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Rate Matters and Regulation - Additional Information (Details) $ in Millions			6 Months Ended
	Jul. 12, 2023 USD ($) Turbine Megawattsday	May 31, 2023 USD ($) Megawattsday Turbine	Jun. 30, 2023 USD ($)
Estimated Refund to SPP			$ 13.0
ARKANSAS [Member]
Public Utilities, Requested Rate Increase (Decrease), Amount			9.6
Horseshoe Lake [Member]
Number of hydrogen capable combustion turbines | Turbine		2
Current energy generation capacity | Megawattsday		448
Approximate construction cost of turbines excluding financing costs and property taxes		$ 331.0
Horseshoe Lake [Member] | Subsequent Event [Member]
Number of hydrogen capable combustion turbines | Turbine	2
Current energy generation capacity | Megawattsday	448
Approximate construction cost of turbines excluding financing costs and property taxes	$ 331.0
Impact to Company [Member]
Estimated Refund to SPP			5.0
Customer Impact [Member]
Estimated Refund to SPP			$ 8.0

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Amount of public utility's requested rate increase (decrease) with regulatory agency.

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