NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current Assets:
Cash and Cash Equivalents	$ 97,900	$ 53,900
Receivables, Net (net of allowance for uncollectible accounts)	1,562,525	1,431,531
Unbilled Revenues	169,218	225,325
Materials, Supplies and REC Inventory	564,189	507,307
Regulatory Assets	2,024,897	1,674,196
Prepayments and Other Current Assets	414,190	355,762
Total Current Assets	4,832,907	4,247,994
Property, Plant and Equipment, Net	41,911,467	39,498,607
Deferred Debits and Other Assets:
Regulatory Assets	4,993,145	4,714,970
Prepaid Pension and PBOP	1,158,142	1,028,207
Other Long-Term Assets	645,442	592,080
Total Deferred Debits and Other Assets	11,828,945	11,865,644
Total Assets	58,573,319	55,612,245
Current Liabilities:
Notes Payable	759,500	1,930,422
Accounts Payable	1,562,164	1,869,187
Regulatory Liabilities	722,495	591,750
Other Current Liabilities	781,871	821,404
Total Current Liabilities	5,619,824	6,341,397
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	5,330,509	5,303,730
Regulatory Liabilities	4,124,761	4,022,923
Other Long-Term Liabilities	1,367,201	1,029,238
Total Deferred Credits and Other Liabilities	11,458,023	10,985,489
Long-Term Debt	25,971,408	23,588,616
Preferred Stock Not Subject to Mandatory Redemption	155,568	155,569
Common Shareholders' Equity:
Capital Surplus, Paid In	9,263,434	8,460,876
Retained Earnings	4,118,654	4,142,515
Accumulated Other Comprehensive (Loss)/Income	(28,205)	(33,737)
Common Shareholders' Equity	15,044,424	14,173,892
Commitments and Contingencies
Total Liabilities and Capitalization	58,573,319	55,612,245
NSTAR Electric Company
Current Assets:
Cash and Cash Equivalents	4,467	6,740
Unbilled Revenues	50,430	49,897
Materials, Supplies and REC Inventory	182,243	173,770
Regulatory Assets	778,916	676,083
Prepayments and Other Current Assets	20,651	41,464
Total Current Assets	1,746,131	1,510,295
Property, Plant and Equipment, Net	13,627,246	12,753,787
Deferred Debits and Other Assets:
Regulatory Assets	1,270,882	1,281,836
Prepaid Pension and PBOP	674,903	608,617
Other Long-Term Assets	148,340	116,978
Total Deferred Debits and Other Assets	2,094,125	2,007,431
Total Assets	17,467,502	16,271,513
Current Liabilities:
Notes Payable	537,500	365,847
Obligations to Third Party Suppliers	179,142	139,823
Renewable Portfolio Standards Compliance Obligations	85,208	116,010
Regulatory Liabilities	468,756	368,070
Other Current Liabilities	116,287	84,688
Total Current Liabilities	2,024,824	1,818,756
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,938,528	1,849,613
Regulatory Liabilities	1,623,764	1,585,311
Other Long-Term Liabilities	361,480	327,388
Total Deferred Credits and Other Liabilities	3,923,772	3,762,312
Long-Term Debt	5,093,701	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	3,388,842	3,013,842
Retained Earnings	2,993,371	3,136,612
Accumulated Other Comprehensive (Loss)/Income	(8)	44
Common Shareholders' Equity	6,382,205	6,150,498
Commitments and Contingencies
Total Liabilities and Capitalization	17,467,502	16,271,513
NSTAR Electric Company | Nonrelated Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	537,673	487,707
Current Liabilities:
Accounts Payable	500,606	599,696
NSTAR Electric Company | Related Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	171,751	74,634
Current Liabilities:
Accounts Payable	$ 137,325	$ 144,622