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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Taxes [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) | The following table presents the components of income tax expense (benefit).
|  | OGE Energy |  |  | OG&E |
Year Ended December 31 (In millions) |  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |
Provision (benefit) for current income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 46.1 |  |  | $ | 250.8 |  |  | $ | 16.4 |  |  | $ | 48.9 |  |  | $ | (141.2 | ) |  | $ | (9.0 | )
State |  |  | (2.2 | ) |  |  | 28.8 |  |  |  | 1.7 |  |  |  | 3.7 |  |  |  | (0.9 | ) |  |  | 9.0 |
Total provision (benefit) for current income taxes |  |  | 43.9 |  |  |  | 279.6 |  |  |  | 18.1 |  |  |  | 52.6 |  |  |  | (142.1 | ) |  |  | — |
Provision (benefit) for deferred income taxes, net: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 18.1 |  |  |  | (110.8 | ) |  |  | 133.1 |  |  |  | 18.8 |  |  |  | 219.9 |  |  |  | 58.3 |
State |  |  | (5.8 | ) |  |  | (45.2 | ) |  |  | (10.0 | ) |  |  | (2.6 | ) |  |  | (1.4 | ) |  |  | (16.5 | )
Total provision (benefit) for deferred income taxes, net |  |  | 12.3 |  |  |  | (156.0 | ) |  |  | 123.1 |  |  |  | 16.2 |  |  |  | 218.5 |  |  |  | 41.8 |
Total income tax expense |  | $ | 56.2 |  |  | $ | 123.6 |  |  | $ | 141.2 |  |  | $ | 68.8 |  |  | $ | 76.4 |  |  | $ | 41.8 |
Schedule of Effective Income Tax Rate Reconciliation | The following table presents a reconciliation of the statutory tax rates to the effective income tax rate.
|  | OGE Energy |  |  | OG&E |
Year Ended December 31 |  | 2023 |  | 2022 |  | 2021 |  |  | 2023 |  | 2022 |  | 2021 |
Statutory federal tax rate |  |  | 21.0 | % |  | 21.0 | % |  | 21.0 | % |  |  | 21.0 | % |  | 21.0 | % |  | 21.0 | %
State income taxes, net of federal income tax benefit |  |  | (1.3 | ) |  | (1.0 | ) |  | 0.9 |  |  |  | 0.3 |  |  | (0.4 | ) |  | (1.4 | )
Stock-based compensation |  |  | 0.1 |  |  | — |  |  | 0.1 |  |  |  | — |  |  | — |  |  | — |
Executive compensation limitation |  |  | 0.2 |  |  | 0.1 |  |  | 0.1 |  |  |  | — |  |  | — |  |  | — |
Amortization of net unfunded deferred taxes |  |  | (7.0 | ) |  | (3.2 | ) |  | (2.1 | ) |  |  | (6.7 | ) |  | (5.0 | ) |  | (4.6 | )
Federal renewable energy credit (A) |  |  | — |  |  | — |  |  | (2.0 | ) |  |  | — |  |  | — |  |  | (4.4 | )
Remeasurement of state deferred taxes due to Energy Transfer merger |  |  | — |  |  | — |  |  | (1.1 | ) |  |  | — |  |  | — |  |  | — |
Remeasurement of state deferred tax liabilities |  |  | — |  |  | (0.6 | ) |  | (0.6 | ) |  |  | — |  |  | — |  |  | — |
401(k) dividends |  |  | (0.3 | ) |  | (0.2 | ) |  | (0.2 | ) |  |  | — |  |  | — |  |  | — |
Other |  |  | (0.8 | ) |  | (0.4 | ) |  | — |  |  |  | (0.7 | ) |  | (0.8 | ) |  | (0.2 | )
Effective income tax rate |  |  | 11.9 | % |  | 15.7 | % |  | 16.1 | % |  |  | 13.9 | % |  | 14.8 | % |  | 10.4 | %
(A) Represents credits primarily associated with the production from OG&E's wind farms.
Schedule of Deferred Tax Assets and Liabilities | The following table presents the components of Deferred Income Taxes at December 31, 2023 and 2022.
|  | OGE Energy |  |  | OG&E |
December 31 (In millions) |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Deferred income tax liabilities, net: |  |  |  |  |  |  |  |  |  |  |  |
Accelerated depreciation and other property related differences |  | $ | 1,753.8 |  |  | $ | 1,714.5 |  |  | $ | 1,753.8 |  |  | $ | 1,714.5 |
Regulatory assets |  |  | 67.6 |  |  |  | 54.8 |  |  |  | 67.6 |  |  |  | 54.7 |
Pension Plan |  |  | 21.8 |  |  |  | 18.0 |  |  |  | 37.9 |  |  |  | 35.4 |
Corporate owned life insurance |  |  | 2.6 |  |  |  | 2.4 |  |  |  | — |  |  |  | — |
Bond redemption-unamortized costs |  |  | 1.4 |  |  |  | 1.6 |  |  |  | 1.4 |  |  |  | 1.6 |
Income taxes recoverable from customers, net |  |  | (202.7 | ) |  |  | (216.7 | ) |  |  | (202.7 | ) |  |  | (216.7 | )
State tax credits |  |  | (228.8 | ) |  |  | (221.2 | ) |  |  | (213.5 | ) |  |  | (208.5 | )
Regulatory liabilities |  |  | (54.4 | ) |  |  | (60.8 | ) |  |  | (54.4 | ) |  |  | (60.8 | )
Asset retirement obligations |  |  | (19.7 | ) |  |  | (18.8 | ) |  |  | (19.7 | ) |  |  | (18.8 | )
Postretirement medical and life insurance benefits |  |  | (20.8 | ) |  |  | (19.2 | ) |  |  | (14.0 | ) |  |  | (12.7 | )
Accrued liabilities |  |  | (13.2 | ) |  |  | (11.2 | ) |  |  | (5.5 | ) |  |  | (7.3 | )
Deferred federal investment tax credits |  |  | (2.7 | ) |  |  | (2.9 | ) |  |  | (2.7 | ) |  |  | (2.9 | )
Accrued vacation |  |  | (1.4 | ) |  |  | (1.4 | ) |  |  | (1.4 | ) |  |  | (1.1 | )
Uncollectible accounts |  |  | (0.5 | ) |  |  | (0.5 | ) |  |  | (0.4 | ) |  |  | (0.5 | )
Other |  |  | (2.2 | ) |  |  | (5.1 | ) |  |  | (5.6 | ) |  |  | (5.8 | )
Total deferred income tax liabilities, net |  | $ | 1,300.8 |  |  | $ | 1,233.5 |  |  | $ | 1,340.8 |  |  | $ | 1,271.1 |
Schedule of Unrecognized Tax Benefits Roll Forward | The following table presents a reconciliation of the Registrants' total gross unrecognized tax benefits as of the years ended December 31, 2023, 2022 and 2021.
(In millions) |  | 2023 |  |  | 2022 |  |  | 2021 |
Balance at January 1 |  | $ | 20.7 |  |  | $ | 22.4 |  |  | $ | 21.9 |
Tax positions related to current year: |  |  |  |  |  |  |  |  |
Additions |  |  | 7.9 |  |  |  | — |  |  |  | 1.7 |
Reductions |  |  | — |  |  |  | (1.7 | ) |  |  | (1.2 | )
Balance at December 31 |  | $ | 28.6 |  |  | $ | 20.7 |  |  | $ | 22.4 |
Summary of Tax Credit Carryforwards | The following table presents a summary of the Registrants' tax credits carried forward as deferred tax assets. Under current law, the Registrants expect future taxable income will be sufficient to utilize all credits before they begin to expire after 2028.
|  | OGE Energy |  |  | OG&E |  |  |
(In millions) |  | Carry Forward Amount |  |  | Deferred Tax Asset |  |  | Carry Forward Amount |  |  | Deferred Tax Asset |  |  | Earliest Expiration Date
State tax credits: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oklahoma investment tax credits |  | $ | 259.1 |  |  | $ | 204.7 |  |  | $ | 239.8 |  |  | $ | 189.4 |  |  | N/A
Oklahoma capital investment board credits |  | $ | 12.8 |  |  | $ | 12.8 |  |  | $ | 12.8 |  |  | $ | 12.8 |  |  | N/A
Oklahoma zero emission tax credits |  | $ | 16.0 |  |  | $ | 11.3 |  |  | $ | 16.0 |  |  | $ | 11.3 |  |  | 2028
N/A - not applicable

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