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v3.23.3

Rate Matters and Regulation - Additional Information (Details) |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 02, 2023 USD ($) | Jul. 12, 2023 USD ($) Megawattsday Turbine | May 31, 2023 USD ($) Megawattsday Turbine | Sep. 30, 2023 USD ($) | Nov. 01, 2023 USD ($)
Estimated Refund to SPP |  |  |  | $ 13,000,000 |
Subsequent Event [Member] | Settlement Agreement [Member] |  |  |  |  |
Approximate deduction in average monthly residential bill expected |  |  |  |  | $ 21
ARKANSAS [Member] |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  | 9,600,000 |
ARKANSAS [Member] | Subsequent Event [Member] |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 4,700,000 |  |  |  |
Horseshoe Lake [Member] |  |  |  |  |
Number of hydrogen capable combustion turbines | Turbine |  | 2 | 2 |  |
Current energy generation capacity | Megawattsday |  | 448 | 448 |  |
Approximate construction cost of turbines excluding financing costs and property taxes |  | $ 331,000,000 | $ 331,000,000 |  |
Impact to Company [Member] |  |  |  |  |
Estimated Refund to SPP |  |  |  | 5,000,000 |
Customer Impact [Member] |  |  |  |  |
Estimated Refund to SPP |  |  |  | $ 8,000,000 |

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