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NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Operating Revenues $ 4,118,355 $ 3,332,575
Operating Expenses:    
Purchased Power and Transmission 1,340,337 1,235,956
Operations and Maintenance 487,451 462,964
Depreciation 379,579 339,914
Energy Efficiency Programs 257,550 213,479
Taxes Other Than Income Taxes 271,595 236,614
Total Operating Expenses 3,191,961 2,486,602
Operating Income/(Loss) 926,394 845,973
Interest Expense 300,849 250,749
Other Income, Net 92,344 91,030
Income Before Income Tax Expense 717,889 686,254
Income Tax Expense 165,221 162,526
NSTAR Electric Company    
Operating Revenues 1,014,227 947,615
Operating Expenses:    
Purchased Power and Transmission 308,946 273,305
Operations and Maintenance 174,137 173,672
Depreciation 108,014 96,922
Amortization of Regulatory Assets, Net 52,284 48,392
Energy Efficiency Programs 63,438 82,301
Taxes Other Than Income Taxes 75,839 60,010
Total Operating Expenses 782,658 734,602
Operating Income/(Loss) 231,569 213,013
Interest Expense 59,220 49,423
Other Income, Net 46,292 47,114
Income Before Income Tax Expense 218,641 210,704
Income Tax Expense 51,466 50,727
Net Income $ 167,175 $ 159,977