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COMMITMENTS AND CONTINGENCIES - Guarantees and Indemnifications (Details)
$ in Millions
Mar. 31, 2023
USD ($)
Jan. 31, 2022
USD ($)
letterOfCredit
Sep. 16, 2020
USD ($)
Guarantor Obligations [Line Items]      
Number of letters of credit | letterOfCredit   2  
Letters of Credit | Eversource Investment LLC      
Guarantor Obligations [Line Items]      
Maximum borrowing capacity     $ 25.0
North East Offshore LLC      
Guarantor Obligations [Line Items]      
Ownership interest (percent) 50.00%    
Sunrise Wind LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) $ 838.4    
Ownership interest (percent) 50.00%    
Revolution Wind, LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) $ 547.1    
Ownership interest (percent) 50.00%    
South Fork Wind, LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) $ 7.1    
Ownership interest (percent) 50.00%    
South Fork Wind, LLC | Letters of Credit      
Guarantor Obligations [Line Items]      
Amount outstanding under line of credit   $ 4.3  
Eversource Investment LLC | North East Offshore LLC      
Guarantor Obligations [Line Items]      
Ownership interest (percent) 50.00%    
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) $ 207.7    
Ownership interest (percent) 50.00%    
Construction-related purchase agreements with third-party contractors | North East Offshore LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) $ 726.2    
Construction-related purchase agreements with third-party contractors | Sunrise Wind LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) 668.6    
Construction-related purchase agreements with third-party contractors | Revolution Wind, LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) 409.7    
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) 126.2    
Funding and indemnification obligations of North East Offshore LLC | Eversource Investment LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) 68.9    
Funding and indemnification obligations of North East Offshore LLC | Eversource Investment LLC | North East Offshore LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) 910.0    
Power Purchase Agreement | South Fork Wind, LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) 7.1    
OREC capacity production | Sunrise Wind LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) $ 15.4    
Ownership interest (percent) 50.00%    
OREC capacity production | Sunrise Wind LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) $ 11.0    
Real estate purchase | Bay State Wind LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) 2.5    
Transmission interconnection | South Fork Wind, LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) 1.2    
Letters of Credit | Eversource Investment LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) 4.3    
Surety bonds | Various      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) 37.2    
Lease payments for real estate | Eversource Service      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) 0.4    
Performance guarantee | North East Offshore LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) $ 1,300.0    
Percent of obligations guaranteed 50.00%    
Payment guarantee | North East Offshore LLC      
Guarantor Obligations [Line Items]      
Maximum exposure (up to) $ 62.5    
Percent of obligations guaranteed 50.00%