NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current Assets:
Cash	$ 270,184	$ 135,351
Receivables, Net (net of allowance for uncollectible accounts)	2,080,805	1,847,094
Unbilled Revenues	217,605	275,108
Materials, Supplies and REC Inventory	489,415	491,592
Regulatory Assets	1,897,191	1,975,083
Prepayments and Other Current Assets	389,535	352,958
Total Current Assets	5,344,735	5,077,186
Property, Plant and Equipment, Net	46,470,244	45,930,959
Deferred Debits and Other Assets:
Regulatory Assets	5,768,159	5,718,646
Prepaid Pension and PBOP	1,566,418	1,511,169
Other Long-Term Assets	1,002,089	997,883
Total Deferred Debits and Other Assets	12,892,622	12,778,566
Total Assets	64,707,601	63,786,711
Current Liabilities:
Notes Payable	533,000	1,525,445
Long-Term Debt – Current Portion	2,643,097	1,392,948
Accounts Payable	1,662,046	1,859,692
Regulatory Liabilities	1,739,987	1,264,609
Other Current Liabilities	1,290,226	1,274,450
Total Current Liabilities	8,209,723	7,808,512
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	5,894,583	5,647,218
Regulatory Liabilities	4,323,619	4,273,465
Derivative Liabilities	100,531	100,859
Other Long-Term Liabilities	1,138,347	1,101,932
Total Deferred Credits and Other Liabilities	12,690,972	12,472,065
Long-Term Debt	26,861,131	26,872,433
Preferred Stock Not Subject to Mandatory Redemption	155,568	155,568
Common Shareholders' Equity:
Capital Surplus, Paid In	9,950,113	9,937,878
Retained Earnings	4,815,846	4,504,983
Accumulated Other Comprehensive Income (Loss)	(20,377)	(20,507)
Common Shareholders' Equity	16,530,950	16,197,271
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	64,707,601	63,786,711
NSTAR Electric Company
Current Assets:
Cash	190,821	8,302
Unbilled Revenues	45,989	56,948
Materials, Supplies and REC Inventory	234,150	210,865
Regulatory Assets	1,018,886	978,754
Derivative Assets	131,156	91,011
Prepayments and Other Current Assets	15,606	90,040
Total Current Assets	2,412,656	2,332,299
Property, Plant and Equipment, Net	15,569,419	15,308,896
Deferred Debits and Other Assets:
Regulatory Assets	1,805,604	1,823,522
Prepaid Pension and PBOP	826,909	804,109
Other Long-Term Assets	275,491	264,073
Total Deferred Debits and Other Assets	2,908,004	2,891,704
Total Assets	20,890,079	20,532,899
Current Liabilities:
Notes Payable	0	245,445
Long-Term Debt – Current Portion	300,000	300,000
Obligations to Third Party Suppliers	183,320	179,757
Renewable Portfolio Standards Compliance Obligations	117,185	98,648
Regulatory Liabilities	835,408	650,813
Other Current Liabilities	148,805	110,331
Total Current Liabilities	2,338,352	2,341,306
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	2,110,852	2,087,287
Regulatory Liabilities	1,722,355	1,702,059
Derivative Liabilities	636,179	753,149
Other Long-Term Liabilities	410,335	401,625
Total Deferred Credits and Other Liabilities	4,879,721	4,944,120
Long-Term Debt	5,646,738	5,645,638
Preferred Stock Not Subject to Mandatory Redemption	43,000	43,000
Common Shareholders' Equity:
Common Stock	0	0
Capital Surplus, Paid In	4,496,842	4,238,842
Retained Earnings	3,485,228	3,319,768
Accumulated Other Comprehensive Income (Loss)	198	225
Common Shareholders' Equity	7,982,268	7,558,835
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	20,890,079	20,532,899
NSTAR Electric Company | Nonrelated Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	575,045	616,280
Current Liabilities:
Accounts Payable	566,106	558,227
NSTAR Electric Company | Related Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	201,003	280,099
Current Liabilities:
Accounts Payable	$ 187,528	$ 198,085