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Derivatives and Risk Management - Schedule of Energy Commodity Derivative Volumes (Details) MWh in Thousands, MMBTU in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023 MMBTU MWh	Dec. 31, 2022 MMBTU MWh
Purchase [Member] \| Physical [Member] \| Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one \| MWh	5	5
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	12,377	19,140
Year two \| MMBTU	14,810	533
Year three \| MMBTU	6,363	450
Year four \| MMBTU	1,660
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	33,810	79,253
Year two \| MMBTU	61,090	30,658
Year three \| MMBTU	14,130	4,895
Year four \| MMBTU	1,800
Sales [Member] \| Physical [Member] \| Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one \| MWh	74	136
Year two \| MWh	31	0
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	735	4,145
Year two \| MMBTU	1,370	1,370
Year three \| MMBTU	1,115	1,115
Year four \| MMBTU	0
Sales [Member] \| Financial [Member] \| Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one \| MWh	267	1,011
Year two \| MWh	400	0
Year three \| MWh	96	0
Year four \| MWh	0
Sales [Member] \| Financial [Member] \| Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one \| MMBTU	5,295	29,473
Year two \| MMBTU	11,965	9,668
Year three \| MMBTU	1,125	1,125
Year four \| MMBTU	0