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INCOME TAXES - Reconciliation Between Income Tax Expense and Expected Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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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%

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