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COMMITMENTS AND CONTINGENCIES - Schedule of Guarantees and Indemnifications (Details) - USD ($)
Mar. 31, 2022
Jan. 31, 2022
Dec. 31, 2021
Oct. 25, 2019
Guarantor Obligations [Line Items]        
Fair value of guarantees     $ 7,300,000  
North East Offshore LLC        
Guarantor Obligations [Line Items]        
Ownership interest     50.00%  
Sunrise Wind LLC        
Guarantor Obligations [Line Items]        
Maximum Exposure     $ 420,600,000 $ 15,400,000
Ownership interest     50.00% 50.00%
Revolution Wind, LLC        
Guarantor Obligations [Line Items]        
Maximum Exposure     $ 158,900,000  
Ownership interest     50.00%  
Construction-related Purchase Contracts with Third-Party Suppliers | South Fork Wind, LLC        
Guarantor Obligations [Line Items]        
Ownership interest     50.00%  
North East Offshore LLC | Construction-related Purchase Contracts with Third-Party Suppliers        
Guarantor Obligations [Line Items]        
Maximum Exposure     $ 1,080,600,000  
North East Offshore LLC | Performance Guarantee        
Guarantor Obligations [Line Items]        
Maximum Exposure     $ 1,300,000,000  
Percent of obligations guaranteed     50.00%  
North East Offshore LLC | Payment Guarantee        
Guarantor Obligations [Line Items]        
Maximum Exposure     $ 62,500,000  
Percent of obligations guaranteed     50.00%  
Sunrise Wind LLC | Construction-related Purchase Contracts with Third-Party Suppliers        
Guarantor Obligations [Line Items]        
Maximum Exposure     $ 382,300,000  
Sunrise Wind LLC | OREC Capacity Production        
Guarantor Obligations [Line Items]        
Maximum Exposure     2,200,000  
Revolution Wind, LLC | Construction-related Purchase Contracts with Third-Party Suppliers        
Guarantor Obligations [Line Items]        
Maximum Exposure     150,900,000  
South Fork Wind, LLC | Letter of Credit | Subsequent Event        
Guarantor Obligations [Line Items]        
Borrowings outstanding $ 43,400,000 $ 4,300,000    
South Fork Wind, LLC | Construction-related Purchase Contracts with Third-Party Suppliers        
Guarantor Obligations [Line Items]        
Maximum Exposure     137,200,000  
South Fork Wind, LLC | Transmission Interconnection        
Guarantor Obligations [Line Items]        
Maximum Exposure     1,200,000  
South Fork Wind, LLC | Purchase Guarantee Expiring 2026        
Guarantor Obligations [Line Items]        
Maximum Exposure     $ 125,200,000  
Eversource Investment LLC | North East Offshore LLC        
Guarantor Obligations [Line Items]        
Ownership interest     50.00%  
Eversource Investment LLC | Funding and Indemnification Obligations        
Guarantor Obligations [Line Items]        
Maximum Exposure     $ 0  
Eversource Investment LLC | Funding and Indemnification Obligations | North East Offshore LLC        
Guarantor Obligations [Line Items]        
Maximum Exposure     910,000,000  
Bay State Wind LLC | Real Estate Purchase        
Guarantor Obligations [Line Items]        
Maximum Exposure     2,500,000  
Various | Surety Bonds        
Guarantor Obligations [Line Items]        
Maximum Exposure     54,700,000  
Eversource Service | Lease Payments for Real Estate        
Guarantor Obligations [Line Items]        
Maximum Exposure     $ 800,000