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REGULATORY ACCOUNTING - Components of Regulatory Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities $ 4,664,900 $ 4,614,700
Less:  Current Portion 632,282 591,750
Total Long-Term Regulatory Liabilities 4,032,564 4,022,923
EDIT due to Tax Cuts and Jobs Act of 2017    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 2,442,700 2,548,600
Regulatory Tracking Mechanisms    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 702,400 668,300
Cost of Removal    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 684,100 666,600
Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 427,100 354,000
AFUDC - Transmission    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 154,800 124,300
Benefit Costs    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 69,300 51,000
Other Regulatory Liabilities    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 184,500 201,900
CL&P    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 1,520,000 1,418,100
Less:  Current Portion 124,122 102,239
Total Long-Term Regulatory Liabilities 1,395,883 1,315,928
CL&P | EDIT due to Tax Cuts and Jobs Act of 2017    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 956,600 969,200
CL&P | Regulatory Tracking Mechanisms    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 180,300 154,000
CL&P | Cost of Removal    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 212,800 157,900
CL&P | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 61,600 49,900
CL&P | AFUDC - Transmission    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 65,100 56,100
CL&P | Benefit Costs    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 4,500 600
CL&P | Other Regulatory Liabilities    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 39,100 30,400
NSTAR Electric    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 2,079,400 1,953,400
Less:  Current Portion 436,312 368,070
Total Long-Term Regulatory Liabilities 1,643,079 1,585,311
NSTAR Electric | EDIT due to Tax Cuts and Jobs Act of 2017    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 877,600 905,100
NSTAR Electric | Regulatory Tracking Mechanisms    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 413,600 347,200
NSTAR Electric | Cost of Removal    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 451,300 420,900
NSTAR Electric | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 211,600 175,900
NSTAR Electric | AFUDC - Transmission    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 89,700 68,200
NSTAR Electric | Benefit Costs    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 21,400 22,200
NSTAR Electric | Other Regulatory Liabilities    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 14,200 13,900
PSNH    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 516,100 511,100
Less:  Current Portion 121,058 117,515
Total Long-Term Regulatory Liabilities 394,982 393,574
PSNH | EDIT due to Tax Cuts and Jobs Act of 2017    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 330,600 339,300
PSNH | Regulatory Tracking Mechanisms    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 114,400 114,400
PSNH | Cost of Removal    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 20,100 16,200
PSNH | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 42,600 36,600
PSNH | AFUDC - Transmission    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 0 0
PSNH | Benefit Costs    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities 3,900 0
PSNH | Other Regulatory Liabilities    
Regulatory Liabilities [Line Items]    
Total Regulatory Liabilities $ 4,500 $ 4,600