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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2024
Stock-Based Compensation [Abstract] |
Schedule of Pre-tax Compensation Expense and Related Income Tax Benefit | The following table presents the Registrants' pre-tax compensation expense and related income tax benefit for the years ended December 31, 2024, 2023 and 2022 related to performance units and restricted stock units for the Registrants' employees. As a result of OGE Energy's exit of its former midstream business and becoming primarily an electric company, all employees are directly employed by OG&E beginning in 2024.
|  | OGE Energy |  |  | OG&E |
Year Ended December 31 (In millions) |  | 2024 |  |  | 2023 |  |  | 2022 |  |  | 2024 |  |  | 2023 |  |  | 2022 |
Performance units |  | $ | 7.9 |  |  | $ | 9.3 |  |  | $ | 7.2 |  |  | $ | 7.9 |  |  | $ | 2.2 |  |  | $ | 2.2 |
Restricted stock units |  |  | 3.8 |  |  |  | 3.8 |  |  |  | 2.5 |  |  |  | 3.8 |  |  |  | 0.9 |  |  |  | 0.7 |
Total compensation expense |  | $ | 11.7 |  |  | $ | 13.1 |  |  | $ | 9.7 |  |  | $ | 11.7 |  |  | $ | 3.1 |  |  | $ | 2.9 |
Income tax benefit |  | $ | 2.8 |  |  | $ | 3.2 |  |  | $ | 2.3 |  |  | $ | 2.8 |  |  | $ | 0.7 |  |  | $ | 0.7 |
Schedule of Performance Units Granted and Assumptions Used to Calculate Grant Date Fair Value of Performance Units | The following table presents the number of performance units granted and the assumptions used to calculate the grant date fair value of the performance units.
| OGE Energy |  |  | OG&E |
| 2024 |  | 2023 |  | 2022 |  |  | 2024 |  | 2023 |  | 2022 |
Number of units granted |  | 275,499 |  |  | 213,442 |  |  | 216,437 |  |  |  | 275,499 |  |  | 65,069 |  |  | 60,923 |
Fair value of units granted | $ | 35.86 |  | $ | 43.74 |  | $ | 41.10 |  |  | $ | 35.86 |  | $ | 43.74 |  | $ | 41.10 |
Expected dividend yield |  | 5.1 | % |  | 4.2 | % |  | 4.8 | % |  |  | 5.1 | % |  | 4.2 | % |  | 4.8 | %
Expected price volatility |  | 19.9 | % |  | 31.0 | % |  | 9.0 | % |  |  | 19.9 | % |  | 31.0 | % |  | 29.0 | %
Risk-free interest rate |  | 4.41 | % |  | 4.47 | % |  | 1.71 | % |  |  | 4.41 | % |  | 4.47 | % |  | 1.71 | %
Expected life of units (in years) |  | 2.86 |  |  | 2.85 |  |  | 2.85 |  |  |  | 2.86 |  |  | 2.85 |  |  | 2.85 |
Schedule of Restricted Stock Units Granted and Grant Date Fair Value | The following table presents the number of restricted stock units granted and the grant date fair value.
|  | OGE Energy |  |  | OG&E |
|  | 2024 |  |  | 2023 |  |  | 2022 |  |  | 2024 |  |  | 2023 |  |  | 2022 |
Restricted stock units granted |  |  | 148,345 |  |  |  | 114,926 |  |  |  | 116,539 |  |  |  | 148,345 |  |  |  | 35,034 |  |  |  | 32,804 |
Fair value of restricted stock units granted |  | $ | 32.74 |  |  | $ | 37.52 |  |  | $ | 35.72 |  |  | $ | 32.74 |  |  | $ | 37.52 |  |  | $ | 35.72 |
Schedule of Activity for Performance Units and Restricted Stock Units | The following tables present a summary of the activity for the Registrants' performance units and restricted stock units for the year ended December 31, 2024.
OGE Energy | Performance Units |  |  | Restricted Stock Units |
(Dollars in millions) | Number of Units |  |  | Aggregate Intrinsic Value |  |  | Number of Shares |  |  | Aggregate Intrinsic Value |
Units/shares outstanding at 12/31/23 |  | 652,118 |  |  |  |  |  |  | 223,146 |  |  |  |
Granted |  | 275,499 |  | (A) |  |  |  |  | 148,345 |  |  |  |
Converted |  | (234,672 | ) | (B) | $ | 12.7 |  |  | N/A |  |  |  |
Vested | N/A |  |  |  |  |  |  | (101,130 | ) |  | $ | 4.2 |
Forfeited |  | (46,753 | ) |  |  |  |  |  | (26,307 | ) |  |  |
Units/shares outstanding at 12/31/24 |  | 646,192 |  |  | $ | 42.5 |  |  |  | 244,054 |  |  | $ | 10.1 |
Units/shares fully vested at 12/31/24 |  | 191,918 |  | (C) | $ | 12.5 |  |  | N/A |  |  | N/A |
OG&E | Performance Units |  |  | Restricted Stock Units |
(Dollars in millions) | Number of Units |  |  | Aggregate Intrinsic Value |  |  | Number of Shares |  |  | Aggregate Intrinsic Value |
Units/shares outstanding at 12/31/23 |  | 183,837 |  |  |  |  |  |  | 64,244 |  |  |  |
Granted |  | 275,499 |  | (A) |  |  |  |  | 148,345 |  |  |  |
Converted |  | (234,672 | ) | (B) | $ | 12.7 |  |  | N/A |  |  |  |
Vested | N/A |  |  |  |  |  |  | (101,130 | ) |  | $ | 4.2 |
Forfeited |  | (46,753 | ) |  |  |  |  |  | (26,307 | ) |  |  |
Employee migration |  | 468,281 |  | (D) |  |  |  |  | 158,902 |  | (D) |  |
Units/shares outstanding at 12/31/24 |  | 646,192 |  |  | $ | 42.5 |  |  |  | 244,054 |  |  | $ | 10.1 |
Units/shares fully vested at 12/31/24 |  | 191,918 |  | (C) | $ | 12.5 |  |  | N/A |  |  | N/A |
(A) For performance units, this represents the target number of performance units granted. Actual number of performance units earned, if any, is dependent upon performance and may range from zero percent to 200 percent of the target. (B) These amounts represent performance units that vested at December 31, 2023, which were settled in February 2024. (C) These amounts represent performance units that vested at December 31, 2024. Actual expected amounts to be paid out in 2025 will differ based on the percentage at which the performance metric was met and are dependent upon Compensation Committee approval. (D) As a result of OGE Energy's exit of its former midstream business and becoming primarily an electric company, all employees are directly employed by OG&E beginning in 2024.
Summary of Activity for Non-vested Performance Units and Restricted Stock Units | The following tables present a summary of the activity for the Registrants' non-vested performance units and restricted stock units for the year ended December 31, 2024.
OGE Energy | Performance Units |  |  | Restricted Stock Units |
| Number of Units |  |  | Weighted-Average Grant Date Fair Value |  |  | Number of Shares |  |  | Weighted-Average Grant Date Fair Value |
Units/shares non-vested at 12/31/23 |  | 417,446 |  |  | $ | 42.44 |  |  |  | 223,146 |  |  | $ | 36.64 |
Granted |  | 275,499 |  | (A) | $ | 35.86 |  |  |  | 148,345 |  |  | $ | 32.74 |
Vested |  | (191,918 | ) |  | $ | 41.10 |  |  |  | (101,130 | ) |  | $ | 41.29 |
Forfeited |  | (46,753 | ) |  | $ | 39.85 |  |  |  | (26,307 | ) |  | $ | 35.13 |
Units/shares non-vested at 12/31/24 |  | 454,274 |  |  | $ | 39.28 |  |  |  | 244,054 |  |  | $ | 34.81 |
OG&E | Performance Units |  |  | Restricted Stock Units |
| Number of Units |  |  | Weighted-Average Grant Date Fair Value |  |  | Number of Shares |  |  | Weighted-Average Grant Date Fair Value |
Units/shares non-vested at 12/31/23 |  | 120,331 |  |  | $ | 42.49 |  |  |  | 64,244 |  |  | $ | 36.68 |
Granted |  | 275,499 |  | (A) | $ | 35.86 |  |  |  | 148,345 |  |  | $ | 32.74 |
Vested |  | (191,918 | ) |  | $ | 41.10 |  |  |  | (101,130 | ) |  | $ | 41.29 |
Forfeited |  | (46,753 | ) |  | $ | 39.85 |  |  |  | (26,307 | ) |  | $ | 35.13 |
Employee migration |  | 297,115 |  | (B) | $ | 42.42 |  |  |  | 158,902 |  | (B) | $ | 36.62 |
Units/shares non-vested at 12/31/24 |  | 454,274 |  |  | $ | 39.28 |  |  |  | 244,054 |  |  | $ | 34.81 |
(A) For performance units, this represents the target number of performance units granted. Actual number of performance units earned, if any, is dependent upon performance and may range from zero percent to 200 percent of the target. (B) As a result of OGE Energy's exit of its former midstream business and becoming primarily an electric company, all employees are directly employed by OG&E beginning in 2024.
Summary of Fair Value for Vested Performance Units and Restricted Stock Units | The following table presents a summary of the Registrants' fair value for vested performance units and restricted stock units.
|  | OGE Energy |  |  | OG&E |
Year Ended December 31 (In millions) |  | 2024 |  |  | 2023 |  |  | 2022 |  |  | 2024 |  |  | 2023 |  |  | 2022 |
Performance units |  | $ | 7.9 |  |  | $ | 9.0 |  |  | $ | 6.2 |  |  | $ | 7.9 |  |  | $ | 2.4 |  |  | $ | 1.7 |
Restricted stock units |  | $ | 3.6 |  |  | $ | 2.4 |  |  | $ | 2.1 |  |  | $ | 3.6 |  |  | $ | 0.6 |  |  | $ | 0.5 |
Summary of Unrecognized Compensation Cost and Weighted-average Periods Over which Compensation Cost is Expected to be Recognized | The following table presents a summary of the Registrants' unrecognized compensation cost for non-vested performance units and restricted stock units and the weighted-average periods over which the compensation cost is expected to be recognized.
|  | OGE Energy |  |  | OG&E |
December 31, 2024 |  | Unrecognized Compensation Cost (In millions) |  |  | Weighted Average to be Recognized (In years) |  |  | Unrecognized Compensation Cost (In millions) |  |  | Weighted Average to be Recognized (In years) |
Performance units |  | $ | 8.3 |  |  |  | 1.67 |  |  | $ | 8.3 |  |  |  | 1.67 |
Restricted stock units |  |  | 3.9 |  |  |  | 1.68 |  |  |  | 3.9 |  |  |  | 1.68 |
Total unrecognized compensation cost |  | $ | 12.2 |  |  |  |  |  | $ | 12.2 |  |  |  |

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