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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 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.
|  | September 30, |  |  | December 31, |
(In millions) |  | 2024 |  |  | 2023 |
REGULATORY ASSETS |  |  |  |  |  |
Current: |  |  |  |  |  |
Oklahoma fuel clause under recoveries |  | $ | 43.3 |  |  | $ | — |
Oklahoma Energy Efficiency Rider under recoveries (A) |  |  | 5.0 |  |  |  | 3.8 |
Other (A) |  |  | 4.7 |  |  |  | 2.7 |
Total current regulatory assets |  | $ | 53.0 |  |  | $ | 6.5 |
Non-current: |  |  |  |  |  |
Oklahoma deferred storm expenses |  | $ | 247.1 |  |  | $ | 261.1 |
Pension tracker |  |  | 102.0 |  |  |  | 91.9 |
Benefit obligations regulatory asset |  |  | 89.8 |  |  |  | 89.4 |
Arkansas Winter Storm Uri costs |  |  | 64.8 |  |  |  | 71.0 |
Sooner Dry Scrubbers |  |  | 16.6 |  |  |  | 17.2 |
Oklahoma SAP S/4 HANA deferred expenses |  |  | 13.1 |  |  |  | 6.0 |
Arkansas deferred pension expenses |  |  | 11.4 |  |  |  | 12.7 |
Unamortized loss on reacquired debt |  |  | 6.6 |  |  |  | 7.2 |
COVID-19 impacts |  |  | 5.7 |  |  |  | 6.8 |
Frontier Plant deferred expenses |  |  | 2.5 |  |  |  | 3.6 |
Other |  |  | 13.1 |  |  |  | 10.7 |
Total non-current regulatory assets |  | $ | 572.7 |  |  | $ | 577.6 |
REGULATORY LIABILITIES |  |  |  |  |  |
Current: |  |  |  |  |  |
Arkansas fuel clause over recoveries |  | $ | 16.4 |  |  | $ | 4.9 |
SPP cost tracker over recoveries (B) |  |  | 7.9 |  |  |  | 10.4 |
Oklahoma fuel clause over recoveries |  |  | — |  |  |  | 15.6 |
Other (B) |  |  | 3.9 |  |  |  | 2.3 |
Total current regulatory liabilities |  | $ | 28.2 |  |  | $ | 33.2 |
Non-current: |  |  |  |  |  |
Income taxes refundable to customers, net |  | $ | 796.1 |  |  | $ | 838.0 |
Accrued removal obligations, net |  |  | 216.6 |  |  |  | 222.0 |
Other |  |  | 1.9 |  |  |  | 1.6 |
Total non-current regulatory liabilities |  | $ | 1,014.6 |  |  | $ | 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 nine months ended September 30, 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) |  | 0.3 |  |  | (0.1 | ) |  | 0.2 |
Regulatory classification of certain pension costs |  | 3.9 |  |  | — |  |  | 3.9 |
Balance at September 30, 2024 | $ | (8.7 | ) | $ | 5.6 |  | $ | (3.1 | )
(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) |  | 0.8 |  |  | (0.1 | ) |  | 0.7 |
Settlement cost |  | 1.1 |  |  | — |  |  | 1.1 |
Balance at September 30, 2023 | $ | (16.6 | ) | $ | 6.5 |  | $ | (10.1 | )
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 and nine months ended September 30, 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 |  |  | Nine Months Ended |  |  |
|  | September 30, |  |  | September 30, |  |  |
(In millions) |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |  |  |
Amortization of Pension Plan and Restoration of Retirement Income Plan items: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actuarial losses |  | $ | — |  |  | $ | (0.2 | ) |  | $ | (0.2 | ) |  | $ | (0.8 | ) |  | (A)
Prior service cost |  |  | (0.1 | ) |  |  | (0.1 | ) |  |  | (0.2 | ) |  |  | (0.2 | ) |  | (A)
Settlement cost |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1.4 | ) |  | (A)
|  |  | (0.1 | ) |  |  | (0.3 | ) |  |  | (0.4 | ) |  |  | (2.4 | ) |  | Income Before Taxes
|  |  | — |  |  |  | (0.1 | ) |  |  | (0.1 | ) |  |  | (0.5 | ) |  | Income Tax Expense
|  | $ | (0.1 | ) |  | $ | (0.2 | ) |  | $ | (0.3 | ) |  | $ | (1.9 | ) |  | Net Income
Amortization of postretirement benefit plans items: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actuarial gains |  | $ | — |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.2 |  |  | (A)
|  |  | — |  |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.2 |  |  | Income Before Taxes
|  |  | — |  |  |  | 0.1 |  |  |  | — |  |  |  | 0.1 |  |  | Income Tax Expense
|  | $ | — |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | Net Income
Total reclassifications for the period, net of tax |  | $ | (0.1 | ) |  | $ | (0.2 | ) |  | $ | (0.2 | ) |  | $ | (1.8 | ) |  | 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).

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