XML 110 R89.htm IDEA: XBRL DOCUMENT v3.24.1.u1
COMMITMENTS AND CONTINGENCIES - Schedule of Guarantees and Indemnifications (Details)
$ in Millions
Mar. 31, 2024
USD ($)
bond
Jan. 24, 2024
Dec. 31, 2023
USD ($)
Guarantor Obligations [Line Items]      
Maximum exposure guarantee $ 2.6   $ 4.4
Eversource Investment LLC | Letters of Credit      
Guarantor Obligations [Line Items]      
Maximum Exposure 23.2    
Maximum borrowing capacity $ 25.0    
North East Offshore, LLC, Sunrise Wind LLC, Revolution Wind, LLC and South Fork Wind, LLC      
Guarantor Obligations [Line Items]      
Ownership interest (percent) 50.00%    
Sunrise Wind LLC      
Guarantor Obligations [Line Items]      
Ownership interest (percent)   50.00%  
South Fork Wind, LLC      
Guarantor Obligations [Line Items]      
Maximum Exposure $ 7.1    
Ownership interest (percent) 50.00%    
Eversource Investment LLC and South Fork Class B Member, LLC      
Guarantor Obligations [Line Items]      
Maximum Exposure $ 1,520.0    
South Fork Class B Member, LLC      
Guarantor Obligations [Line Items]      
Ownership interest (percent) 50.00%    
OREC capacity production | Sunrise Wind LLC      
Guarantor Obligations [Line Items]      
Maximum Exposure $ 15.4    
Ownership interest (percent) 50.00%    
Tax Equity | Eversource TEI LLC      
Guarantor Obligations [Line Items]      
Maximum Exposure $ 50.0    
North East Offshore, LLC, Sunrise Wind LLC, Revolution Wind, LLC and South Fork Wind, LLC | Construction-related purchase agreements with third-party contractors      
Guarantor Obligations [Line Items]      
Maximum Exposure 1,824.3    
North East Offshore, LLC, Sunrise Wind LLC, Revolution Wind, LLC and South Fork Wind, LLC | Performance Guarantee      
Guarantor Obligations [Line Items]      
Maximum Exposure 3,020.0    
Eversource Investment LLC and South Fork Class B Member, LLC | Funding and indemnification obligations of North East Offshore LLC      
Guarantor Obligations [Line Items]      
Maximum Exposure 458.5    
Sunrise Wind LLC | OREC capacity production      
Guarantor Obligations [Line Items]      
Maximum Exposure 15.4    
Sunrise Wind LLC | Surety Bond      
Guarantor Obligations [Line Items]      
Maximum Exposure $ 48.2    
Number of surety bonds expiring before full performance completed | bond 1    
South Fork Wind, LLC | Power Purchase Guarantee      
Guarantor Obligations [Line Items]      
Maximum Exposure $ 7.1    
Eversource Investment LLC | Letters Of Credit Guarantee      
Guarantor Obligations [Line Items]      
Maximum Exposure 23.2    
Eversource TEI LLC | South Fork Wind Tax Equity      
Guarantor Obligations [Line Items]      
Maximum Exposure 50.0    
Various Eversource subsidiaries | Surety Bond      
Guarantor Obligations [Line Items]      
Maximum Exposure 38.8    
North East Offshore LLC | Payment Guarantee      
Guarantor Obligations [Line Items]      
Maximum Exposure $ 62.5    
Percent of obligations guaranteed (in percent) 50.00%