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COMMITMENTS AND CONTINGENCIES - Guarantees and Indemnifications (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Oct. 25, 2019
North East Offshore LLC    
Guarantor Obligations [Line Items]    
Ownership interest 50.00%  
Sunrise Wind LLC    
Guarantor Obligations [Line Items]    
Maximum exposure (up to) $ 464.7  
Ownership interest 50.00%  
Revolution Wind, LLC    
Guarantor Obligations [Line Items]    
Maximum exposure (up to) $ 409.3  
Ownership interest 50.00%  
South Fork Wind, LLC    
Guarantor Obligations [Line Items]    
Maximum exposure (up to) $ 207.1  
Eversource Investment LLC | North East Offshore LLC    
Guarantor Obligations [Line Items]    
Ownership interest 50.00%  
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC    
Guarantor Obligations [Line Items]    
Ownership interest 50.00%  
Construction-related purchase agreements with third-party contractors | North East Offshore LLC    
Guarantor Obligations [Line Items]    
Maximum exposure (up to) $ 889.9  
Construction-related purchase agreements with third-party contractors | Sunrise Wind LLC    
Guarantor Obligations [Line Items]    
Maximum exposure (up to) 353.9  
Construction-related purchase agreements with third-party contractors | Revolution Wind, LLC    
Guarantor Obligations [Line Items]    
Maximum exposure (up to) 353.8  
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC    
Guarantor Obligations [Line Items]    
Maximum exposure (up to) 165.1  
Funding and indemnification obligations of North East Offshore LLC | Eversource Investment LLC    
Guarantor Obligations [Line Items]    
Maximum exposure (up to) 100.9  
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  
Ownership interest 50.00%  
OREC capacity production | Sunrise Wind LLC    
Guarantor Obligations [Line Items]    
Maximum exposure (up to) $ 2.2 $ 15.4
Ownership interest 50.00%  
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  
Letter 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) 35.7  
Lease payments for real estate | Eversource Service    
Guarantor Obligations [Line Items]    
Maximum exposure (up to) 0.6  
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%