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, 2022 MWh MMBTU	Dec. 31, 2021 MWh MMBTU
Purchase [Member] | Physical [Member] | Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one | MWh	93	129
Year two | MWh	0	0
Year three | MWh	0	0
Year four | MWh	0	0
Purchase [Member] | Physical [Member] | Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one | MMBTU	5,225	7,114
Year two | MMBTU	603	378
Year three | MMBTU	380	228
Year four | MMBTU	225	0
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	0
Purchase [Member] | Financial [Member] | Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one | MMBTU	46,743	61,405
Year two | MMBTU	37,935	23,218
Year three | MMBTU	6,690	3,413
Year four | MMBTU	0	0
Sales [Member] | Physical [Member] | Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one | MWh	202	234
Year two | MWh	0	0
Year three | MWh	0	0
Year four | MWh	0	0
Sales [Member] | Physical [Member] | Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one | MMBTU	5,676	3,933
Year two | MMBTU	1,360	1,360
Year three | MMBTU	1,370	1,370
Year four | MMBTU	1,115	1,115
Sales [Member] | Financial [Member] | Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one | MWh	671	452
Year two | MWh	216	0
Year three | MWh	0	0
Year four | MWh	0	0
Sales [Member] | Financial [Member] | Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
Year one | MMBTU	22,843	31,485
Year two | MMBTU	13,920	9,323
Year three | MMBTU	1,525	228
Year four | MMBTU	0	0