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INCOME TAXES - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current Income Taxes:      
Federal $ 21,500 $ 73,600 $ 56,900
State (21,600) 19,100 10,500
Total Current (100) 92,700 67,400
Deferred Income Taxes, Net:      
Federal 199,700 173,500 138,400
State 147,400 83,700 71,400
Total Deferred 347,056 257,154 209,812
Investment Tax Credits, Net (2,800) (3,700) (3,700)
Income Tax Expense 344,223 346,186 273,499
The Connecticut Light and Power Company      
Current Income Taxes:      
Federal 15,000 12,000 68,400
State (7,000) (6,100) 15,400
Total Current 8,000 5,900 83,800
Deferred Income Taxes, Net:      
Federal 76,300 101,100 35,200
State 47,600 43,400 18,800
Total Deferred 123,889 144,527 54,005
Investment Tax Credits, Net (600) (700) (800)
Income Tax Expense 131,273 149,702 136,971
NSTAR Electric Company      
Current Income Taxes:      
Federal 52,300 53,900 82,600
State 6,200 6,900 18,200
Total Current 58,500 60,800 100,800
Deferred Income Taxes, Net:      
Federal 16,300 33,800 100
State 41,200 38,800 27,000
Total Deferred 57,507 72,595 27,107
Investment Tax Credits, Net (1,700) (2,600) (2,600)
Income Tax Expense 114,335 130,828 125,313
Public Service Company of New Hampshire      
Current Income Taxes:      
Federal 43,100 20,600 22,900
State 10,800 3,800 2,200
Total Current 53,900 24,400 25,100
Deferred Income Taxes, Net:      
Federal (14,900) (1,300) 5,800
State 400 8,600 10,100
Total Deferred (14,530) 7,337 15,917
Investment Tax Credits, Net 0 0 0
Income Tax Expense $ 39,433 $ 31,680 $ 40,975