NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Adjustments to Reconcile Net Income/(Loss) to Net Cash Flows Provided by Operating Activities:
Depreciation	$ 1,568,578	$ 1,433,503	$ 1,305,840
Deferred Income Taxes	27,313	435,889	85,405
Uncollectible Expense	101,141	74,069	72,468
Pension, SERP and PBOP Income, Net	(80,628)	(73,564)	(90,706)
Regulatory Over/(Under) Recoveries, Net	13,062	(919,359)	(151,548)
Cost of Removal Expenditures	(275,906)	(294,984)	(315,699)
Other	(4,826)	(108,365)	(59,886)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(364,156)	(432,620)	(124,393)
Taxes Receivable/Accrued, Net	143,331	55,502	36,357
Accounts Payable	84,192	47,082	(287,637)
Other Current Assets and Liabilities, Net	81,671	19,529	(66,202)
Net Cash Flows Provided by Operating Activities	4,113,572	2,159,737	1,646,161
Investing Activities:
Investments in Property, Plant and Equipment	(4,158,669)	(4,480,529)	(4,336,849)
Other Investing Activities	30,820	(13,365)	(2,897)
Net Cash Flows Used in Investing Activities	(4,306,163)	(4,535,664)	(4,870,732)
Financing Activities:
Cash Dividends on Common Shares	(1,093,074)	(1,001,488)	(918,995)
Cash Dividends on Preferred Stock	(7,519)	(7,519)	(7,519)
(Decrease)/Increase in Notes Payable	(517,348)	(94,959)	695,552
Issuance of Long-Term Debt	2,942,353	4,501,623	5,198,345
Retirement of Long-Term Debt	(1,400,331)	(1,949,995)	(2,008,470)
Other Financing Activities	(34,732)	(57,082)	(46,466)
Net Cash Flows Provided by Financing Activities	311,528	2,336,817	2,869,237
Net Increase/(Decrease) in Cash and Restricted Cash	118,937	(39,110)	(355,334)
Cash and Restricted Cash - Beginning of Year	127,308	166,418	521,752
Cash and Restricted Cash - End of Year	246,245	127,308	166,418
NSTAR Electric
Operating Activities:
Net Income/(Loss)	630,623	636,353	544,528
Adjustments to Reconcile Net Income/(Loss) to Net Cash Flows Provided by Operating Activities:
Depreciation	446,045	407,699	372,578
Deferred Income Taxes	35,596	111,177	96,224
Uncollectible Expense	41,430	33,607	22,791
Pension, SERP and PBOP Income, Net	(39,526)	(36,104)	(41,554)
Regulatory Over/(Under) Recoveries, Net	116,288	(271,689)	(141,865)
Amortization of Regulatory Assets/(Liabilities), Net	107,553	130,869	16,150
Cost of Removal Expenditures	(66,611)	(59,187)	(68,290)
Other	(116,923)	(25,876)	(2,123)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(256,463)	(179,783)	(82,659)
Taxes Receivable/Accrued, Net	(8,468)	(37,779)	27,394
Accounts Payable	64,915	1,412	11,357
Other Current Assets and Liabilities, Net	25,993	(23,137)	(40,974)
Net Cash Flows Provided by Operating Activities	980,452	687,562	713,557
Investing Activities:
Investments in Property, Plant and Equipment	(1,561,071)	(1,563,326)	(1,376,135)
Other Investing Activities	0	0	48
Net Cash Flows Used in Investing Activities	(1,561,071)	(1,563,326)	(1,376,087)
Financing Activities:
Cash Dividends on Common Shares	(436,000)	(643,900)	(327,400)
Cash Dividends on Preferred Stock	(1,960)	(1,960)	(1,960)
(Decrease)/Increase in Notes Payable	(259,337)	138,935	365,847
Capital Contributions from Eversource Parent	450,000	775,000	234,900
Issuance of Long-Term Debt	1,100,000	600,000	150,000
Retirement of Long-Term Debt	(250,000)	0	(80,000)
Other Financing Activities	(5,163)	(6,073)	(1,365)
Net Cash Flows Provided by Financing Activities	597,540	862,002	340,022
Net Increase/(Decrease) in Cash and Restricted Cash	16,921	(13,762)	(322,508)
Cash and Restricted Cash - Beginning of Year	9,023	22,785	345,293
Cash and Restricted Cash - End of Year	$ 25,944	$ 9,023	$ 22,785