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Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2024

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)		2024				2023
REGULATORY ASSETS
Current:
Oklahoma Energy Efficiency Rider under recoveries (A)		$	1.7			$	3.8
Other (A)			2.3				2.7
Total current regulatory assets		$	4.0			$	6.5
Non-current:
Oklahoma deferred storm expenses		$	254.9			$	261.1
Pension tracker			95.6				91.9
Benefit obligations regulatory asset			92.8				89.4
Arkansas Winter Storm Uri costs			69.2				71.0
Sooner Dry Scrubbers			17.0				17.2
Arkansas deferred pension expenses			12.4				12.7
Oklahoma SAP S/4 HANA deferred expenses			7.6				6.0
Unamortized loss on reacquired debt			7.0				7.2
COVID-19 impacts			6.4				6.8
Frontier Plant deferred expenses			3.2				3.6
Other			10.5				10.7
Total non-current regulatory assets		$	576.6			$	577.6
REGULATORY LIABILITIES
Current:
Oklahoma fuel clause over recoveries		$	19.9			$	15.6
Arkansas fuel clause over recoveries			16.6				4.9
SPP cost tracker over recoveries (B)			10.8				10.4
Other (B)			1.0				2.3
Total current regulatory liabilities		$	48.3			$	33.2
Non-current:
Income taxes refundable to customers, net		$	823.9			$	838.0
Accrued removal obligations, net			222.0				222.0
Other			1.5				1.6
Total non-current regulatory liabilities		$	1,047.4			$	1,061.6

(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, 2024 and 2023. 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, 2023		$	(12.9	)		$	5.7			$	(7.2	)
Amounts reclassified from accumulated other comprehensive income (loss)			0.1				(0.1	)			—
Regulatory classification of certain pension costs			3.9				—				3.9
Balance at March 31, 2024		$	(8.9	)		$	5.6			$	(3.3	)


(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	)

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, 2024 and 2023.


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)		2024				2023
Amortization of Pension Plan and Restoration of Retirement Income Plan items:
Actuarial losses		$	(0.1	)		$	(0.3	)		(A)
Prior service cost			(0.1	)			(0.1	)		(A)
Settlement cost			—				(1.1	)		(A)
			(0.2	)			(1.5	)		Income Before Taxes
			(0.1	)			(0.3	)		Income Tax Expense
		$	(0.1	)		$	(1.2	)		Net Income

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

Total reclassifications for the period, net of tax		$	—			$	(1.1	)		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).