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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Contingency [Line Items] |  |  |
Income Before Income Tax Expense | $ 1,865,968 | $ 1,572,269 | $ 1,558,872
Statutory Federal Income Tax Expense at 21% | 391,900 | 330,200 | 327,400
Tax Effect of Differences: |  |  |
Depreciation | (17,100) | (18,100) | (11,100)
Investment Tax Credit Amortization | (2,600) | (2,800) | (3,700)
State Income Taxes, Net of Federal Impact | 75,900 | 54,400 | 44,900
Dividends on ESOP | (5,100) | (5,100) | (5,100)
Tax Asset Valuation Allowance/Reserve Adjustments | 51,600 | 44,600 | 33,400
Excess Stock Benefit | (2,100) | (4,000) | (6,600)
EDIT Amortization | (49,100) | (69,100) | (48,700)
Other, Net | 10,200 | 14,100 | 15,700
Income Tax Expense | $ 453,574 | $ 344,223 | $ 346,186
Effective Tax Rate | 24.30% | 21.90% | 22.20%
CL&P |  |  |
Income Tax Contingency [Line Items] |  |  |
Income Before Income Tax Expense | $ 704,118 | $ 532,998 | $ 607,636
Statutory Federal Income Tax Expense at 21% | 147,900 | 111,900 | 127,600
Tax Effect of Differences: |  |  |
Depreciation | (3,700) | (6,400) | 400
Investment Tax Credit Amortization | (500) | (600) | (700)
State Income Taxes, Net of Federal Impact | (6,600) | (4,600) | (1,200)
Tax Asset Valuation Allowance/Reserve Adjustments | 44,700 | 36,700 | 30,700
Excess Stock Benefit | (700) | (1,500) | (2,300)
EDIT Amortization | (9,200) | (9,800) | (9,000)
Other, Net | (700) | 5,600 | 4,200
Income Tax Expense | $ 171,198 | $ 131,273 | $ 149,702
Effective Tax Rate | 24.30% | 24.60% | 24.60%
NSTAR Electric |  |  |
Income Tax Contingency [Line Items] |  |  |
Income Before Income Tax Expense | $ 632,405 | $ 590,904 | $ 575,829
Statutory Federal Income Tax Expense at 21% | 132,800 | 124,100 | 120,900
Tax Effect of Differences: |  |  |
Depreciation | (4,200) | (3,400) | (3,700)
Investment Tax Credit Amortization | (1,700) | (1,700) | (2,600)
State Income Taxes, Net of Federal Impact | 40,300 | 37,500 | 36,000
Tax Asset Valuation Allowance/Reserve Adjustments | 0 | 0 | 0
Excess Stock Benefit | (800) | (1,400) | (2,300)
EDIT Amortization | (29,200) | (43,200) | (20,400)
Other, Net | 2,800 | 2,400 | 2,900
Income Tax Expense | $ 139,977 | $ 114,335 | $ 130,828
Effective Tax Rate | 22.10% | 19.30% | 22.70%
PSNH |  |  |
Income Tax Contingency [Line Items] |  |  |
Income Before Income Tax Expense | $ 222,884 | $ 189,771 | $ 178,992
Statutory Federal Income Tax Expense at 21% | 46,800 | 39,900 | 37,600
Tax Effect of Differences: |  |  |
Depreciation | 900 | (200) | (1,400)
Investment Tax Credit Amortization | 0 | 0 | 0
State Income Taxes, Net of Federal Impact | 12,500 | 8,900 | 9,800
Tax Asset Valuation Allowance/Reserve Adjustments | 0 | 0 | 0
Excess Stock Benefit | (300) | (500) | (800)
EDIT Amortization | (7,700) | (10,500) | (15,400)
Other, Net | (900) | 1,800 | 1,900
Income Tax Expense | $ 51,314 | $ 39,433 | $ 31,680
Effective Tax Rate | 23.00% | 20.80% | 17.70%

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