 million and $37.9 million for the three months ended March 31, 2021 and 2020, respectively.

OGE Energy and Enable

OGE Energy and Enable are currently parties to several agreements whereby OGE Energy provides specified support services to Enable, such as certain information technology, payroll and benefits administration. Under these agreements, OGE Energy charged operating costs to Enable of $0.1 million during both the three months ended March 31, 2021 and 2020.

Pursuant to a seconding agreement, OGE Energy provides seconded employees to Enable to support Enable's operations. As of March 31, 2021, 67 employees that participate in OGE Energy's defined benefit and retirement plans are seconded to Enable. OGE Energy billed Enable for reimbursement of $5.3 million and $6.4 million during the three months ended March 31, 2021 and 2020, respectively, under the seconding agreement for employment costs. If the seconding agreement were terminated, and those employees were no longer employed by OGE Energy, and lump sum payments were made to those employees, OGE Energy would recognize a settlement or curtailment of the pension/retiree health care charges, which would increase expense at OGE Energy by $18.3 million. Settlement and curtailment charges associated with the Enable seconded employees are not reimbursable to OGE Energy by Enable. The seconding agreement can be terminated by mutual agreement of OGE Energy and Enable or solely by OGE Energy upon 120 days' notice.

OGE Energy had accounts receivable from Enable for amounts billed for support services, including the cost of seconded employees, of $3.6 million as of March 31, 2021 and $2.0 million as of December 31, 2020, which are included in Accounts Receivable in OGE Energy's condensed balance sheets.

Assuming the pending merger between Enable and Energy Transfer is completed, these agreements between OGE Energy and Enable pursuant to which OGE Energy provides support services and seconded employees will be terminated.

OG&E and Enable

Enable provides gas transportation services to OG&E pursuant to agreements that grant Enable the responsibility of delivering natural gas to OG&E's generating facilities and performing an imbalance service. With this imbalance service, in accordance with the cash-out provision of the contract, OG&E purchases gas from Enable when Enable's deliveries exceed OG&E's pipeline receipts. Enable purchases gas from OG&E when OG&E's pipeline receipts exceed Enable's deliveries. The following table presents summarized related party transactions between OG&E and Enable during the three months ended March 31, 2021 and 2020.


	Three Months Ended
	March 31,
(In millions)		2021		2020
Operating revenues:
Electricity to power electric compression assets		$	2.6	$	3.7
Cost of sales:
Natural gas transportation services		$	4.7	$	4.7

Natural gas purchases (sales)		$	(12.2)	$	0.7

Fair Value Measurements

3 Months Ended

Mar. 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).

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


	March 31,				December 31,
	2021				2020
(In millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Classification
Long-term Debt (including Long-term Debt due within one year):
OG&E Senior Notes	$	3,350.2	$	3,831.0	$	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	$	9.4	$	9.9	$	9.4	$	10.7	Level 3

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.

Share-based Payment Arrangement [Abstract]

Stock-Based Compensation

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Text Block]

Stock-Based Compensation

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


		OGE Energy					OG&E
	Three Months Ended March 31,					Three Months Ended March 31,
(In millions)		2021		2020			2021		2020
Performance units:
Total shareholder return		$	2.0	$	1.7		$	0.4	$	0.7
Earnings per share		—		0.2			—		0.1
Total performance units		2.0		1.9			0.4		0.8
Restricted stock units		0.5		0.1			—		0.1
Total compensation expense		$	2.5	$	2.0		$	0.4	$	0.9


Income tax benefit		$	0.6	$	0.5		$	0.1	$	0.2

During the three months ended March 31, 2021, OGE Energy issued 153,964 shares of its treasury stock to satisfy payouts of earned performance units and restricted stock unit grants to the Registrants' employees pursuant to OGE Energy's Stock Incentive Plan.

During the three months ended March 31, 2021, OGE Energy granted 249,909 performance units (based on total shareholder return over a three-year period) and 86,963 restricted stock units (primarily a three-year cliff vesting period) to employees at $38.06 and $31.03 fair value per share, respectively. Of those performance units and restricted stock units granted, 68,720 and 22,911 were granted to OG&E employees, respectively, at $38.14 and $30.91 fair value per share, respectively.

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	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 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 2017. 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 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.

Common Equity [Text Block]

Common Equity

3 Months Ended

Mar. 31, 2021

Common Equity

Automatic Dividend Reinvestment and Stock Purchase Plan

OGE Energy issued no shares of common stock under its Automatic Dividend Reinvestment and Stock Purchase Plan during the three months ended March 31, 2021.

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


	Three Months Ended March 31,
(In millions except per share data)		2021		2020
Net income (loss)		$	52.7	$	(491.8)
Average common shares outstanding:
Basic average common shares outstanding		200.1		200.2
Effect of dilutive securities:
Contingently issuable shares (performance and restricted stock units)		—		—
Diluted average common shares outstanding		200.1		200.2
Basic earnings (loss) per average common share		$	0.26	$	(2.46)
Diluted earnings (loss) per average common share		$	0.26	$	(2.46)
Anti-dilutive shares excluded from earnings per share calculation		—		0.3

Long-Term Debt

3 Months Ended

Mar. 31, 2021

Long-term Debt, Unclassified [Abstract]

Long-Term Debt

At March 31, 2021, the Registrants were in compliance with all of their debt agreements.

OG&E Industrial Authority Bonds

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


Series			Date Due	Amount
				(In millions)
0.23%	-	0.33%	Garfield Industrial Authority, January 1, 2025	$	47.0
0.20%	-	0.27%	Muskogee Industrial Authority, January 1, 2025	32.4
0.20%	-	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 condensed balance sheets. OG&E believes that it has sufficient liquidity to meet these obligations.

Short-Term Debt and Credit Facilities

3 Months Ended

Mar. 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 March 31, 2021, OGE Energy had $1.3 billion of short-term debt as compared to $95.0 million of short-

term debt at December 31, 2020. At March 31, 2021, OG&E had $297.1 million in advances from OGE Energy compared to $272.0 million 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 the February 2021 extreme cold weather event. The term loan contains substantially the same covenants as OGE Energy's $450.0 million revolving credit agreement, including various financial ratio covenants. The term loan will bear interest at rates equal to either a LIBOR rate specified in the term loan agreement, plus a margin of 0.75, or an alternate base rate specified in the term loan agreement, subject in each case to floor of zero percent. An alternative rate of interest will be established upon the occurrence of certain events related to the phase out of LIBOR. During the three months ended March 31, 2021, OGE Energy loaned $470.0 million of the term loan proceeds to OG&E pursuant to an intercompany note issued by OG&E to OGE Energy, contemporaneously with the closing of the term loan agreement. Advances under the intercompany note will bear interest at the same rates as are in effect under the term loan agreement. During the three months ended March 31, 2021, OGE Energy also made a capital contribution of $530.0 million to OG&E. OG&E used these proceeds to pay fuel and purchased power costs incurred during the February 2021 extreme cold weather event. OGE Energy and OG&E intend to refinance the $1.0 billion term loan by issuing long-term debt in 2021.

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


	Aggregate		Amount		Weighted-Average
Entity	Commitment		Outstanding (A)		Interest Rate			Expiration
	(In millions)
OGE Energy (B)	$	450.0	$	278.0	0.33	%	(D)	March 8, 2024	(F)
OG&E (C)(E)	450.0		0.4		1.00	%	(D)	March 8, 2024	(F)
Total	$	900.0	$	278.4	0.33	%

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

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

(E)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 March 8, 2024. At March 31, 2021, there were no intercompany borrowings under this agreement.

(F)In March 2017, the Registrants entered into unsecured five-year revolving credit agreements totaling $900.0 million ($450.0 million for OGE Energy and $450.0 million for OG&E). Each of the revolving credit facilities contained an option, which could be exercised up to two times, to extend the term of the respective facility for an additional year. In March 2018, the Registrants each utilized one of those extensions to extend the maturity of their respective credit facility from March 8, 2022 to March 8, 2023. In January 2021, the Registrants each utilized the second of those extensions to extend the maturity of their respective credit facility from March 8, 2023 to March 8, 2024. Commitments of a single existing lender with respect to $50.0 million of OGE Energy's credit facility, however, were not extended and, unless the non-extending lender is replaced in accordance with the terms of the credit facility, such commitments will expire March 8, 2023. The non-extending lender is not party to the OG&E facility.

In January 2021, the Registrants each entered into an amendment to their revolving credit facilities which gives each of the Registrants the option of extending such commitments for up to two additional one-year periods. In addition, the amendment addresses the establishment of an alternative rate of interest upon the occurrence of certain events related to the phase out of LIBOR.

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.

Retirement Plans and Postretirement Benefit Plans

3 Months Ended

Mar. 31, 2021

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

Pension and Other Postretirement Benefits Disclosure [Text Block]

Retirement Plans and Postretirement Benefit Plans

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 the three months ended March 31, 2021, the Registrants experienced an increase in both the number of employees electing to retire and the amount of lump sum payments paid to such employees upon retirement, which resulted in the Registrants recording pension plan settlement charges as presented in the Pension Plan net periodic benefit cost table below. The pension settlement charges did not require a cash outlay by the Registrants and did not increase total pension expense over time, as the charge was an acceleration of costs that otherwise would be recognized as pension expense in future periods.

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 condensed financial statements. Service cost is presented within Other Operation and Maintenance, and the remaining net periodic 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
	Three Months Ended					Three Months Ended			Three Months Ended				Three Months Ended
	March 31,					March 31,			March 31,				March 31,
(In millions)		2021		2020			2021		2020		2021		2020		2021		2020

Service cost		$	3.0	$	3.7		$	0.1	$	0.2	$	2.1	$	2.6	$	—	$	0.1
Interest cost		3.5		4.6			—		0.1		2.5		3.4		—		—
Expected return on plan assets		(8.4)		(9.4)			—		—		(6.1)		(7.1)		—		—
Amortization of net loss		2.8		3.8			0.1		0.1		2.0		2.8		—		0.1

Settlement cost		26.4		—			—		—		22.2		—		—		—
Total net periodic benefit cost		27.3		2.7			0.2		0.4		22.7		1.7		—		0.2
Less: Amount paid by unconsolidated affiliates (A)		0.1		0.5			—		—
Plus: Amount allocated from OGE Energy (A)											3.9		0.5		0.2		0.2
Net periodic benefit cost		$	27.2	$	2.2		$	0.2	$	0.4	$	26.6	$	2.2	$	0.2	$	0.4

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

In addition to the net periodic benefit cost amounts recognized, as presented in the table above, for the Pension and Restoration of Retirement Income Plans for the three months ended March 31, 2021 and 2020, the Registrants recognized the following:


	Three Months Ended March 31,
(In millions)		2021		2020
Increase (decrease) of pension expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A)		$	(20.7)	$	1.7
Deferral of pension expense related to pension settlement charges:
Oklahoma jurisdiction (A)		$	23.7	$	—
Arkansas jurisdiction (A)		$	2.2	$	—

(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
	Three Months Ended					Three Months Ended
	March 31,					March 31,
(In millions)		2021		2020			2021		2020
Service cost		$	0.1	$	0.1		$	0.1	$	—
Interest cost		0.8		1.1			0.6		0.8
Expected return on plan assets		(0.5)		(0.5)			(0.4)		(0.4)

Amortization of net loss		0.7		0.6			0.7		0.7
Amortization of unrecognized prior service cost (A)		(1.7)		(2.1)			(1.3)		(1.5)


Total net periodic benefit cost		(0.6)		(0.8)			(0.3)		(0.4)
Less: Amount paid by unconsolidated affiliates (B)		(0.1)		(0.2)
Plus: Amount allocated from OGE Energy (B)							(0.1)		(0.2)
Net periodic benefit cost		$	(0.5)	$	(0.6)		$	(0.4)	$	(0.6)

(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 addition to the net periodic benefit income amounts recognized, as presented in the table above, for the postretirement benefit plans for the three months ended March 31, 2021 and 2020, the Registrants recognized the following:


	Three Months Ended March 31,
(In millions)		2021		2020
Increase of postretirement expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A)		$	0.1	$	0.2

(A) Included in the Pension tracker, as presented in the regulatory assets and liabilities table in Note 1.


		OGE Energy					OG&E
	Three Months Ended					Three Months Ended
	March 31,					March 31,
(In millions)		2021		2020			2021		2020
Capitalized portion of net periodic pension benefit cost		$	0.8	$	1.0		$	0.7	$	0.9
Capitalized portion of net periodic postretirement benefit cost		$	0.1	$	—		$	—	$	—

Pension Plan Funding

In January 2021, OGE Energy made a $40.0 million contribution to its Pension Plan, of which $30.0 million was attributed to OG&E, and has not determined whether it will need to make any additional contributions to the Pension Plan in 2021. 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.

The entire disclosure for retirement benefits.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section S99
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=21916913&loc=d3e273930-122802

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (o)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (p)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 60
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39689-114964

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(03)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (q)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (r)(1)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iii)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (r)(2)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Report of Business Segments

Report of Business Segments

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Report of Business SegmentsOGE 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) the natural gas midstream operations segment. 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 three months ended March 31, 2021 and 2020.



Three Months Ended March 31, 2021	Electric Utility		Natural Gas Midstream Operations		Other Operations		Eliminations		Total
(In millions)
Operating revenues	$	1,630.6	$	—	$	—	$	—	$	1,630.6
Cost of sales	1,346.8		—		—		—		1,346.8
Other operation and maintenance	110.3		0.4		(1.4)		—		109.3
Depreciation and amortization	98.7		—		—		—		98.7


Taxes other than income	25.7		0.1		1.4		—		27.2
Operating income (loss)	49.1		(0.5)		—		—		48.6
Equity in earnings of unconsolidated affiliates	—		53.2		—		—		53.2
Other income (expense)	1.7		(0.5)		(0.1)		(0.2)		0.9
Interest expense	38.4		—		1.2		(0.2)		39.4
Income tax expense (benefit)	1.2		14.3		(4.9)		—		10.6
Net income	$	11.2	$	37.9	$	3.6	$	—	$	52.7
Investment in unconsolidated affiliates	$	—	$	409.2	$	23.6	$	—	$	432.8
Total assets	$	11,248.2	$	415.4	$	521.6	$	(396.5)	$	11,788.7



Three Months Ended March 31, 2020	Electric Utility		Natural Gas Midstream Operations		Other Operations		Eliminations		Total
(In millions)
Operating revenues	$	431.3	$	—	$	—	$	—	$	431.3
Cost of sales	135.0		—		—		—		135.0
Other operation and maintenance	121.0		0.6		(1.6)		—		120.0
Depreciation and amortization	94.4		—		—		—		94.4


Taxes other than income	23.9		0.1		1.6		—		25.6
Operating income (loss)	57.0		(0.7)		—		—		56.3
Equity in losses of unconsolidated affiliates (A)	—		(746.5)		—		—		(746.5)
Other income	1.8		—		1.3		(1.0)		2.1
Interest expense	36.9		—		2.4		(1.0)		38.3
Income tax expense (benefit)	2.0		(179.2)		(57.4)		—		(234.6)
Net income (loss)	$	19.9	$	(568.0)	$	56.3	$	—	$	(491.8)
Investment in unconsolidated affiliates	$	—	$	348.0	$	19.5	$	—	$	367.5
Total assets	$	10,030.7	$	353.4	$	252.9	$	(266.1)	$	10,370.9

(A) In 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Note 4.

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8981-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8657-108599

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-URI http://asc.fasb.org/topic&trid=2134510

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2021
Long-term Purchase Commitment [Line Items]
Commitments and Contingencies Disclosure [Text Block]	Commitments and Contingencies Except as set forth below, in Note 15 and under "Environmental Laws and Regulations" in Item 2 of Part I and in Item 1 of Part II of this Form 10-Q, the circumstances set forth in Notes 15 and 16 to the financial statements included in the Registrants' 20 20 Form 10-K appropriately represent, in all material respects, the current status of the Registrants' material commitments and contingent liabilities. 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. 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 condensed 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 condensed financial statements and would not have a material adverse effect on their financial position, results of operations or cash flows.

Regulated Operations	3 Months Ended
Regulated Operations	Mar. 31, 2021
Regulated Operations [Abstract]
Rate Matters and Regulation	Rate Matters and Regulation Except as set forth below, the circumstances set forth in Note 16 to the financial statements included in the Registrants' 20 20 Form 10-K appropriately represent, in all material respects, the current status of the Registrants' regulatory matters. Completed Regulatory Matters APSC Proceedings Arkansas 2020 Formula Rate Plan Filing In October 2020, OG&E filed its third evaluation report under its Formula Rate Plan, and on January 28, 2021, OG&E entered into a non-unanimous settlement agreement with the APSC General Staff and the Office of the Arkansas Attorney General. The only non-signatory to the settlement agreement agreed not to oppose the settlement. The settlement agreement included a revenue increase of $6.7 million, which is the maximum amount statutorily allowed in this filing. Additionally, the settling parties did not object to OG&E's request for a finding that the Arkansas Series II grid modernization projects included in this filing are prudent in cost. On March 9, 2021, the APSC issued a final order approving the non-unanimous settlement agreement, and new rates became effective April 1, 2021. OCC Proceedings Oklahoma Grid Enhancement Plan In November 2020, the OCC issued a final order approving a Joint Stipulation and Settlement Agreement that allows for interim recovery of OG&E's costs associated with its grid enhancement plan. The approved agreement included the following key terms: (i) cost recovery through a rider mechanism will be limited to projects placed in service in 2020 and 2021, capped at a revenue requirement of $7.0 million annually and only include communication, automation and technology systems projects; (ii) no operation and maintenance expense will be included in the rider mechanism; (iii) the rider mechanism will terminate by the issuance of a final order in OG&E's next general rate review or October 31, 2022, whichever occurs first; (iv) the rider mechanism rate of return will be capped at OG&E's current cost of capital; and (v) all cost recovery is subject to true-up and refund in OG&E's next general rate review. The rider mechanism became effective on February 1, 2021. Any capital investment falling outside the criteria of the rider mechanism will be included in OG&E's next general rate review for recovery. Pending Regulatory Matters Various proceedings pending before state or federal regulatory agencies are described below. Unless stated otherwise, the Registrants cannot predict when the regulatory agency will act or what action the regulatory agency will take. The Registrants' financial results are dependent in part on timely and adequate decisions by the regulatory agencies that set OG&E's rates. FERC Proceedings Order for Sponsored Transmission Upgrades within SPP Under the SPP Open Access Transmission Tariff, costs of participant-funded, or "sponsored," transmission upgrades may be recovered from other SPP customers whose transmission service depends on capacity enabled by the upgrade. The SPP Open Access Transmission Tariff required the SPP to charge for these upgrades beginning in 2008, but the SPP had not been charging its customers for these upgrades due to information system limitations. However, the SPP had informed participants in the market that these charges would be forthcoming. In July 2016, the FERC granted the SPP's request to recover the charges not billed since 2008. The SPP subsequently billed OG&E for these charges and credited OG&E related to transmission upgrades that OG&E had sponsored, which resulted in OG&E being a net receiver of sponsored upgrade credits. The majority of these net credits were refunded to customers through OG&E's various rate riders that include SPP activity with the remaining amounts retained by OG&E. Several companies that were net payers of Z2 charges sought rehearing of the FERC's July 2016 order; however, in November 2017, the FERC denied the rehearing requests. In January 2018, one of the impacted companies appealed the FERC's decision to the U.S. Court of Appeals for the District of Columbia Circuit. In July 2018, that court granted a motion requested by the FERC that the case be remanded back to the FERC for further examination and proceedings. In February 2019, the FERC reversed its July 2016 order and November 2017 rehearing denial, ruled that the SPP violated its tariff to charge for the 2008 - 2015 period in 2016, held that the SPP tariff provision that prohibited those charges could not be waived and ordered the SPP to develop a plan to refund the payments but not to implement the refunds until further ordered to do so. In response, in April 2019, OG&E filed a request for rehearing with the FERC, and in May 2019, OG&E filed a FERC 206 complaint against the SPP, alleging that the SPP's forced unwinding of the revenue credit payments to OG&E would violate the provisions of the Sponsored Upgrade Agreement and of the applicable tariff. OG&E's filing requested that the FERC rule that the SPP is not entitled to seek refunds or in any other way seek to unwind the revenue credit payments it had paid to OG&E pursuant to the Sponsored Upgrade Agreement. The SPP's response to OG&E's filing agreed that OG&E should be entitled to keep its Z2 payments and argued that the SPP should not be held responsible for those payments if refunds are ordered. Further, the SPP has requested the FERC to negotiate a global settlement with all impacted parties, including other project sponsors who, like OG&E, have also filed complaints at FERC contending that the payments they have received cannot properly be unwound. In February 2020, the FERC denied OG&E's request for rehearing of its February 2019 order, denying the waiver and ruling that the SPP must seek refunds from project sponsors for Z2 payments for the 2008 through 2015 period and pay them back to transmission owners. The FERC also denied the SPP's request for a stay and for institution of settlement procedures. The FERC stated it would not institute settlement procedures unless parties on both sides of the matter requested them. The FERC did not rule on OG&E's complaint or the complaints of other project sponsors, or consider the SPP's refund plan. The FERC thus has not set any date for payment of refunds. In March 2020, OG&E petitioned the U.S. Court of Appeals for the District of Columbia Circuit for review of the FERC's order denying the waiver and requiring refunds. The appeal was argued on April 14, 2021 and will likely be decided before the court's current term ends in August 2021. The Registrants cannot predict the outcome of this proceeding based on currently available information, and as of March 31, 2021 and at present time, the Registrants have not reserved an amount for a potential refund. If the reversal of the July 2016 FERC order remains intact, OG&E estimates it would be required to refund $13.0 million, which is net of amounts paid to other utilities for upgrades and would be subject to interest at the FERC-approved rate. If refunds were required, recovery of these upgrade credits would shift to future periods. Of the $13.0 million, the Registrants would be impacted by $5.0 million in expense that initially benefited the Registrants in 2016, and OG&E customers would incur a net impact of $8.0 million in expense through rider mechanisms or the FERC formula rate. In January 2020, the FERC acted on an SPP proposal to eliminate Attachment Z2 revenue crediting and replace it with a different rate mechanism that would provide project sponsors, such as OG&E, the same level of recovery, and rejected the proposal to the extent it would limit recovery to the amount of the upgrade sponsor's directly assigned upgrade costs with interest. The SPP resubmitted a proposal in April 2020 without this limited recovery, and with the alternative rate mechanism, and the FERC approved it in June 2020, effective July 1, 2020. No party sought rehearing of the order, and it is now final. This order would only prospectively impact OG&E and its recovery of any future upgrade costs that it may incur as a project sponsor. All of the existing projects that are eligible to receive revenue credits under Attachment Z2, which includes the $13.0 million at issue in OG&E's appeal as discussed above, will continue to do so. APSC Proceedings Disconnection Procedures Related to COVID-19 In September 2020, the APSC issued Order No. 9 inviting comments from all jurisdictional utilities and any other interested stakeholders on specific questions related to whether a moratorium on service terminations should be lifted and if so, how the resumption of disconnections should occur. The APSC also ordered utilities to submit a detailed "Transitional Plan" outlining how utilities propose to reinstate routine service disconnection activities and collection of past due amounts once the moratorium is lifted. OG&E submitted its proposed Transitional Plan in October 2020. The APSC General Staff thereafter filed reports for utilities that set forth recommendations as to the form of notice that should occur prior to lifting the moratorium and resuming disconnections, as well as payment arrangements that should be made available to customers. On February 8, 2021, the APSC issued Order No. 15 announcing a target date of May 3, 2021 to lift the moratorium on disconnections and requiring certain conditions and requirements that utilities must meet before disconnections may resume. Such requirements include, among other things, immediate communication to customers, notice periods for disconnections and deferred payment arrangements. On March 26, 2021, the APSC issued Order No. 18 confirming the lifting of the moratorium on disconnections on May 3, 2021 and directing utilities to take specific steps prior to resuming disconnections. February 2021 Extreme Cold Weather Event In February 2021, OG&E's service territory experienced an unprecedented, prolonged, cold spell that resulted in record winter peak demand for electricity and extremely high natural gas and purchased power prices. On April 1, 2021, OG&E filed with the APSC a Motion for Authority to Establish Special Regulatory Treatment within the Energy Cost Recovery Rider to Defer Extraordinary Fuel Costs Incurred Due to the February 2021 extreme cold weather event. More specifically, OG&E's Motion sought approval to defer, amortize and recover the extraordinary fuel costs over a ten-year period with a carrying charge of OG&E's pre-tax rate of return of 6.60 percent, through a special factor within OG&E's Energy Cost Recovery Rider beginning with the first billing cycle of May 2021. On April 13, 2021, the APSC issued Order No. 18 allowing OG&E interim recovery at an interest rate equal to the customer deposit interest rate, which is currently 0.8 percent, over a period of ten years beginning with the first billing cycle of May 2021. Recovery is subject to a true-up after the APSC determines the appropriate allocation, length of recovery and carrying charge. Such determinations are expected to be made by the APSC later this year. On May 4, 2021, OG&E filed testimony further supporting its 10-year amortization period and a carrying charge of OG&E's pre-tax rate of return of 6.60 percent. OG&E has recorded $102.4 million related to the Arkansas jurisdictional portion of the February 2021 extreme cold weather event fuel costs, which is primarily included within Fuel Clause Under Recoveries in the balance sheets as of March 31, 2021 and will be reclassified to a new regulatory asset in the subsequent period based on the APSC order received in April 2021. In April 2021, Arkansas enacted legislation to amend its storm recovery securitization statute to allow for both electric and gas utilities to recover through securitization extraordinary natural gas, fuel and purchased power costs caused by storms. The amended statute authorizes the APSC to issue a financing order for the issuance of securitization bonds upon a finding it is reasonably expected to lower overall costs or mitigate rate impacts as compared with traditional utility financing. Upon the initiation of a securitization application, the APSC has 135 days to issue an order. The requesting utility has two years from the date of the financing order to issue the securitization bonds. The amended statute allows carrying costs at a utility's weighted average cost of capital from the date of when the costs were incurred until the date when bonds are ultimately issued. OG&E is evaluating the potential securitization recovery of the Arkansas jurisdictional portion of the February 2021 extreme cold weather event costs and intends to apply for securitization if it is deemed to strike the right balance between protecting the credit strength of OG&E and providing customer savings. OCC Proceedings Oklahoma Retail Electric Supplier Certified Territory Act Causes Several rural electric cooperative electricity suppliers have filed complaints with the OCC alleging that OG&E has violated the Oklahoma Retail Electric Supplier Certified Territory Act. OG&E believes it is lawfully serving customers specifically exempted from this act and has presented evidence and testimony to the OCC supporting its position. There have been five complaint cases initiated at the OCC, and the OCC has issued decisions on each of them. The OCC ruled in favor of the electric cooperatives in three of those cases and ruled in favor of OG&E in two of those cases. All five of those cases have been appealed to the Oklahoma Supreme Court, where they have been made companion cases but will be individually briefed and have individual final decisions. If the Oklahoma Supreme Court ultimately were to find that some or all of the customers being served are not exempted from the Oklahoma Retail Electric Supplier Certified Territory Act, OG&E would have to evaluate the recoverability of some plant investments made to serve these customers. The total amount of OG&E's plant investments made to serve the customers in all five cases is approximately $28.0 million, of which $11.7 million applies to the three cases where the OCC ruled in favor of the electric cooperatives. In addition to the evaluation of the recoverability of the investments, OG&E may also be required to reimburse certified territory suppliers for an amount of lost revenue. The amount of such lost revenue would depend on how the OCC calculates the revenue requirement but could range from approximately $20.1 million to $27.8 million for all five cases, of which $1.8 million to $2.8 million would apply to the three cases where the OCC ruled in favor of the electric cooperatives. October 2020 Storm Examination In October 2020, a major ice storm moved through OG&E's service territory which caused significant damage to the system. In November 2020, the Public Utility Division of the OCC initiated an examination and review of all distribution utilities and cooperatives affected by the storm into the mitigation efforts, restoration processes and proposed improvements for future related or similar events. Respondents are required to provide certain information related to the examination, and the OCC may request additional relief as the examination proceeds. No procedural schedule has been proposed currently; however, OG&E is responding to discovery requests. February 2021 Extreme Cold Weather Event In February 2021, OG&E's service territory experienced an unprecedented, prolonged, cold spell that resulted in record winter peak demand for electricity and extremely high natural gas and purchased power prices. On February 24, 2021, OG&E submitted an application to the OCC outlining a two-step approach for regulatory treatment for the fuel and purchased power costs associated with the unprecedented weather event. The steps included: (i) an intra-year fuel clause increase to be effective April 1, 2021; and (ii) a request for regulatory asset treatment at OG&E's weighted average cost of capital for the remaining fuel and purchased power costs. On March 18, 2021, the OCC approved OG&E's filing to establish a regulatory asset. The approval allowed OG&E to create a regulatory asset for all deferred costs with an initial carrying charge based on the effective cost of the debt financing, until such time where the prudency of this event is evaluated, the amortization period is decided on and a long-term carry cost is established. As of March 31, 2020, OG&E has deferred $829.4 million to the regulatory asset, as indicated in Note 1. In April 2021, Oklahoma enacted legislation to allow for the securitization of costs incurred during the February 2021 extreme cold weather event. The new statute authorizes the OCC to issue a financing order for the issuance of securitization bonds after consideration of certain factors, including but not limited to, mitigated impacts and savings for customers through the use of ratepayer-backed securitization bonds as compared to traditional utility financing. The OCC must issue a financing order within 180 days after receiving all necessary information required by the statute. Under the statute, the Oklahoma Development Finance Authority is responsible for issuing the securitization bonds within two years from the date of the financing order. Carrying costs will be included at a rate and time determined by the OCC and continue until the bonds are issued. On April 26, 2021, OG&E filed an application pursuant to the Act seeking OCC approval to securitize its costs related to the February 2021 extreme cold weather event and to receive an interim carrying charge. OG&E expects to provide the requisite information to support the application by the end of the second quarter of 2021.

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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 both electricity and natural gas primarily in the south-central 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 condensed 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. OG&E. 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. Enable. OGE Energy's natural gas midstream operations segment represents OGE Energy's investment in Enable. The investment in Enable is held through wholly-owned subsidiaries and ultimately OGE Holdings. Formed in 2013, Enable is primarily engaged in the business of gathering, processing, transporting and storing natural gas. Enable's natural gas gathering and processing assets are strategically located in four states and serve natural gas production in the Anadarko, Arkoma and Ark-La-Tex Basins. Enable also owns crude oil gathering assets in the Anadarko and Williston Basins. Enable has intrastate natural gas transportation and storage assets that are located in Oklahoma as well as interstate assets that extend from western Oklahoma and the Texas Panhandle to Louisiana, from Louisiana to Illinois and from Louisiana to Alabama.
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The condensed financial statements included herein have been prepared by the Registrants, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations; however, the Registrants believe that the disclosures are adequate to prevent the information presented from being misleading. In the opinion of management, all adjustments necessary to fairly present the financial position of the Registrants at March 31, 2021 and December 31, 2020, the results of the Registrants' operations for the three months ended March 31, 2021 and 2020 and the Registrants' cash flows for the three months ended March 31, 2021 and 2020 have been included and are of a normal, recurring nature except as otherwise disclosed. Management also has evaluated the impact of events occurring after March 31, 2021 up to the date of issuance of these condensed financial statements, and these statements contain all necessary adjustments and disclosures resulting from that evaluation. Due to seasonal fluctuations and other factors, the Registrants' operating results for the three months ended March 31, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021 or for any future period. The condensed financial statements and notes thereto should be read in conjunction with the audited financial statements and notes thereto included in the Registrants' 20 20 Form 10-K.
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.
Equity Method Investments [Policy Text Block]	OGE Energy's natural gas midstream operations segment represents OGE Energy's investment in Enable. The investment in Enable is held through wholly-owned subsidiaries and ultimately OGE Holdings. Formed in 2013, Enable is primarily engaged in the business of gathering, processing, transporting and storing natural gas. Enable's natural gas gathering and processing assets are strategically located in four states and serve natural gas production in the Anadarko, Arkoma and Ark-La-Tex Basins. Enable also owns crude oil gathering assets in the Anadarko and Williston Basins. Enable has intrastate natural gas transportation and storage assets that are located in Oklahoma as well as interstate assets that extend from western Oklahoma and the Texas Panhandle to Louisiana, from Louisiana to Illinois and from Louisiana to Alabama. Investment in Unconsolidated Affiliates OGE Energy's investment in Enable is considered to be a variable interest entity because the owners of the equity at risk in this entity have 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 is not considered the primary beneficiary of Enable since it does not have the power to direct the activities of Enable that are considered most significant to the economic performance of Enable; therefore, OGE Energy accounts for its investment in Enable using the equity method of accounting. Under the equity method, the investment will be 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's maximum exposure to loss related to Enable is limited to its equity investment in Enable at March 31, 2021 as presented in Note 13. OGE Energy considers distributions received from Enable which do 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 condensed statements of cash flows. OGE Energy considers 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 condensed statements of cash flows.
Fair Value of Financial Instruments, Policy [Policy Text Block]	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). The Registrants had no financial instruments measured at fair value on a recurring basis at March 31, 2021 and December 31, 2020. The following table presents the carrying amount and fair value of
Income Tax, Policy [Policy Text Block]	OGE Energy files consolidated income tax returns in the U.S. federal jurisdiction and various state jurisdictions.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.
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.
Financing Receivable, Allowance for Credit Losses, Policy for Uncollectible Amounts	Allowance for Uncollectible Accounts Receivable Customer balances are generally written off if not collected within six months after the final billing date. The allowance for uncollectible accounts receivable for OG&E is generally calculated by multiplying the last six months of electric revenue by the provision rate, which is based on a 12-month historical average of actual balances written off and is adjusted for current conditions and supportable forecasts as necessary. To the extent the historical collection rates, when incorporating forecasted conditions, are not representative of future collections, there could be an effect on the amount of uncollectible expense recognized, 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 condensed balance sheets and is included in Other Operation and Maintenance Expense in the condensed statements of income. 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.

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=120406818&loc=d3e32247-109318

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32847-109319

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 740
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6491622&loc=d3e9504-115650

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=116657188&loc=SL116659661-227067

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=120406818&loc=d3e32280-109318

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 17
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32809-109319

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Fair Value Measures and Disclosures (Policies)	3 Months Ended
Fair Value Measures and Disclosures (Policies)	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments, Policy [Policy Text Block]	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). The Registrants had no financial instruments measured at fair value on a recurring basis at March 31, 2021 and December 31, 2020. The following table presents the carrying amount and fair value of

Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2021

Schedule of Regulatory Assets and Liabilities [Table Text Block]

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


	March 31,		December 31,
(In millions)	2021		2020
REGULATORY ASSETS
Current:
Fuel clause under recoveries	$	91.8	$	—
SPP cost tracker under recovery (A)	8.4		7.0
Generation Capacity Replacement rider under recovery (A)	5.2		4.4
Other (A)	5.1		8.4
Total current regulatory assets	$	110.5	$	19.8

Non-current:
Oklahoma February 2021 extreme cold weather costs	$	829.4	$	—
Oklahoma deferred storm expenses	184.0		158.8
Benefit obligations regulatory asset	141.2		164.9
Pension tracker	39.2		18.1
Sooner Dry Scrubbers	19.5		19.7
Arkansas deferred pension expenses	11.2		9.3
Smart Grid	9.5		11.2
Unamortized loss on reacquired debt	9.5		9.7
COVID-19 impacts	7.9		6.4
Frontier Plant deferred expenses	7.4		6.4
Other	10.9		11.1
Total non-current regulatory assets	$	1,269.7	$	415.6
REGULATORY LIABILITIES
Current:
Fuel clause over recoveries	$	15.5	$	28.6
Oklahoma energy efficiency rider over recovery (B)	5.5		1.5


Other (B)	1.5		5.0
Total current regulatory liabilities	$	22.5	$	35.1
Non-current:
Income taxes refundable to customers, net	$	858.2	$	867.4
Accrued removal obligations, net	314.3		316.8

Other	4.4		4.7
Total non-current regulatory liabilities	$	1,176.9	$	1,188.9

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

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

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



(In millions)	Pension Plan and Restoration of Retirement Income Plan		Postretirement Benefit Plans	Other Comprehensive Gain (Loss) from Unconsolidated Affiliates				Total
Balance at December 31, 2020	$	(34.1)		$	3.3	$	(1.3)		$	(32.1)
Other comprehensive income before reclassifications	—			—		0.1			0.1
Amounts reclassified from accumulated other comprehensive income (loss)	0.6			(0.3)		—			0.3
Settlement cost	3.1			—		—			3.1

Balance at March 31, 2021	$	(30.4)		$	3.0	$	(1.2)		$	(28.6)



(In millions)	Pension Plan and Restoration of Retirement Income Plan		Postretirement Benefit Plans			Other Comprehensive Loss from Unconsolidated Affiliates	Total
Balance at December 31, 2019	$	(35.1)		$	7.8		$	(0.6)	$	(27.9)
Other comprehensive loss before reclassifications	—			—			(1.3)		(1.3)
Amounts reclassified from accumulated other comprehensive income (loss)	0.8			(0.4)			—		0.4



Balance at March 31, 2020	$	(34.3)		$	7.4		$	(1.9)	$	(28.8)

Schedule of Amounts Reclassified out of Accumulated Other Comprehensive Income [Table Text Block]


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
	Three Months Ended
	March 31,
(In millions)		2021		2020









Amortization of Pension Plan and Restoration of Retirement Income Plan items:
Actuarial losses		$	(0.8)	$	(1.1)	(A)

Settlement cost		(4.1)		—		(A)
		(4.9)		(1.1)		Income (Loss) Before Taxes
		(1.2)		(0.3)		Income Tax Expense (Benefit)
		$	(3.7)	$	(0.8)	Net Income (Loss)

Amortization of postretirement benefit plans items:
Prior service credit		$	0.4	$	0.6	(A)


		0.4		0.6		Income (Loss) Before Taxes
		0.1		0.2		Income Tax Expense (Benefit)
		$	0.3	$	0.4	Net Income (Loss)









Total reclassifications for the period, net of tax		$	(3.4)	$	(0.4)	Net Income (Loss)

(A)These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 12 for additional information).

Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2021

Disaggregation of Revenue [Table Text Block]



	Three Months Ended March 31,
(In millions)		2021		2020
Residential		$	568.2	$	166.9
Commercial		307.5		91.3
Industrial		146.7		41.5
Oilfield		160.8		38.2
Public authorities and street light		123.1		34.7
System sales revenues		1,306.3		372.6
Provision for rate refund		—		(0.6)
Integrated market		302.1		7.2
Transmission		36.3		34.2
Other		(23.7)		7.0
Revenues from contracts with customers (A)		$	1,621.0	$	420.4

Investment in Unconsolidated Affiliates (Tables)

3 Months Ended

Mar. 31, 2021

Reconciliation of Basis Difference [Line Items]

Reconciliation of Basis Difference [Table Text Block]


(In millions)
Basis difference at December 31, 2020	$	1,332.3
Amortization of basis difference	(13.7)


Basis difference at March 31, 2021	$	1,318.6

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 three months ended March 31, 2021 and 2020.



	Three Months Ended
	March 31,
(In millions)		2021			2020
Enable net income		$	155.0		$	103.0
OGE Energy's percent ownership at period end		25.5		%	25.5		%
OGE Energy's portion of Enable net income		$	39.5		$	26.3



Amortization of basis difference and dilution recognition (A)		13.7			7.2
Impairment of OGE Energy's equity method investment in Enable (B)		—			(780.0)
Equity in earnings (losses) of unconsolidated affiliates		$	53.2		$	(746.5)

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

The following table presents summarized related party transactions between OG&E and Enable during the three months ended March 31, 2021 and 2020.


	Three Months Ended
	March 31,
(In millions)		2021		2020
Operating revenues:
Electricity to power electric compression assets		$	2.6	$	3.7
Cost of sales:
Natural gas transportation services		$	4.7	$	4.7

Natural gas purchases (sales)		$	(12.2)	$	0.7

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

ummarized unaudited financial information for 100 percent of Enable as of March 31, 2021 and December 31, 2020 and for the three months ended March 31, 2021 and 2020.


	March 31,		December 31,
Balance Sheet	2021		2020
(In millions)
Current assets	$	449	$	381
Non-current assets	$	11,315	$	11,348
Current liabilities	$	1,334	$	582
Non-current liabilities	$	3,249	$	4,052

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


	Three Months Ended
	March 31,
Income Statement		2021		2020
(In millions)
Total revenues		$	970	$	648
Cost of natural gas and NGLs		$	519	$	226
Operating income		$	206	$	146
Net income		$	155	$	103

Related Party Disclosures (Tables)

3 Months Ended

Mar. 31, 2021

The following table presents summarized related party transactions between OG&E and Enable during the three months ended March 31, 2021 and 2020.


	Three Months Ended
	March 31,
(In millions)		2021		2020
Operating revenues:
Electricity to power electric compression assets		$	2.6	$	3.7
Cost of sales:
Natural gas transportation services		$	4.7	$	4.7

Natural gas purchases (sales)		$	(12.2)	$	0.7

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Fair Value and Carrying Amount of PRM Financial Instruments [Table Text Block]

The following table presents the carrying amount and fair value of the Registrants' financial instruments at March 31, 2021 and December 31, 2020, as well as the classification level within the fair value hierarchy.


	March 31,				December 31,
	2021				2020
(In millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Classification
Long-term Debt (including Long-term Debt due within one year):
OG&E Senior Notes	$	3,350.2	$	3,831.0	$	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	$	9.4	$	9.9	$	9.4	$	10.7	Level 3

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

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

Share-based Payment Arrangement, Cost by Plan [Table Text Block]


		OGE Energy					OG&E
	Three Months Ended March 31,					Three Months Ended March 31,
(In millions)		2021		2020			2021		2020
Performance units:
Total shareholder return		$	2.0	$	1.7		$	0.4	$	0.7
Earnings per share		—		0.2			—		0.1
Total performance units		2.0		1.9			0.4		0.8
Restricted stock units		0.5		0.1			—		0.1
Total compensation expense		$	2.5	$	2.0		$	0.4	$	0.9


Income tax benefit		$	0.6	$	0.5		$	0.1	$	0.2

Common Equity (Tables)

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

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

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


	Three Months Ended March 31,
(In millions except per share data)		2021		2020
Net income (loss)		$	52.7	$	(491.8)
Average common shares outstanding:
Basic average common shares outstanding		200.1		200.2
Effect of dilutive securities:
Contingently issuable shares (performance and restricted stock units)		—		—
Diluted average common shares outstanding		200.1		200.2
Basic earnings (loss) per average common share		$	0.26	$	(2.46)
Diluted earnings (loss) per average common share		$	0.26	$	(2.46)
Anti-dilutive shares excluded from earnings per share calculation		—		0.3

Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2021

Long-term Debt, Unclassified [Abstract]

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


Series			Date Due	Amount
				(In millions)
0.23%	-	0.33%	Garfield Industrial Authority, January 1, 2025	$	47.0
0.20%	-	0.27%	Muskogee Industrial Authority, January 1, 2025	32.4
0.20%	-	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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

Schedule of Line of Credit Facilities [Table Text Block]

Short-Term Debt and Credit Facilities (Tables)

3 Months Ended

Mar. 31, 2021

Short-term Debt [Abstract]

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


	Aggregate		Amount		Weighted-Average
Entity	Commitment		Outstanding (A)		Interest Rate			Expiration
	(In millions)
OGE Energy (B)	$	450.0	$	278.0	0.33	%	(D)	March 8, 2024	(F)
OG&E (C)(E)	450.0		0.4		1.00	%	(D)	March 8, 2024	(F)
Total	$	900.0	$	278.4	0.33	%

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

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

Retirement Plans and Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2021

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

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
	Three Months Ended					Three Months Ended			Three Months Ended				Three Months Ended
	March 31,					March 31,			March 31,				March 31,
(In millions)		2021		2020			2021		2020		2021		2020		2021		2020

Service cost		$	3.0	$	3.7		$	0.1	$	0.2	$	2.1	$	2.6	$	—	$	0.1
Interest cost		3.5		4.6			—		0.1		2.5		3.4		—		—
Expected return on plan assets		(8.4)		(9.4)			—		—		(6.1)		(7.1)		—		—
Amortization of net loss		2.8		3.8			0.1		0.1		2.0		2.8		—		0.1

Settlement cost		26.4		—			—		—		22.2		—		—		—
Total net periodic benefit cost		27.3		2.7			0.2		0.4		22.7		1.7		—		0.2
Less: Amount paid by unconsolidated affiliates (A)		0.1		0.5			—		—
Plus: Amount allocated from OGE Energy (A)											3.9		0.5		0.2		0.2
Net periodic benefit cost		$	27.2	$	2.2		$	0.2	$	0.4	$	26.6	$	2.2	$	0.2	$	0.4

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


	Three Months Ended March 31,
(In millions)		2021		2020
Increase (decrease) of pension expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A)		$	(20.7)	$	1.7
Deferral of pension expense related to pension settlement charges:
Oklahoma jurisdiction (A)		$	23.7	$	—
Arkansas jurisdiction (A)		$	2.2	$	—

(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
	Three Months Ended					Three Months Ended
	March 31,					March 31,
(In millions)		2021		2020			2021		2020
Service cost		$	0.1	$	0.1		$	0.1	$	—
Interest cost		0.8		1.1			0.6		0.8
Expected return on plan assets		(0.5)		(0.5)			(0.4)		(0.4)

Amortization of net loss		0.7		0.6			0.7		0.7
Amortization of unrecognized prior service cost (A)		(1.7)		(2.1)			(1.3)		(1.5)


Total net periodic benefit cost		(0.6)		(0.8)			(0.3)		(0.4)
Less: Amount paid by unconsolidated affiliates (B)		(0.1)		(0.2)
Plus: Amount allocated from OGE Energy (B)							(0.1)		(0.2)
Net periodic benefit cost		$	(0.5)	$	(0.6)		$	(0.4)	$	(0.6)

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


	Three Months Ended March 31,
(In millions)		2021		2020
Increase of postretirement expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A)		$	0.1	$	0.2

(A) Included in the Pension tracker, as presented in the regulatory assets and liabilities table in Note 1.

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


		OGE Energy					OG&E
	Three Months Ended					Three Months Ended
	March 31,					March 31,
(In millions)		2021		2020			2021		2020
Capitalized portion of net periodic pension benefit cost		$	0.8	$	1.0		$	0.7	$	0.9
Capitalized portion of net periodic postretirement benefit cost		$	0.1	$	—		$	—	$	—

Report of Business Segments (Tables)

3 Months Ended

Mar. 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 three months ended March 31, 2021 and 2020.



Three Months Ended March 31, 2021	Electric Utility		Natural Gas Midstream Operations		Other Operations		Eliminations		Total
(In millions)
Operating revenues	$	1,630.6	$	—	$	—	$	—	$	1,630.6
Cost of sales	1,346.8		—		—		—		1,346.8
Other operation and maintenance	110.3		0.4		(1.4)		—		109.3
Depreciation and amortization	98.7		—		—		—		98.7


Taxes other than income	25.7		0.1		1.4		—		27.2
Operating income (loss)	49.1		(0.5)		—		—		48.6
Equity in earnings of unconsolidated affiliates	—		53.2		—		—		53.2
Other income (expense)	1.7		(0.5)		(0.1)		(0.2)		0.9
Interest expense	38.4		—		1.2		(0.2)		39.4
Income tax expense (benefit)	1.2		14.3		(4.9)		—		10.6
Net income	$	11.2	$	37.9	$	3.6	$	—	$	52.7
Investment in unconsolidated affiliates	$	—	$	409.2	$	23.6	$	—	$	432.8
Total assets	$	11,248.2	$	415.4	$	521.6	$	(396.5)	$	11,788.7



Three Months Ended March 31, 2020	Electric Utility		Natural Gas Midstream Operations		Other Operations		Eliminations		Total
(In millions)
Operating revenues	$	431.3	$	—	$	—	$	—	$	431.3
Cost of sales	135.0		—		—		—		135.0
Other operation and maintenance	121.0		0.6		(1.6)		—		120.0
Depreciation and amortization	94.4		—		—		—		94.4


Taxes other than income	23.9		0.1		1.6		—		25.6
Operating income (loss)	57.0		(0.7)		—		—		56.3
Equity in losses of unconsolidated affiliates (A)	—		(746.5)		—		—		(746.5)
Other income	1.8		—		1.3		(1.0)		2.1
Interest expense	36.9		—		2.4		(1.0)		38.3
Income tax expense (benefit)	2.0		(179.2)		(57.4)		—		(234.6)
Net income (loss)	$	19.9	$	(568.0)	$	56.3	$	—	$	(491.8)
Investment in unconsolidated affiliates	$	—	$	348.0	$	19.5	$	—	$	367.5
Total assets	$	10,030.7	$	353.4	$	252.9	$	(266.1)	$	10,370.9

(A) In 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Note 4

Summary of Significant Accounting Policies Equity Ownership (Details)	Mar. 31, 2021
CenterPoint [Member]
Percentage Share of Management Rights	50.00%
OGE Energy [Member]
Percentage Share of Management Rights	50.00%

Regulated Operations (Details) - USD ($)
$ in Millions

Mar. 31, 2021

Dec. 31, 2020

Schedule of Regulatory Assets and Liabilities [Line Items]

Fuel clause under recoveries

$ 91.8

$ 0.0

110.5

19.8

Current Regulatory Liabilities

1,269.7

415.6

22.5

35.1

Fuel clause over recoveries

15.5

28.6

Oklahoma Demand Program Over Recovery [Member]

1,176.9

1,188.9

Schedule of Regulatory Assets and Liabilities [Line Items]

Current Regulatory Liabilities

^[1]

5.5

1.5

Other (B)

Schedule of Regulatory Assets and Liabilities [Line Items]

Current Regulatory Liabilities

^[1]

1.5

5.0

Income taxes recoverable from customers, net

4.4

4.7

Schedule of Regulatory Assets and Liabilities [Line Items]

Accrued removal obligations, net

858.2

867.4

Schedule of Regulatory Assets and Liabilities [Line Items]

Production Tax Credit Rider [Member]

314.3

316.8

Schedule of Regulatory Assets and Liabilities [Line Items]

Benefit obligations regulatory asset

^[2]

5.2

4.4

Schedule of Regulatory Assets and Liabilities [Line Items]

Oklahoma deferred storm expenses

141.2

164.9

Schedule of Regulatory Assets and Liabilities [Line Items]

Schedule of Regulatory Assets and Liabilities [Line Items]

184.0

158.8

Smart Grid

Dry Scrubber Regulatory Asset [Member]

9.5

11.2

Schedule of Regulatory Assets and Liabilities [Line Items]

Unamortized loss on reacquired debt

19.5

19.7

Schedule of Regulatory Assets and Liabilities [Line Items]

Deferred Pension Expenses [Member]

9.5

9.7

Schedule of Regulatory Assets and Liabilities [Line Items]

Other Regulatory Asset [Member]

11.2

9.3

Schedule of Regulatory Assets and Liabilities [Line Items]

^[2]

5.1

8.4

Schedule of Regulatory Assets and Liabilities [Line Items]

10.9

11.1

Pension tracker

SPP Cost Tracker Rider Under Recovery

39.2

18.1

Schedule of Regulatory Assets and Liabilities [Line Items]

COVID-19 Deferred Expenses

^[2]

8.4

7.0

Schedule of Regulatory Assets and Liabilities [Line Items]

Extreme Cold Weather Costs

7.9

6.4

Schedule of Regulatory Assets and Liabilities [Line Items]

Fuel clause under recoveries

102.4

Schedule of Regulatory Assets and Liabilities [Line Items]

829.4

0.0

Frontier Plant

Accumulated Other Comprehensive Income (Loss) [Line Items]

$ 7.4

$ 6.4

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

Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (28.6)	$ (28.8)	$ (32.1)	$ (27.9)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0.1	(1.3)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.3	0.4
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] \| Pension Plan [Member]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(30.4)	(34.3)	(34.1)	(35.1)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0.0	0.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.6	0.8
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] \| Other Postretirement Benefits Plan [Member]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	3.0	7.4	3.3	7.8
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0.0	0.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(0.3)	(0.4)
Commodity Contract [Member]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0.1	(1.3)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(1.2)	(1.9)	$ (1.3)	$ (0.6)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.0	$ 0.0
Settlement Cost [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	3.1
Settlement Cost [Member] \| Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] \| Pension Plan [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	3.1
Settlement Cost [Member] \| Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] \| Other Postretirement Benefits Plan [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.0
Settlement Cost [Member] \| Commodity Contract [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 0.0

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

3 Months Ended

Mar. 31, 2021

Mar. 31, 2020

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

$ (3.4)

$ (0.4)

Pension Plan [Member]

Accumulated Other Comprehensive Income (Loss) [Line Items]

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

^[1]

(0.8)

(1.1)

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

^[1]

(4.1)

0.0

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

(4.9)

(1.1)

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

(1.2)

(0.3)

Amounts reclassified from accumulated other comprehensive income (loss), net of tax

(3.7)

(0.8)

Other Postretirement Benefits Plan [Member]

Accumulated Other Comprehensive Income (Loss) [Line Items]

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

^[1]

0.4

0.6

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

0.4

0.6

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

0.1

0.2

Amounts reclassified from accumulated other comprehensive income (loss), net of tax

$ 0.3

$ 0.4

[1]	These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 12 for additional information).

Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions

3 Months Ended

Mar. 31, 2021

Mar. 31, 2020

^[1]

$ 1,621.0

$ 420.4

Residential

568.2

166.9

Commercial

307.5

91.3

Industrial

146.7

41.5

Oilfield

Public authorities and street light

160.8

38.2

123.1

34.7

System sales revenues

Provision for rate refund

1,306.3

372.6

0.0

(0.6)

Integrated market

302.1

7.2

Transmission

36.3

34.2

Other

Expected Settlement Charge

$ (23.7)

$ 7.0

[1]

Investment in Unconsolidated Affiliates (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions

3 Months Ended

Mar. 31, 2021

Mar. 31, 2020

Dec. 31, 2020

$ 18.3

Limited Partner Units Owned

111.0

Distribution Made to Limited Partner, Distributions Declared, Per Unit

$ 0.16525

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

25.50%

Equity in earnings (losses) of unconsolidated affiliates

$ 53.2

$ (746.5)

^[1]

Equity Method Investment, Difference Between Carrying Amount and Underlying Equity

1,318.6

$ 1,332.3

Enable Midstream Partners [Member]

Distributions from unconsolidated affiliates

$ 18.3

$ 36.7

OGE Holdings [Member]

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

25.50%

Energy Transfer

Common Stock, Terms of Conversion

0.8595

Enable Midstream Partners [Member]

Share Price

$ 6.48

[1]	In 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Note 4

Investment in Unconsolidated Affiliates Summarized Balance Sheet Information of Equity Method Investment (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Assets, Current	$ 502.7	$ 428.5
Liabilities, Current	1,836.5	697.4
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Assets, Current	449.0	381.0
Assets, Noncurrent	11,315.0	11,348.0
Liabilities, Current	1,334.0	582.0
Liabilities, Noncurrent	$ 3,249.0	$ 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.

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 after one year or beyond the normal operating cycle, if longer.

Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

Amount of obligation due after one year or beyond the normal operating cycle, if longer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 201.5-02(25))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(23))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 201.5-02(26))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5710-111685

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 201.5-02(24))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5710-111685

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988

Investment in Unconsolidated Affiliates Summarized Income Statement of Equity Method Investment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 1,630.6	$ 431.3
Operating Income (Loss)	48.6	56.3
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	52.7	(491.8)
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Operating revenues	970.0	648.0
Cost of Revenue	519.0	226.0
Operating Income (Loss)	206.0	146.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 155.0	$ 103.0

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669619-108580

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 235
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(b)(2))
-URI http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669625-108580

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684

Reference 14: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4J
-URI http://asc.fasb.org/extlink&oid=120409616&loc=SL4591551-111686

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3000-108585

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 20: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4K
-URI http://asc.fasb.org/extlink&oid=120409616&loc=SL4591552-111686

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22658-107794

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).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 235
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(b)(2))
-URI http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items]

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

3 Months Ended

Mar. 31, 2021

Mar. 31, 2020

Dec. 31, 2020

Equity Method Investment, Difference Between Carrying Amount and Underlying Equity

$ 1,318.6

$ 1,332.3

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

25.50%

Proportionate Unconsolidated Affiliate Net Income

$ 39.5

$ 26.3

Equity in Earnings Amortization of Basis Difference

^[1]

13.7

7.2

Income (Loss) from Equity Method Investments, Total

53.2

(746.5)

^[2]

Asset Impairment Charges

^[3]

0.0

(780.0)

Net Income (Loss), Including Portion Attributable to Noncontrolling Interest

52.7

(491.8)

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

Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items]

Net Income (Loss), Including Portion Attributable to Noncontrolling Interest

$ 155.0

$ 103.0

OGE Holdings [Member]

Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items]

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

25.50%

OGE Energy [Member]

Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Line Items]

Equity in Earnings Amortization of Basis Difference

$ 13.7

[1]	Includes loss on dilution, net of proportional basis difference recognition.
[2]	In 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Note 4
[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 discussion can be found in OGE Energy's 2020 Form 10-K.

Related Party Transactions (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 0.16525
Expected Settlement Charge	$ 18.3
Enable Midstream Partners [Member] \| OG&E [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	2.6	$ 3.7
OG&E [Member] \| OGE Energy [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	35.8	37.9
Operating Costs Charged [Member] \| Enable Midstream Partners [Member] \| OGE Energy [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	0.1	0.1
Employment Costs [Member] \| Enable Midstream Partners [Member] \| OGE Energy [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	5.3	6.4
Natural Gas Transportation [Member] \| Enable Midstream Partners [Member] \| OG&E [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	4.7	4.7
Natural Gas Purchases [Member] \| Enable Midstream Partners [Member] \| OG&E [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	(12.2)	$ 0.7
Excluding Fuel Purchases [Member]
Related Party Transaction [Line Items]
Accounts receivable - unconsolidated affiliates	$ 3.6		$ 2.0

Fair Value Measurements Carrying and Fair Value Amounts (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
OG&E Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-Term Debt, Carrying Amount	$ 3,350.2	$ 3,349.6
Long-Term Debt, Fair Value	3,831.0	4,182.1
OG&E Industrial Authority Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-Term Debt, Carrying Amount	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]
Long-Term Debt, Carrying Amount	9.4	9.4
Long-Term Debt, Fair Value	9.9	10.7
Fair Value, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 0.0	$ 0.0

Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stock-Based Compensation Activity
Income tax benefit	$ 0.6	$ 0.5
Treasury Stock, Shares, Acquired	153,964
OG&E [Member]
Stock-Based Compensation Activity
Income tax benefit	$ 0.1	0.2
Performance Shares [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	249,909
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 38.06
Stock-Based Compensation Activity
Compensation expense	$ 2.0	1.9
Performance Shares [Member] \| OG&E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	68,720
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 38.14
Stock-Based Compensation Activity
Compensation expense	$ 0.4	0.8
Restricted stock units
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	86,963
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 31.03
Stock-Based Compensation Activity
Compensation expense	$ 0.5	0.1
Restricted stock units \| OG&E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	22,911
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 30.91
Stock-Based Compensation Activity
Compensation expense	$ 0.0	0.1
Share-based Payment Arrangement [Member]
Stock-Based Compensation Activity
Compensation expense	2.5	2.0
Share-based Payment Arrangement [Member] \| OG&E [Member]
Stock-Based Compensation Activity
Compensation expense	0.4	0.9
Total Shareholder Return [Member] \| Performance Shares [Member]
Stock-Based Compensation Activity
Compensation expense	2.0	1.7
Total Shareholder Return [Member] \| Performance Shares [Member] \| OG&E [Member]
Stock-Based Compensation Activity
Compensation expense	0.4	0.7
Performance Units Related to Earnings Per Share [Member] \| Performance Shares [Member]
Stock-Based Compensation Activity
Compensation expense	0.0	0.2
Performance Units Related to Earnings Per Share [Member] \| Performance Shares [Member] \| OG&E [Member]
Stock-Based Compensation Activity
Compensation expense	$ 0.0	$ 0.1

Income Taxes (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Non-Current Regulatory Liabilities	$ 1,176.9	$ 1,188.9

Common Equity Automatic Dividend Reinvestment and Stock Purchase Plan (Details)	3 Months Ended
	Mar. 31, 2021 shares
Automatic Dividend Reinvestment and Stock Purchase Plan [Member]
Stock Issued During Period, Shares, New Issues	0

Common Equity Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Equity [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 52.7	$ (491.8)
Basic average common shares outstanding	200.1	200.2
Contingently issuable shares (performance and restricted stock units)	0.0	0.0
Diluted average common shares outstanding	200.1	200.2
Earnings Per Share, Basic and Diluted [Abstract]
Basic earnings (loss) per average common share	$ 0.26	$ (2.46)
Diluted earnings (loss) per average common share	$ 0.26	$ (2.46)
Anti-dilutive shares excluded from earnings per share calculation	0.0	0.3

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1448-109256

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22595-107794

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1337-109256

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=120380238&loc=d3e4984-109258

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(23))
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=120380238&loc=d3e3842-109258

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22644-107794

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(25))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1252-109256

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60B
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121326447&loc=SL5780133-109256

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(27))
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=120380238&loc=d3e4984-109258

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22644-107794

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=120380238&loc=d3e3842-109258

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1252-109256

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22595-107794

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60B
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121326447&loc=SL5780133-109256

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(27))
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(23))
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1337-109256

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(25))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 54
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e2603-109256

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 44
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e2062-109256

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1828-109256

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e2600-109256

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e2597-109256

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 48
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e2538-109256

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 48
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e2538-109256

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 23
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1757-109256

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 51
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e2574-109256

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

Long-Term Debt (Details) $ in Millions	3 Months Ended
Long-Term Debt (Details) $ in Millions	Mar. 31, 2021 USD ($)
Debt Instrument [Line Items]
Percent of Principal Amount Subject to Optional Tender	100.00%
Debt Instrument, Face Amount	$ 1,000.0
Garfield Industrial Authority Bond [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Jan. 01, 2025
Muskogee Industrial Authority Bond Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Jan. 01, 2025
Muskogee Industrial Authority Bond Due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Jun. 01, 2027
Redeemable during the next 12 months
Debt Instrument [Line Items]
Long-term Debt	$ 135.4
OG&E [Member] \| Redeemable during the next 12 months \| Garfield Industrial Authority Bond [Member]
Debt Instrument [Line Items]
Long term debt	47.0
OG&E [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority Bond Due 2025 [Member]
Debt Instrument [Line Items]
Long term debt	32.4
OG&E [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority Bond Due 2027 [Member]
Debt Instrument [Line Items]
Long term debt	$ 56.0
Minimum [Member] \| Redeemable during the next 12 months \| Garfield Industrial Authority Bond [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.23%
Minimum [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority Bond Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.20%
Minimum [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority Bond Due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.20%
Maximum [Member] \| Redeemable during the next 12 months \| Garfield Industrial Authority Bond [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.33%
Maximum [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority Bond Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.27%
Maximum [Member] \| Redeemable during the next 12 months \| Muskogee Industrial Authority Bond Due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.27%

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

3 Months Ended

Mar. 31, 2021

Mar. 31, 2020

Dec. 31, 2020

Short-term debt

$ 1,278.0

$ 95.0

Weighted Average Interest Rate

Aggregate Commitment

900.0

Long-term Line of Credit

^[1]

$ 278.4

0.33%

Debt Instrument, Face Amount

$ 1,000.0

Defined Benefit Plan, Plan Assets, Contributions by Employer

530.0

40.0

OGE Energy [Member]

Line of Credit Facility, Current Borrowing Capacity

^[2]

450.0

Weighted Average Interest Rate

Long-term Line of Credit

^[1],[2]

$ 278.0

^[2],[3]

0.33%

Maturity

^[2],[4]

Mar. 08, 2024

OGE Energy [Member] | Not Extended

Line of Credit Facility, Current Borrowing Capacity

$ 50.0

Maturity

Mar. 08, 2023

Line of Credit Facility, Current Borrowing Capacity

^[5],[6]

$ 450.0

Letters of Credit Outstanding, Amount

^[1],[5],[6]

$ 0.4

Weighted Average Interest Rate

^[3],[5],[6]

1.00%

Maturity

^[4],[5],[6]

Mar. 08, 2024

Short Term Borrowing Capacity That Has Regulatory Approval

$ 800.0

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

2 years

Intercompany borrowing agreement, maximum borrowing capacity

$ 350.0

Outstanding intercompany borrowings

0.0

Proceeds from Loans

470.0

Advances from parent

297.1

0.0

Deferred income taxes and investment tax credits, net

0.0

$ 272.0

Defined Benefit Plan, Plan Assets, Contributions by Employer

530.0

$ 0.0

$ 30.0

[1]	Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at March 31, 2021.
[2]	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.
[3]	Represents the weighted-average interest rate for the outstanding borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit.
[4]	In March 2017, the Registrants entered into unsecured five-year revolving credit agreements totaling $900.0 million ($450.0 million for OGE Energy and $450.0 million for OG&E). Each of the revolving credit facilities contained an option, which could be exercised up to two times, to extend the term of the respective facility for an additional year. In March 2018, the Registrants each utilized one of those extensions to extend the maturity of their respective credit facility from March 8, 2022 to March 8, 2023. In January 2021, the Registrants each utilized the second of those extensions to extend the maturity of their respective credit facility from March 8, 2023 to March 8, 2024. Commitments of a single existing lender with respect to $50.0 million of OGE Energy's credit facility, however, were not extended and, unless the non-extending lender is replaced in accordance with the terms of the credit facility, such commitments will expire March 8, 2023. The non-extending lender is not party to the OG&E facility.
[5]	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 March 8, 2024. At March 31, 2021, there were no intercompany borrowings under this agreement.
[6]	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.

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

3 Months Ended

Mar. 31, 2021

Mar. 31, 2020

Defined Benefit Plan, Plan Assets, Contributions by Employer

$ 40.0

Pension Plan [Member]

Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax

1.0

$ 0.0

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

3.0

3.7

3.5

4.6

(8.4)

(9.4)

2.8

3.8

26.4

0.0

Amount Attributable to Unconsolidated Affiliates

27.3

2.7

^[1]

0.1

0.5

Capitalized portion of net periodic pension benefit cost

27.2

2.2

0.8

1.0

Other Pension Plan [Member]

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

0.1

0.2

0.0

0.1

0.0

0.1

0.0

Amount Attributable to Unconsolidated Affiliates

0.2

0.4

^[1]

0.0

Postretirement Benefit Plan [Member]

0.2

0.4

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

0.1

0.8

1.1

(0.5)

Defined Benefit Plan, Amortization of Prior Service Cost (Credit)

0.7

0.6

^[2]

(1.7)

(2.1)

Amount Attributable to Unconsolidated Affiliates

(0.6)

(0.8)

^[3]

(0.1)

(0.2)

Capitalized portion of net periodic pension benefit cost

(0.5)

(0.6)

0.1

0.0

OKLAHOMA | Pension Plan [Member]

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

Additional Pension Expense to Meet State Requirements

^[4]

23.7

0.0

^[4]

(20.7)

1.7

OKLAHOMA | Postretirement Benefit Plan [Member]

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

Additional Pension Expense to Meet State Requirements

^[5]

0.1

0.2

ARKANSAS | Pension Plan [Member]

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

^[4]

2.2

0.0

Defined Benefit Plan, Plan Assets, Contributions by Employer

30.0

OG&E [Member] | Pension Plan [Member]

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

2.1

2.6

2.5

3.4

(6.1)

(7.1)

2.0

2.8

22.2

0.0

Amount attributable to parent

22.7

1.7

^[1]

3.9

0.5

Capitalized portion of net periodic pension benefit cost

26.6

2.2

0.7

0.9

OG&E [Member] | Other Pension Plan [Member]

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

0.0

0.1

0.0

0.0

0.0

0.1

0.0

Amount attributable to parent

0.0

0.2

^[1]

0.2

OG&E [Member] | Postretirement Benefit Plan [Member]

0.2

0.4

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

0.1

0.0

0.6

0.8

(0.4)

Defined Benefit Plan, Amortization of Prior Service Cost (Credit)

0.7

^[2]

(1.3)

(1.5)

Amount attributable to parent

(0.3)

(0.4)

^[3]

(0.1)

(0.2)

Capitalized portion of net periodic pension benefit cost

(0.4)

(0.6)

$ 0.0

[1]	"Amount paid by unconsolidated affiliates" is only applicable to OGE Energy. "Amount allocated from OGE Energy" is only applicable to OG&E.
[2]	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.
[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]	Included in the Pension tracker, as presented in the regulatory assets and liabilities table in Note 1.

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

3 Months Ended

Mar. 31, 2021

Mar. 31, 2020

Dec. 31, 2020

$ 1,630.6

$ 431.3

1,346.8

135.0

109.3

120.0

98.7

94.4

27.2

25.6

48.6

56.3

53.2

(746.5)

^[1]

0.9

2.1

39.4

38.3

10.6

(234.6)

52.7

(491.8)

432.8

367.5

$ 397.4

Electric Utility [Member]

11,788.7

10,370.9

$ 10,718.8

1,630.6

431.3

1,346.8

135.0

110.3

121.0

98.7

94.4

25.7

23.9

49.1

57.0

0.0

^[1]

1.7

1.8

38.4

36.9

1.2

2.0

11.2

19.9

0.0

Natural Gas Midstream Operations [Member]

11,248.2

10,030.7

0.0

0.0

0.4

0.6

0.0

0.1

(0.5)

(0.7)

53.2

(746.5)

^[1]

(0.5)

0.0

0.0

14.3

(179.2)

37.9

(568.0)

409.2

348.0

Other Operations [Member]

415.4

353.4

0.0

0.0

(1.4)

(1.6)

0.0

1.4

1.6

0.0

0.0

^[1]

(0.1)

1.3

1.2

2.4

(4.9)

(57.4)

3.6

56.3

23.6

19.5

521.6

252.9

Eliminations [Member]

0.0

0.0

0.0

0.0

0.0

0.0

0.0

^[1]

(0.2)

(1.0)

(0.2)

(1.0)

0.0

0.0

0.0