CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current Assets:
Cash	$ 217,397	$ 106,599
Receivables, Net (net of allowance for uncollectible accounts)	1,224,092	1,195,925
Unbilled Revenues	188,356	233,025
Fuel, Materials, Supplies and REC Inventory	187,692	265,599
Regulatory Assets	1,186,851	1,076,556
Prepayments and Other Current Assets	264,451	252,439
Total Current Assets	3,268,839	3,130,143
Property, Plant and Equipment, Net	31,878,551	30,882,523
Deferred Debits and Other Assets:
Regulatory Assets	5,246,381	5,493,330
Goodwill	4,453,618	4,445,988
Investments in Unconsolidated Affiliates	1,205,303	1,107,143
Marketable Securities	462,953	456,617
Other Long-Term Assets	718,995	583,854
Total Deferred Debits and Other Assets	12,087,250	12,086,932
Total Assets	47,234,640	46,099,598
Current Liabilities:
Notes Payable	2,002,500	1,249,325
Long-Term Debt – Current Portion	799,858	1,053,186
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	1,061,111	1,370,647
Regulatory Liabilities	532,467	389,430
Other Current Liabilities	665,424	809,214
Total Current Liabilities	5,104,570	4,915,012
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	4,258,986	4,095,339
Regulatory Liabilities	3,880,131	3,850,781
Derivative Liabilities	275,775	294,535
Asset Retirement Obligations	503,405	499,713
Accrued Pension, SERP and PBOP	1,455,479	1,653,788
Other Long-Term Liabilities	962,166	948,506
Total Deferred Credits and Other Liabilities	11,335,942	11,342,662
Long-Term Debt	15,851,362	15,125,876
Rate Reduction Bonds	475,307	496,912
Noncontrolling Interest – Preferred Stock of Subsidiaries	155,570	155,570
Common Shareholders' Equity:
Common Shares	1,789,092	1,789,092
Capital Surplus, Paid In	8,032,959	8,015,663
Retained Earnings	4,830,058	4,613,201
Accumulated Other Comprehensive Income (Loss)	(74,342)	(76,411)
Treasury Stock	(265,878)	(277,979)
Common Shareholders' Equity	14,311,889	14,063,566
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	47,234,640	46,099,598
The Connecticut Light and Power Company
Current Assets:
Cash	198,390	90,801
Receivables, Net (net of allowance for uncollectible accounts)	496,612	459,214
Accounts Receivable from Affiliated Companies	38,840	17,486
Unbilled Revenues	58,191	57,407
Fuel, Materials, Supplies and REC Inventory	51,947	57,924
Regulatory Assets	458,609	345,622
Prepayments and Other Current Assets	44,357	83,950
Total Current Assets	1,346,946	1,112,404
Property, Plant and Equipment, Net	10,479,192	10,234,556
Deferred Debits and Other Assets:
Regulatory Assets	1,745,793	1,866,152
Other Long-Term Assets	273,279	242,862
Total Deferred Debits and Other Assets	2,019,072	2,109,014
Total Assets	13,845,210	13,455,974
Current Liabilities:
Accounts Payable	290,413	451,240
Accounts Payable to Affiliated Companies	97,558	51,118
Obligations to Third Party Suppliers	46,898	49,967
Regulatory Liabilities	219,813	137,166
Derivative Liabilities	70,935	68,767
Other Current Liabilities	104,670	102,060
Total Current Liabilities	830,287	860,318
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,460,962	1,408,343
Regulatory Liabilities	1,207,289	1,204,942
Derivative Liabilities	275,775	294,535
Accrued Pension, SERP and PBOP	364,990	478,325
Other Long-Term Liabilities	138,337	133,690
Total Deferred Credits and Other Liabilities	3,447,353	3,519,835
Long-Term Debt	4,335,639	3,914,835
Noncontrolling Interest – Preferred Stock of Subsidiaries	116,200	116,200
Common Shareholders' Equity:
Common Shares	60,352	60,352
Capital Surplus, Paid In	2,810,765	2,810,765
Retained Earnings	2,244,341	2,173,367
Accumulated Other Comprehensive Income (Loss)	273	302
Common Shareholders' Equity	5,115,731	5,044,786
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	13,845,210	13,455,974
NSTAR Electric Company
Current Assets:
Cash	577	102
Receivables, Net (net of allowance for uncollectible accounts)	445,853	403,045
Accounts Receivable from Affiliated Companies	21,455	30,095
Unbilled Revenues	47,689	38,342
Fuel, Materials, Supplies and REC Inventory	74,638	133,894
Taxes Receivable	6,814	65,051
Regulatory Assets	448,030	399,882
Prepayments and Other Current Assets	24,494	21,833
Total Current Assets	1,069,550	1,092,244
Property, Plant and Equipment, Net	10,437,198	10,123,062
Deferred Debits and Other Assets:
Regulatory Assets	1,236,379	1,304,019
Prepaid PBOP	216,692	204,138
Other Long-Term Assets	173,815	162,836
Total Deferred Debits and Other Assets	1,626,886	1,670,993
Total Assets	13,133,634	12,886,299
Current Liabilities:
Notes Payable	555,500	195,000
Notes Payable to Eversource Parent	21,500	21,300
Long-Term Debt – Current Portion	0	250,000
Accounts Payable	308,106	383,558
Accounts Payable to Affiliated Companies	90,385	95,703
Obligations to Third Party Suppliers	122,760	98,572
Renewable Portfolio Standards Compliance Obligations	47,041	127,536
Regulatory Liabilities	172,988	164,761
Other Current Liabilities	49,826	72,118
Total Current Liabilities	1,368,106	1,408,548
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,504,188	1,459,906
Regulatory Liabilities	1,552,053	1,550,390
Accrued Pension, SERP and PBOP	127,248	172,571
Other Long-Term Liabilities	348,504	337,245
Total Deferred Credits and Other Liabilities	3,531,993	3,520,112
Long-Term Debt	3,688,259	3,393,221
Noncontrolling Interest – Preferred Stock of Subsidiaries	43,000	43,000
Common Shareholders' Equity:
Common Shares	0	0
Capital Surplus, Paid In	2,053,942	1,993,942
Retained Earnings	2,447,823	2,527,167
Accumulated Other Comprehensive Income (Loss)	511	309
Common Shareholders' Equity	4,502,276	4,521,418
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	13,133,634	12,886,299
Public Service Company of New Hampshire
Current Assets:
Cash	279	141
Receivables, Net (net of allowance for uncollectible accounts)	119,138	119,899
Accounts Receivable from Affiliated Companies	7,274	10,925
Unbilled Revenues	51,150	46,041
Fuel, Materials, Supplies and REC Inventory	23,333	26,829
Regulatory Assets	99,474	115,852
Prepaid Property Taxes	18,527	26,257
Special Deposits	35,109	36,767
Prepayments and Other Current Assets	5,215	10,788
Total Current Assets	359,499	393,499
Property, Plant and Equipment, Net	3,467,810	3,374,270
Deferred Debits and Other Assets:
Regulatory Assets	850,912	873,203
Other Long-Term Assets	21,492	23,733
Total Deferred Debits and Other Assets	872,404	896,936
Total Assets	4,699,713	4,664,705
Current Liabilities:
Notes Payable to Eversource Parent	48,600	46,300
Long-Term Debt – Current Portion	0	282,000
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	122,068	132,635
Accounts Payable to Affiliated Companies	28,191	43,397
Regulatory Liabilities	61,891	58,756
Other Current Liabilities	46,984	58,487
Total Current Liabilities	350,944	664,785
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	546,568	537,627
Regulatory Liabilities	384,675	383,183
Accrued Pension, SERP and PBOP	169,001	184,715
Other Long-Term Liabilities	37,523	37,874
Total Deferred Credits and Other Liabilities	1,137,767	1,143,399
Long-Term Debt	1,163,710	817,070
Rate Reduction Bonds	475,307	496,912
Common Shareholders' Equity:
Common Shares	0	0
Capital Surplus, Paid In	1,088,134	928,134
Retained Earnings	483,927	615,018
Accumulated Other Comprehensive Income (Loss)	(76)	(613)
Common Shareholders' Equity	1,571,985	1,542,539
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	$ 4,699,713	$ 4,664,705