Electric Plant - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) Unit Facility mi MW	Dec. 31, 2022 USD ($)
Wildcat Point [Member]
Property, Plant and Equipment [Line Items]
Power facility output	980
North Anna [Member]
Property, Plant and Equipment [Line Items]
Power facility output	1,892
Undivided ownership interest	11.60%
Number of units | Unit	2
Percentage of costs responsible for	11.60%
Outstanding accounts payable balance | $	$ 12.8	$ 5.6
Clover [Member]
Property, Plant and Equipment [Line Items]
Power facility output	877
Undivided ownership interest	50.00%
Number of units | Unit	2
Outstanding accounts payable balance | $	$ 8.9	$ 6.0
Combustion Turbine Facilities [Member]
Property, Plant and Equipment [Line Items]
Number of combustion turbine facilities | Facility	2
Distributed Generation Facilities [Member]
Property, Plant and Equipment [Line Items]
Number of distributed facilities | Facility	6
Other [Member]
Property, Plant and Equipment [Line Items]
Transmission lines | mi	110