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INCOME TAXES - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current Income Taxes:      
Federal $ (23,400) $ 75,800 $ 95,800
State 14,300 600 13,600
Total Current (9,100) 76,400 109,400
Deferred Income Taxes, Net:      
Federal 266,300 (900) 198,800
State 169,600 86,300 148,000
Total Deferred 435,889 85,405 346,779
Investment Tax Credits, Net (2,100) (2,100) (2,600)
Income Tax Expense 424,664 159,684 453,574
CL&P      
Current Income Taxes:      
Federal 25,900 (10,800) 106,200
State (6,800) (2,300) 20,100
Total Current 19,100 (13,100) 126,300
Deferred Income Taxes, Net:      
Federal 107,900 130,300 17,200
State 67,500 53,700 28,200
Total Deferred 175,424 184,037 45,381
Investment Tax Credits, Net 0 0 (500)
Income Tax Expense 194,459 170,909 171,198
NSTAR Electric      
Current Income Taxes:      
Federal 65,900 50,700 55,000
State 15,200 7,800 8,700
Total Current 81,100 58,500 63,700
Deferred Income Taxes, Net:      
Federal 63,900 50,100 35,600
State 47,300 46,100 42,400
Total Deferred 111,177 96,224 78,039
Investment Tax Credits, Net (1,700) (1,700) (1,700)
Income Tax Expense 190,576 152,996 139,977
PSNH      
Current Income Taxes:      
Federal (1,700) (40,000) 29,600
State (5,200) (20,000) 5,900
Total Current (6,900) (60,000) 35,500
Deferred Income Taxes, Net:      
Federal 50,800 81,200 5,900
State 26,300 37,800 9,900
Total Deferred 77,082 118,970 15,765
Investment Tax Credits, Net 0 0 0
Income Tax Expense $ 70,245 $ 59,014 $ 51,314