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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash as reported on the Balance Sheets $ 26,700 $ 53,900    
Cash and Restricted Cash as reported on the Statements of Cash Flows 127,308 166,418 $ 521,752 $ 221,008
CL&P        
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash as reported on the Balance Sheets 1,100 10,200    
Cash and Restricted Cash as reported on the Statements of Cash Flows 2,109 12,243 20,327 74,788
NSTAR Electric        
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash as reported on the Balance Sheets 900 6,700    
Cash and Restricted Cash as reported on the Statements of Cash Flows 9,023 22,785 345,293 18,179
PSNH        
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash as reported on the Balance Sheets 1,400 200    
Cash and Restricted Cash as reported on the Statements of Cash Flows 37,243 35,004 $ 36,812 $ 35,126
Special Deposits        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 75,800 81,500    
Special Deposits | CL&P        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 1,000 2,000    
Special Deposits | NSTAR Electric        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 8,100 16,100    
Special Deposits | PSNH        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 32,700 31,600    
Assets Held for Sale, Current        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 5,800 0    
Assets Held for Sale, Current | CL&P        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 0 0    
Assets Held for Sale, Current | NSTAR Electric        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 0 0    
Assets Held for Sale, Current | PSNH        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 0 0    
Marketable Securities        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 10,000 13,700    
Marketable Securities | CL&P        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 0 0    
Marketable Securities | NSTAR Electric        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 0 0    
Marketable Securities | PSNH        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 0 0    
Other Long-Term Assets        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 9,000 17,300    
Other Long-Term Assets | CL&P        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 0 0    
Other Long-Term Assets | NSTAR Electric        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 0 0    
Other Long-Term Assets | PSNH        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash $ 3,100 $ 3,200