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Rate Matters and Regulation - Additional Information (Details) - USD ($) |  |  |  | 1 Months Ended |
--- | --- | --- | --- | --- | ---
May 15, 2025 | Nov. 26, 2024 | Jun. 12, 2024 | Dec. 31, 2023 | Jun. 30, 2025
CWIP incentive and abandoned plant incentive cost | $ 242,000,000 |  |  |  |
Estimated Refund to SPP |  |  |  |  | $ 14,000,000
Requested Recovery of Capital Investment |  |  |  | $ 1,300,000,000 |
OKLAHOMA [Member] |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | $ 126,700,000 | $ 126,700,000 | $ 332,500,000 |
Public Utilities, Requested Return on Equity, Percentage |  | 9.50% |  | 10.50% |
Common Equity Percentage which ROE is based |  | 53.50% |  | 53.50% |
Total level of expense less than or greater than amount of annual base level of expense |  | $ 38,200,000 |  |  |
OKLAHOMA [Member] | Maximum [Member] |  |  |  |  |
Vegetation management operation and maintenance expenses |  | 38,200,000 |  |  |
Regulatory asset |  | $ 7,500,000 |  |  |
Impact to Company [Member] |  |  |  |  |
Estimated Refund to SPP |  |  |  |  | 4,000,000
Customer Impact [Member] |  |  |  |  |
Estimated Refund to SPP |  |  |  |  | $ 10,000,000

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