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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Contingency [Line Items] |  |  |
(Loss)/Income Before Income Tax Benefit | $ (275,037) | $ 1,865,968 | $ 1,572,269
Statutory Federal Income Tax Expense at 21% | (57,700) | 391,900 | 330,200
Tax Effect of Differences: |  |  |
Depreciation | (25,800) | (17,100) | (18,100)
Investment Tax Credit Amortization | (2,100) | (2,600) | (2,800)
State Income Taxes, Net of Federal Impact | (11,400) | 75,900 | 54,400
Dividends on ESOP | (5,300) | (5,100) | (5,100)
Tax Asset Valuation Allowance/Reserve Adjustments | 295,800 | 51,600 | 44,600
Tax Deficiency/(Excess Stock Benefit) | 500 | (2,100) | (4,000)
EDIT Amortization | (51,500) | (49,100) | (69,100)
Other, Net | 17,200 | 10,200 | 14,100
Income Tax Expense | $ 159,684 | $ 453,574 | $ 344,223
Effective Tax Rate | (58.10%) | 24.30% | 21.90%
CL&P |  |  |
Income Tax Contingency [Line Items] |  |  |
(Loss)/Income Before Income Tax Benefit | $ 689,642 | $ 704,118 | $ 532,998
Statutory Federal Income Tax Expense at 21% | 144,900 | 147,900 | 111,900
Tax Effect of Differences: |  |  |
Depreciation | (5,600) | (3,700) | (6,400)
Investment Tax Credit Amortization | 0 | (500) | (600)
State Income Taxes, Net of Federal Impact | (10,700) | (6,600) | (4,600)
Tax Asset Valuation Allowance/Reserve Adjustments | 51,300 | 44,700 | 36,700
Tax Deficiency/(Excess Stock Benefit) | 200 | (700) | (1,500)
EDIT Amortization | (10,500) | (9,200) | (9,800)
Other, Net | 1,300 | (700) | 5,600
Income Tax Expense | $ 170,909 | $ 171,198 | $ 131,273
Effective Tax Rate | 24.80% | 24.30% | 24.60%
NSTAR Electric |  |  |
Income Tax Contingency [Line Items] |  |  |
(Loss)/Income Before Income Tax Benefit | $ 697,524 | $ 632,405 | $ 590,904
Statutory Federal Income Tax Expense at 21% | 146,500 | 132,800 | 124,100
Tax Effect of Differences: |  |  |
Depreciation | (8,800) | (4,200) | (3,400)
Investment Tax Credit Amortization | (1,700) | (1,700) | (1,700)
State Income Taxes, Net of Federal Impact | 42,500 | 40,300 | 37,500
Tax Asset Valuation Allowance/Reserve Adjustments | 0 | 0 | 0
Tax Deficiency/(Excess Stock Benefit) | 200 | (800) | (1,400)
EDIT Amortization | (28,400) | (29,200) | (43,200)
Other, Net | 2,700 | 2,800 | 2,400
Income Tax Expense | $ 152,996 | $ 139,977 | $ 114,335
Effective Tax Rate | 21.90% | 22.10% | 19.30%
PSNH |  |  |
Income Tax Contingency [Line Items] |  |  |
(Loss)/Income Before Income Tax Benefit | $ 254,673 | $ 222,884 | $ 189,771
Statutory Federal Income Tax Expense at 21% | 53,500 | 46,800 | 39,900
Tax Effect of Differences: |  |  |
Depreciation | (1,000) | 900 | (200)
Investment Tax Credit Amortization | 0 | 0 | 0
State Income Taxes, Net of Federal Impact | 14,100 | 12,500 | 8,900
Tax Asset Valuation Allowance/Reserve Adjustments | 0 | 0 | 0
Tax Deficiency/(Excess Stock Benefit) | 100 | (300) | (500)
EDIT Amortization | (6,800) | (7,700) | (10,500)
Other, Net | (900) | (900) | 1,800
Income Tax Expense | $ 59,014 | $ 51,314 | $ 39,433
Effective Tax Rate | 23.20% | 23.00% | 20.80%

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