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COMMITMENTS AND CONTINGENCIES - Guarantees and Obligations Narrative (Details) - USD ($)
Apr. 30, 2022
Mar. 31, 2022
Jan. 31, 2022
Dec. 31, 2021
Sep. 16, 2020
Loss Contingencies [Line Items]          
Fair value of guarantees   $ 7,000,000   $ 7,300,000  
Letter of Credit | South Fork Wind, LLC          
Loss Contingencies [Line Items]          
Amount outstanding under line of credit     $ 4,300,000    
Letter of Credit | Eversource Investment LLC          
Loss Contingencies [Line Items]          
Maximum borrowing capacity         $ 25,000,000
Subsequent Event | Letter of Credit | South Fork Wind, LLC          
Loss Contingencies [Line Items]          
Amount outstanding under line of credit $ 160,200,000