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INCOME TAXES - Reconciliation Between Income Tax Expense and Expected Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Contingency [Line Items]      
Income/(Loss) Before Income Tax Benefit $ 1,243,836 $ (275,037) $ 1,865,968
Statutory Federal Income Tax Expense at 21% 261,200 (57,700) 391,900
Tax Effect of Differences:      
Depreciation (22,600) (25,800) (17,100)
Investment Tax Credit Amortization (2,100) (2,100) (2,600)
Other Federal Tax Credits 67,000 42,500 0
State Income Taxes, Net of Federal Impact 43,200 (11,400) 75,900
Dividends on ESOP (5,500) (5,300) (5,100)
Tax Asset Valuation   Allowance/Reserve Adjustments 278,600 295,800 51,600
Tax Deficiency/(Excess Stock Benefit) 2,300 500 (2,100)
EDIT Amortization (37,000) (51,500) (49,100)
Other, Net (26,400) 59,700 10,200
Income Tax Expense $ 424,664 $ 159,684 $ 453,574
Effective Tax Rate 34.10% (58.10%) 24.30%
CL&P      
Income Tax Contingency [Line Items]      
Income/(Loss) Before Income Tax Benefit $ 707,057 $ 689,642 $ 704,118
Statutory Federal Income Tax Expense at 21% 148,500 144,900 147,900
Tax Effect of Differences:      
Depreciation 400 (5,600) (3,700)
Investment Tax Credit Amortization 0 0 (500)
State Income Taxes, Net of Federal Impact (2,800) (10,700) (6,600)
Tax Asset Valuation   Allowance/Reserve Adjustments 50,800 51,300 44,700
Tax Deficiency/(Excess Stock Benefit) 800 200 (700)
EDIT Amortization (9,200) (10,500) (9,200)
Other, Net 6,000 1,300 (700)
Income Tax Expense $ 194,459 $ 170,909 $ 171,198
Effective Tax Rate 27.50% 24.80% 24.30%
NSTAR Electric      
Income Tax Contingency [Line Items]      
Income/(Loss) Before Income Tax Benefit $ 826,929 $ 697,524 $ 632,405
Statutory Federal Income Tax Expense at 21% 173,700 146,500 132,800
Tax Effect of Differences:      
Depreciation (10,900) (8,800) (4,200)
Investment Tax Credit Amortization (1,700) (1,700) (1,700)
State Income Taxes, Net of Federal Impact 49,400 42,500 40,300
Tax Asset Valuation   Allowance/Reserve Adjustments 0 0 0
Tax Deficiency/(Excess Stock Benefit) 800 200 (800)
EDIT Amortization (20,000) (28,400) (29,200)
Other, Net (700) 2,700 2,800
Income Tax Expense $ 190,576 $ 152,996 $ 139,977
Effective Tax Rate 23.00% 21.90% 22.10%
PSNH      
Income Tax Contingency [Line Items]      
Income/(Loss) Before Income Tax Benefit $ 285,128 $ 254,673 $ 222,884
Statutory Federal Income Tax Expense at 21% 59,900 53,500 46,800
Tax Effect of Differences:      
Depreciation (1,000) (1,000) 900
Investment Tax Credit Amortization 0 0 0
State Income Taxes, Net of Federal Impact 16,700 14,100 12,500
Tax Asset Valuation   Allowance/Reserve Adjustments 0 0 0
Tax Deficiency/(Excess Stock Benefit) 300 100 (300)
EDIT Amortization (6,500) (6,800) (7,700)
Other, Net 800 (900) (900)
Income Tax Expense $ 70,245 $ 59,014 $ 51,314
Effective Tax Rate 24.60% 23.20% 23.00%