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NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Adjustments to Reconcile Net Income/(Loss) to Net Cash Flows Provided by Operating Activities:      
Depreciation $ 1,433,503 $ 1,305,840 $ 1,194,246
Deferred Income Taxes 435,889 85,405 346,779
Uncollectible Expense 74,069 72,468 61,876
Pension, SERP and PBOP Income, Net (73,564) (90,706) (160,857)
Pension Contributions (5,915) (6,860) (83,148)
Regulatory Under Recoveries, Net (919,359) (151,548) (205,294)
Cost of Removal Expenditures (294,984) (315,699) (303,755)
Payment in 2022 of Withheld Property Taxes 0 0 (78,446)
Other (102,450) (53,026) (39,192)
Changes in Current Assets and Liabilities:      
Receivables and Unbilled Revenues, Net (432,620) (124,393) (470,593)
Taxes Receivable/Accrued, Net 55,502 36,357 18,358
Accounts Payable 47,082 (287,637) 377,657
Other Current Assets and Liabilities, Net 19,529 (66,202) (45,583)
Net Cash Flows Provided by Operating Activities 2,159,737 1,646,161 2,401,293
Investing Activities:      
Investments in Property, Plant and Equipment (4,480,529) (4,336,849) (3,441,852)
Other Investing Activities (13,365) (2,897) 20,420
Net Cash Flows Used in Investing Activities (4,535,664) (4,870,732) (4,130,490)
Financing Activities:      
Cash Dividends on Common Shares (1,001,488) (918,995) (860,033)
Cash Dividends on Preferred Stock (7,519) (7,519) (7,519)
Increase (Decrease) in Notes Payable To Eversource Parent (94,959) 695,552 (78,170)
Issuance of Long-Term Debt 4,501,623 5,198,345 4,045,000
Retirement of Long-Term Debt (1,949,995) (2,008,470) (1,175,000)
Other Financing Activities (57,082) (46,466) (48,185)
Net Cash Flows Provided by Financing Activities 2,336,817 2,869,237 2,029,941
Net (Decrease)/Increase in Cash, Cash Equivalents and Restricted Cash (39,110) (355,334) 300,744
Cash, Cash Equivalents and Restricted Cash - Beginning of Year 166,418 521,752 221,008
Cash, Cash Equivalents and Restricted Cash - End of Year 127,308 166,418 521,752
NSTAR Electric      
Operating Activities:      
Net Income/(Loss) 636,353 544,528 492,428
Adjustments to Reconcile Net Income/(Loss) to Net Cash Flows Provided by Operating Activities:      
Depreciation 407,699 372,578 361,969
Deferred Income Taxes 111,177 96,224 78,039
Uncollectible Expense 33,607 22,791 21,550
Pension, SERP and PBOP Income, Net (36,104) (41,554) (55,830)
Pension Contributions 0 0 (15,000)
Regulatory Under Recoveries, Net (271,689) (141,865) (88,220)
Amortization of Regulatory Assets/(Liabilities), Net 130,869 16,150 83,855
Cost of Removal Expenditures (59,187) (68,290) (57,339)
Payment in 2022 of Withheld Property Taxes 0 0 (76,311)
Other (25,876) (2,123) (14,294)
Changes in Current Assets and Liabilities:      
Receivables and Unbilled Revenues, Net (179,783) (82,659) (23,757)
Taxes Receivable/Accrued, Net (37,779) 27,394 35,143
Accounts Payable 1,412 11,357 8,815
Other Current Assets and Liabilities, Net (23,137) (40,974) 20,430
Net Cash Flows Provided by Operating Activities 687,562 713,557 771,478
Investing Activities:      
Investments in Property, Plant and Equipment (1,563,326) (1,376,135) (954,281)
Other Investing Activities 0 48 165
Net Cash Flows Used in Investing Activities (1,563,326) (1,376,087) (954,116)
Financing Activities:      
Cash Dividends on Common Shares (643,900) (327,400) (287,600)
Cash Dividends on Preferred Stock (1,960) (1,960) (1,960)
Increase/(Decrease) in Notes Payable 138,935 365,847 (162,500)
Capital Contributions from Eversource Parent 775,000 234,900 525,000
Issuance of Long-Term Debt 600,000 150,000 850,000
Retirement of Long-Term Debt 0 (80,000) (400,000)
Other Financing Activities (6,073) (1,365) (13,188)
Net Cash Flows Provided by Financing Activities 862,002 340,022 509,752
Net (Decrease)/Increase in Cash, Cash Equivalents and Restricted Cash (13,762) (322,508) 327,114
Cash, Cash Equivalents and Restricted Cash - Beginning of Year 22,785 345,293 18,179
Cash, Cash Equivalents and Restricted Cash - End of Year $ 9,023 $ 22,785 $ 345,293