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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2025
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) |  | 2025 |  |  | 2024 |
REGULATORY ASSETS |  |  |  |  |  |
Current: |  |  |  |  |  |
Oklahoma fuel clause under recoveries |  | $ | 38.5 |  |  | $ | 112.7 |
SPP cost tracker under recoveries (A) |  |  | 3.9 |  |  |  | — |
Oklahoma Energy Efficiency Rider under recoveries (A) |  |  | — |  |  |  | 7.0 |
Other (A) |  |  | 5.2 |  |  |  | 3.8 |
Total current regulatory assets |  | $ | 47.6 |  |  | $ | 123.5 |
Non-current: |  |  |  |  |  |
Oklahoma deferred storm expenses |  | $ | 236.1 |  |  | $ | 244.3 |
Pension tracker |  |  | 89.8 |  |  |  | 94.7 |
Benefit obligations regulatory asset |  |  | 86.0 |  |  |  | 90.8 |
Arkansas Winter Storm Uri costs |  |  | 56.2 |  |  |  | 63.0 |
Oklahoma SAP S/4 HANA deferred expenses |  |  | 16.7 |  |  |  | 14.3 |
Sooner Dry Scrubbers |  |  | 15.8 |  |  |  | 16.4 |
Arkansas deferred pension expenses |  |  | 9.6 |  |  |  | 11.0 |
Arkansas capacity power purchase agreements |  |  | 6.6 |  |  |  | 3.5 |
Unamortized loss on reacquired debt |  |  | 5.7 |  |  |  | 6.3 |
Oklahoma SB 998 deferred costs, net |  |  | 5.0 |  |  |  | — |
Oklahoma vegetation management program deferred costs |  |  | 4.5 |  |  |  | 6.4 |
COVID-19 impacts |  |  | 4.4 |  |  |  | 5.4 |
Other |  |  | 10.3 |  |  |  | 12.0 |
Total non-current regulatory assets |  | $ | 546.7 |  |  | $ | 568.1 |
REGULATORY LIABILITIES |  |  |  |  |  |
Current: |  |  |  |  |  |
Oklahoma Energy Efficiency Rider over recoveries (B) |  | $ | 11.9 |  |  | $ | — |
Arkansas fuel clause over recoveries |  |  | 10.0 |  |  |  | 9.3 |
Oklahoma Investment Tax Credit over recoveries (B) |  |  | 2.6 |  |  |  | 6.1 |
Other (B) |  |  | — |  |  |  | 4.9 |
Total current regulatory liabilities |  | $ | 24.5 |  |  | $ | 20.3 |
Non-current: |  |  |  |  |  |
Income taxes refundable to customers, net |  | $ | 733.8 |  |  | $ | 780.8 |
Accrued removal obligations, net |  |  | 233.8 |  |  |  | 231.9 |
Other |  |  | 3.6 |  |  |  | 3.7 |
Total non-current regulatory liabilities |  | $ | 971.2 |  |  | $ | 1,016.4 |
(A) Included in Other Current Assets in the condensed balance sheets. (B) Included in Other Current Liabilities in the condensed balance sheets. As discussed below, SB 998 became effective August 29, 2025. This legislation allows OG&E to establish a regulatory asset to defer 90 percent of depreciation expense and debt return associated with qualified plant investments for recovery over an allowed 20-year period in a future rate filing. OG&E began deferring costs for qualified plant investments in September 2025.
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, 2025 and 2024. 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, 2024 | $ | (8.8 | ) | $ | 6.1 |  | $ | (2.7 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  | 0.4 |  |  | (0.1 | ) |  | 0.3 |
Balance at September 30, 2025 | $ | (8.4 | ) | $ | 6.0 |  | $ | (2.4 | )
(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 | )
Reclassified Out of Accumulated Other Comprehensive Income (Loss) | 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, 2025 and 2024.
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) |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |  |  |
Amortization of Pension Plan and Restoration of Retirement Income Plan items: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actuarial losses |  | $ | (0.1 | ) |  | $ | — |  |  | $ | (0.3 | ) |  | $ | (0.2 | ) |  | (A)
Prior service cost |  |  | (0.1 | ) |  |  | (0.1 | ) |  |  | (0.2 | ) |  |  | (0.2 | ) |  | (A)
|  |  | (0.2 | ) |  |  | (0.1 | ) |  |  | (0.5 | ) |  |  | (0.4 | ) |  | Income Before Taxes
|  |  | — |  |  |  | — |  |  |  | (0.1 | ) |  |  | (0.1 | ) |  | Income Tax Expense
|  | $ | (0.2 | ) |  | $ | (0.1 | ) |  | $ | (0.4 | ) |  | $ | (0.3 | ) |  | Net Income
Amortization of postretirement benefit plans items: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actuarial gains |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.2 |  |  | $ | 0.1 |  |  | (A)
|  |  | 0.1 |  |  |  | — |  |  |  | 0.2 |  |  |  | 0.1 |  |  | Income Before Taxes
|  |  | — |  |  |  | — |  |  |  | 0.1 |  |  |  | — |  |  | Income Tax Expense
|  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | Net Income
Total reclassifications for the period, net of tax |  | $ | (0.1 | ) |  | $ | (0.1 | ) |  | $ | (0.3 | ) |  | $ | (0.2 | ) |  | 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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