Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Regulatory Assets and Liabilities

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

	March 31,		December 31,
(In millions)	2023		2022
REGULATORY ASSETS
Current:
Oklahoma fuel clause under recoveries	$	334.7	$	474.3
Arkansas fuel clause under recoveries		35.4		40.6
Oklahoma Energy Efficiency Rider under recoveries (A)		3.3		7.7
Other (A)		5.2		4.7
Total current regulatory assets	$	378.6	$	527.3
Non-current:
Oklahoma deferred storm expenses	$	212.4	$	206.3
Benefit obligations regulatory asset		100.6		119.7
Pension tracker		77.7		57.2
Arkansas Winter Storm Uri costs		76.4		78.2
Sooner Dry Scrubbers		17.9		18.1
Arkansas deferred pension expenses		13.5		12.3
Unamortized loss on reacquired debt		7.8		8.0
COVID-19 impacts		7.6		7.7
Frontier Plant deferred expenses		4.8		5.2
Other		12.9		11.6
Total non-current regulatory assets	$	531.6	$	524.3
REGULATORY LIABILITIES
Current:
SPP cost tracker over recovery (B)	$	6.9	$	3.0
Other (B)		2.4		2.5
Total current regulatory liabilities	$	9.3	$	5.5
Non-current:
Income taxes refundable to customers, net	$	880.2	$	894.7
Accrued removal obligations, net		241.2		250.5
Other		1.8		1.9
Total non-current regulatory liabilities	$	1,123.2	$	1,147.1

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

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

Schedule of 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, 2023 and 2022. All amounts below are presented net of tax.

(In millions)	Pension Plan and Restoration of Retirement Income Plan			Postretirement Benefit Plans			Total
Balance at December 31, 2022	$	(18.5	)	$	6.6		$	(11.9	)
Amounts reclassified from accumulated other comprehensive income (loss)		0.3			(0.1	)		0.2
Settlement cost		0.9			—			0.9
Balance at March 31, 2023	$	(17.3	)	$	6.5		$	(10.8	)

(In millions)	Pension Plan and Restoration of Retirement Income Plan			Postretirement Benefit Plans		Total
Balance at December 31, 2021	$	(26.1	)	$	1.3	$	(24.8	)
Amounts reclassified from accumulated other comprehensive income		0.4			—		0.4
Settlement cost		7.4			—		7.4
Balance at March 31, 2022	$	(18.3	)	$	1.3	$	(17.0	)

Schedule of Amounts Reclassified out of Accumulated Other Comprehensive Income

The following table presents significant amounts reclassified out of accumulated other comprehensive income (loss) attributable to OGE Energy by the respective line items in net income during the three months ended March 31, 2023 and 2022.

Details about Accumulated Other Comprehensive Income (Loss) Components	Amount Reclassified from Accumulated Other Comprehensive Income (Loss)						Affected Line Item in OGE Energy's Statements of Income
	Three Months Ended
	March 31,
(In millions)	2023			2022
Amortization of Pension Plan and Restoration of Retirement Income Plan items:
Actuarial losses	$	(0.3	)	$	(0.4	)	(A)
Prior service cost		(0.1	)		(0.1	)	(A)
Settlement cost		(1.1	)		(9.6	)	(A)
		(1.5	)		(10.1	)	Income Before Taxes
		(0.3	)		(2.3	)	Income Tax Expense
	$	(1.2	)	$	(7.8	)	Net Income
Amortization of postretirement benefit plans items:
Actuarial gains	$	0.1		$	—		(A)
		0.1			—		Income Before Taxes
		—			—		Income Tax Expense
	$	0.1		$	—		Net Income
Total reclassifications for the period, net of tax	$	(1.1	)	$	(7.8	)	Net Income

(A)These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 10 for additional information).