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NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating Revenues $ 11,900,809 $ 11,910,705 $ 12,289,336
Operating Expenses:      
Purchased Power and Transmission 3,736,078 5,168,241 5,014,074
Operations and Maintenance 2,012,926 1,895,703 1,865,328
Depreciation 1,433,503 1,305,840 1,194,246
Energy Efficiency Programs 671,828 691,344 658,051
Taxes Other Than Income Taxes 997,901 940,359 910,591
Total Operating Expenses 9,492,100 9,511,370 10,091,182
Operating Income 2,408,709 2,399,335 2,198,154
Interest Expense 1,111,336 855,441 678,274
Other Income, Net 410,482 348,069 346,088
Income/(Loss) Before Income Tax Expense 1,243,836 (275,037) 1,865,968
Income Tax Expense 424,664 159,684 453,574
NSTAR Electric Company      
Operating Revenues 3,720,877 3,515,539 3,583,070
Operating Expenses:      
Purchased Power and Transmission 1,045,306 1,154,013 1,264,824
Operations and Maintenance 735,019 668,466 640,834
Depreciation 407,699 372,578 361,969
Amortization of Regulatory Assets/(Liabilities), Net 130,869 16,150 83,855
Energy Efficiency Programs 263,405 325,593 332,247
Taxes Other Than Income Taxes 280,261 256,090 246,705
Total Operating Expenses 2,862,559 2,792,890 2,930,434
Operating Income 858,318 722,649 652,636
Interest Expense 222,794 189,254 162,892
Other Income, Net 191,405 164,129 142,661
Income/(Loss) Before Income Tax Expense 826,929 697,524 632,405
Income Tax Expense 190,576 152,996 139,977
Net Income/(Loss) $ 636,353 $ 544,528 $ 492,428