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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, 2025 MMBTU MWh	Dec. 31, 2024 MMBTU MWh
Purchase [Member] | Physical [Member] | Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one | MWh	3	7
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	12,918	27,993
Year two | MMBTU	26,651	17,560
Year three | MMBTU	13,110	7,555
Year four | MMBTU	1,820
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	9,990	39,483
Year two | MMBTU	23,633	13,175
Year three | MMBTU	11,403	2,250
Year four | MMBTU	4,483
Sales [Member] | Physical [Member] | Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one | MWh	157	427
Year two | MWh	364	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	570	1,897
Year two | MMBTU	1,393	0
Year three | MMBTU	1,393	0
Year four | MMBTU	1,013
Sales [Member] | Financial [Member] | Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one | MWh	116	420
Year two | MWh	316	0
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	155	1,963
Year two | MMBTU	0	0
Year three | MMBTU	0	0
Year four | MMBTU	0

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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