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Derivatives and Risk Management - Schedule of Energy Commodity Derivative Volumes (Details) MWh in Thousands, MMBTU in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024 MWh MMBTU	Dec. 31, 2023 MWh MMBTU
Purchase [Member] \| Physical [Member] \| Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one \| MWh	10	9
Year two \| MWh	0	0
Year three \| MWh	0	0
Year four \| MWh	0
Purchase [Member] \| Physical [Member] \| Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one \| MMBTU	17,165	22,747
Year two \| MMBTU	16,660	12,505
Year three \| MMBTU	8,150	5,570
Year four \| MMBTU	900
Purchase [Member] \| Financial [Member] \| Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one \| MWh	0	0
Year two \| MWh	0	0
Year three \| MWh	0	0
Year four \| MWh	0
Purchase [Member] \| Financial [Member] \| Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one \| MMBTU	35,513	74,596
Year two \| MMBTU	19,895	19,590
Year three \| MMBTU	5,765	3,940
Year four \| MMBTU	450
Sales [Member] \| Physical [Member] \| Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one \| MWh	211	472
Year two \| MWh	11	11
Year three \| MWh	0	0
Year four \| MWh	0
Sales [Member] \| Physical [Member] \| Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one \| MMBTU	395	1,723
Year two \| MMBTU	1,115	1,115
Year three \| MMBTU	0	0
Year four \| MMBTU	0
Sales [Member] \| Financial [Member] \| Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one \| MWh	308	510
Year two \| MWh	96	96
Year three \| MWh	0	0
Year four \| MWh	0
Sales [Member] \| Financial [Member] \| Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one \| MMBTU	6,878	12,038
Year two \| MMBTU	1,125	1,125
Year three \| MMBTU	0	0
Year four \| MMBTU	0