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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Contingency [Line Items] |  |  |
Income Before Income Tax Expense | $ 1,572,269 | $ 1,558,872 | $ 1,190,071
Statutory Federal Income Tax Expense at 21% | 330,200 | 327,400 | 249,900
Tax Effect of Differences: |  |  |
Depreciation | (18,100) | (11,100) | 1,900
Investment Tax Credit Amortization | (2,800) | (3,700) | (3,700)
State Income Taxes, Net of Federal Impact | 54,400 | 44,900 | 24,600
Dividends on ESOP | (5,100) | (5,100) | (5,100)
Tax Asset Valuation Allowance/Reserve Adjustments | 44,600 | 33,400 | 40,100
Excess Stock Benefit | (4,000) | (6,600) | (1,500)
EDIT Amortization | (69,100) | (48,700) | (37,400)
Other, Net | 14,100 | 15,700 | 4,700
Income Tax Expense | $ 344,223 | $ 346,186 | $ 273,499
Effective Tax Rate | 21.90% | 22.20% | 23.00%
The Connecticut Light and Power Company |  |  |
Income Tax Contingency [Line Items] |  |  |
Income Before Income Tax Expense | $ 532,998 | $ 607,636 | $ 547,823
Statutory Federal Income Tax Expense at 21% | 111,900 | 127,600 | 115,000
Tax Effect of Differences: |  |  |
Depreciation | (6,400) | 400 | (200)
Investment Tax Credit Amortization | (600) | (700) | (800)
State Income Taxes, Net of Federal Impact | (4,600) | (1,200) | 2,500
Tax Asset Valuation Allowance/Reserve Adjustments | 36,700 | 30,700 | 24,500
Excess Stock Benefit | (1,500) | (2,300) | (500)
EDIT Amortization | (9,800) | (9,000) | (5,800)
Other, Net | 5,600 | 4,200 | 2,300
Income Tax Expense | $ 131,273 | $ 149,702 | $ 136,971
Effective Tax Rate | 24.60% | 24.60% | 25.00%
NSTAR Electric Company |  |  |
Income Tax Contingency [Line Items] |  |  |
Income Before Income Tax Expense | $ 590,904 | $ 575,829 | $ 557,269
Statutory Federal Income Tax Expense at 21% | 124,100 | 120,900 | 117,000
Tax Effect of Differences: |  |  |
Depreciation | (3,400) | (3,700) | (3,000)
Investment Tax Credit Amortization | (1,700) | (2,600) | (2,600)
State Income Taxes, Net of Federal Impact | 37,500 | 36,000 | 35,700
Tax Asset Valuation Allowance/Reserve Adjustments | 0 | 0 | 0
Excess Stock Benefit | (1,400) | (2,300) | (500)
EDIT Amortization | (43,200) | (20,400) | (22,900)
Other, Net | 2,400 | 2,900 | 1,600
Income Tax Expense | $ 114,335 | $ 130,828 | $ 125,313
Effective Tax Rate | 19.30% | 22.70% | 22.50%
Public Service Company of New Hampshire |  |  |
Income Tax Contingency [Line Items] |  |  |
Income Before Income Tax Expense | $ 189,771 | $ 178,992 | $ 175,023
Statutory Federal Income Tax Expense at 21% | 39,900 | 37,600 | 36,800
Tax Effect of Differences: |  |  |
Depreciation | (200) | (1,400) | (800)
Investment Tax Credit Amortization | 0 | 0 | 0
State Income Taxes, Net of Federal Impact | 8,900 | 9,800 | 9,800
Tax Asset Valuation Allowance/Reserve Adjustments | 0 | 0 | 0
Excess Stock Benefit | (500) | (800) | (200)
EDIT Amortization | (10,500) | (15,400) | (4,000)
Other, Net | 1,800 | 1,900 | (600)
Income Tax Expense | $ 39,433 | $ 31,680 | $ 40,975
Effective Tax Rate | 20.80% | 17.70% | 23.40%

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