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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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