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COMMITMENTS AND CONTINGENCIES - Guarantees and Indemnifications (Details)
$ in Millions
Sep. 30, 2022
USD ($)
Jan. 31, 2022
USD ($)
letterOfCredit
Sep. 16, 2020
USD ($)
Oct. 25, 2019
USD ($)
Guarantor Obligations [Line Items]        
Number of letters of credit | letterOfCredit   2    
Letter of Credit | Eversource Investment LLC        
Guarantor Obligations [Line Items]        
Maximum borrowing capacity     $ 25.0  
North East Offshore LLC        
Guarantor Obligations [Line Items]        
Ownership interest 50.00%      
Sunrise Wind LLC        
Guarantor Obligations [Line Items]        
Maximum exposure (up to) $ 461.9      
Ownership interest 50.00%      
Revolution Wind, LLC        
Guarantor Obligations [Line Items]        
Maximum exposure (up to) $ 542.1      
Ownership interest 50.00%      
South Fork Wind, LLC        
Guarantor Obligations [Line Items]        
Maximum exposure (up to) $ 206.6      
South Fork Wind, LLC | Letter 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 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) $ 759.6      
Construction-related purchase agreements with third-party contractors | Sunrise Wind LLC        
Guarantor Obligations [Line Items]        
Maximum exposure (up to) 288.1      
Construction-related purchase agreements with third-party contractors | Revolution Wind, LLC        
Guarantor Obligations [Line Items]        
Maximum exposure (up to) 419.0      
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC        
Guarantor Obligations [Line Items]        
Maximum exposure (up to) 142.7      
Funding and indemnification obligations of North East Offshore LLC | Eversource Investment LLC        
Guarantor Obligations [Line Items]        
Maximum exposure (up to) 94.8      
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      
Power Purchase Agreement | South Fork Wind, LLC | 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      
OREC capacity production | Sunrise Wind LLC | Sunrise Wind LLC        
Guarantor Obligations [Line Items]        
Maximum exposure (up to)       $ 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%