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Commitments and Contingencies - Additional Information (Details) $ in Millions				1 Months Ended	3 Months Ended
	Sep. 14, 2020 USD ($) item	Jun. 28, 2020 USD ($)	Apr. 27, 2020 USD ($)	Oct. 31, 2020 USD ($)	Jan. 31, 2022 USD ($) project MW	Dec. 20, 2021 USD ($)
Commitments And Contingencies [Line Items]
Recorded unconditional purchase obligation					$ 85.4
Loss contingency, damages sought				$ 880.0
Total number of projects | project					3
Accounts receivable outstanding					$ 11.2
POSCO Energy Settlement Agreement
Commitments And Contingencies [Line Items]
Unspecified warranty claims	$ 1.0
Contingent liability						$ 1.8
Number of counts | item	4
Tulare Biomart Project
Commitments And Contingencies [Line Items]
Term for procuring fuel					20 years
LIPA project
Commitments And Contingencies [Line Items]
Term for procuring fuel					7 years
LIPA project | Maximum
Commitments And Contingencies [Line Items]
Term for procuring fuel					20 years
CT-RFP 2 Derby 14.9 Mega Watt Project
Commitments And Contingencies [Line Items]
Under construction power plant capacity | MW					14.0
SCEF-Derby 208 Mega Watt Project
Commitments And Contingencies [Line Items]
Under construction power plant capacity | MW					2.8
Bridgeport
Commitments And Contingencies [Line Items]
Operating power plant capacity | MW					14.9
Hartford
Commitments And Contingencies [Line Items]
Operating power plant capacity | MW					7.4
Posco Energy
Commitments And Contingencies [Line Items]
Loss contingency, damages sought		$ 200.0	$ 3.3
Unspecified warranty claims			$7
License termination			$ 110.0
Bond amount					$ 46.0

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