NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current Assets:
Cash	$ 259,213	$ 53,873
Receivables, Net (net of allowance for uncollectible accounts)	1,593,487	1,431,531
Unbilled Revenues	195,594	225,325
Materials, Supplies and REC Inventory	555,211	507,307
Regulatory Assets	1,889,499	1,674,196
Prepayments and Other Current Assets	387,854	355,762
Total Current Assets	4,880,858	4,247,994
Property, Plant and Equipment, Net	40,289,378	39,498,607
Deferred Debits and Other Assets:
Regulatory Assets	4,839,271	4,714,970
Prepaid Pension and PBOP	1,085,121	1,028,207
Other Long-Term Assets	619,472	592,080
Total Deferred Debits and Other Assets	12,151,989	11,865,644
Total Assets	57,322,225	55,612,245
Current Liabilities:
Notes Payable	2,102,871	1,930,422
Accounts Payable	1,663,661	1,869,187
Regulatory Liabilities	641,472	591,750
Other Current Liabilities	1,050,998	1,081,981
Total Current Liabilities	6,367,586	6,341,397
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	5,314,688	5,303,730
Regulatory Liabilities	4,051,377	4,022,923
Other Long-Term Liabilities	983,853	1,029,238
Total Deferred Credits and Other Liabilities	10,979,993	10,985,489
Long-Term Debt	24,929,813	23,588,616
Preferred Stock Not Subject to Mandatory Redemption	155,568	155,569
Common Shareholders' Equity:
Capital Surplus, Paid In	8,537,591	8,460,876
Retained Earnings	4,413,593	4,142,515
Accumulated Other Comprehensive Income	(28,534)	(33,737)
Common Shareholders' Equity	14,543,588	14,173,892
Commitments and Contingencies
Total Liabilities and Capitalization	57,322,225	55,612,245
NSTAR Electric Company
Current Assets:
Cash	20,226	6,740
Unbilled Revenues	47,999	49,897
Materials, Supplies and REC Inventory	210,993	173,770
Regulatory Assets	718,726	676,083
Prepayments and Other Current Assets	65,926	41,464
Total Current Assets	1,684,094	1,510,295
Property, Plant and Equipment, Net	13,040,321	12,753,787
Deferred Debits and Other Assets:
Regulatory Assets	1,322,249	1,281,836
Prepaid Pension and PBOP	629,131	608,617
Other Long-Term Assets	125,196	116,978
Total Deferred Debits and Other Assets	2,076,576	2,007,431
Total Assets	16,800,991	16,271,513
Current Liabilities:
Notes Payable	419,000	365,847
Obligations to Third Party Suppliers	162,414	139,823
Renewable Portfolio Standards Compliance Obligations	142,193	116,010
Regulatory Liabilities	405,190	368,070
Other Current Liabilities	86,460	84,688
Total Current Liabilities	1,917,118	1,818,756
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,892,041	1,849,613
Regulatory Liabilities	1,603,079	1,585,311
Other Long-Term Liabilities	334,530	327,388
Total Deferred Credits and Other Liabilities	3,829,650	3,762,312
Long-Term Debt	4,497,954	4,496,947
Preferred Stock Not Subject to Mandatory Redemption	43,000	43,000
Common Shareholders' Equity:
Common Stock	0	0
Capital Surplus, Paid In	3,313,842	3,013,842
Retained Earnings	3,199,399	3,136,612
Accumulated Other Comprehensive Income	28	44
Common Shareholders' Equity	6,513,269	6,150,498
Commitments and Contingencies
Total Liabilities and Capitalization	16,800,991	16,271,513
NSTAR Electric Company | Nonrelated Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	545,961	487,707
Current Liabilities:
Accounts Payable	486,110	599,696
NSTAR Electric Company | Related Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	74,263	74,634
Current Liabilities:
Accounts Payable	$ 215,751	$ 144,622