CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current Assets:
Cash	$ 34,112	$ 106,599
Receivables, Net (net of allowance for uncollectible accounts)	1,290,200	1,195,925
Unbilled Revenues	194,673	233,025
Fuel, Materials, Supplies and REC Inventory	308,093	265,599
Regulatory Assets	1,081,074	1,076,556
Prepayments and Other Current Assets	238,727	252,439
Total Current Assets	3,146,879	3,130,143
Property, Plant and Equipment, Net	31,265,819	30,882,523
Deferred Debits and Other Assets:
Regulatory Assets	5,431,459	5,493,330
Goodwill	4,453,055	4,445,988
Investments in Unconsolidated Affiliates	1,139,636	1,107,143
Marketable Securities	447,320	456,617
Other Long-Term Assets	634,047	583,854
Total Deferred Debits and Other Assets	12,105,517	12,086,932
Total Assets	46,518,215	46,099,598
Current Liabilities:
Notes Payable	1,872,444	1,249,325
Long-Term Debt – Current Portion	1,211,191	1,053,186
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	1,060,867	1,370,647
Regulatory Liabilities	520,833	389,430
Other Current Liabilities	830,399	809,214
Total Current Liabilities	5,538,944	4,915,012
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	4,157,932	4,095,339
Regulatory Liabilities	3,863,031	3,850,781
Derivative Liabilities	293,560	294,535
Asset Retirement Obligations	500,276	499,713
Accrued Pension, SERP and PBOP	1,565,753	1,653,788
Other Long-Term Liabilities	951,750	948,506
Total Deferred Credits and Other Liabilities	11,332,302	11,342,662
Long-Term Debt	14,782,672	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	8,016,118	8,015,663
Retained Earnings	4,772,431	4,613,201
Accumulated Other Comprehensive Income (Loss)	(75,223)	(76,411)
Treasury Stock	(268,998)	(277,979)
Common Shareholders' Equity	14,233,420	14,063,566
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	46,518,215	46,099,598
The Connecticut Light and Power Company
Current Assets:
Cash	9,256	90,801
Receivables, Net (net of allowance for uncollectible accounts)	483,711	459,214
Accounts Receivable from Affiliated Companies	40,721	17,486
Unbilled Revenues	50,522	57,407
Fuel, Materials, Supplies and REC Inventory	57,301	57,924
Regulatory Assets	386,140	345,622
Prepayments and Other Current Assets	88,153	83,950
Total Current Assets	1,115,804	1,112,404
Property, Plant and Equipment, Net	10,344,782	10,234,556
Deferred Debits and Other Assets:
Regulatory Assets	1,863,935	1,866,152
Other Long-Term Assets	258,126	242,862
Total Deferred Debits and Other Assets	2,122,061	2,109,014
Total Assets	13,582,647	13,455,974
Current Liabilities:
Notes Payable to Eversource Parent	32,100	0
Accounts Payable	369,838	451,240
Accounts Payable to Affiliated Companies	121,868	51,118
Obligations to Third Party Suppliers	48,762	49,967
Regulatory Liabilities	202,362	137,166
Derivative Liabilities	69,738	68,767
Accrued Interest	49,637	37,645
Other Current Liabilities	63,690	64,415
Total Current Liabilities	957,995	860,318
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,438,413	1,408,343
Regulatory Liabilities	1,203,616	1,204,942
Derivative Liabilities	293,560	294,535
Accrued Pension, SERP and PBOP	449,944	478,325
Other Long-Term Liabilities	136,508	133,690
Total Deferred Credits and Other Liabilities	3,522,041	3,519,835
Long-Term Debt	3,914,749	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	2,200,275	2,173,367
Accumulated Other Comprehensive Income (Loss)	270	302
Common Shareholders' Equity	5,071,662	5,044,786
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	13,582,647	13,455,974
NSTAR Electric Company
Current Assets:
Cash	57	102
Receivables, Net (net of allowance for uncollectible accounts)	409,403	403,045
Accounts Receivable from Affiliated Companies	39,582	30,095
Unbilled Revenues	34,265	38,342
Fuel, Materials, Supplies and REC Inventory	186,892	133,894
Taxes Receivable	6,045	65,051
Regulatory Assets	430,361	399,882
Prepayments and Other Current Assets	23,907	21,833
Total Current Assets	1,130,512	1,092,244
Property, Plant and Equipment, Net	10,252,264	10,123,062
Deferred Debits and Other Assets:
Regulatory Assets	1,273,997	1,304,019
Prepaid PBOP	211,715	204,138
Other Long-Term Assets	161,451	162,836
Total Deferred Debits and Other Assets	1,647,163	1,670,993
Total Assets	13,029,939	12,886,299
Current Liabilities:
Notes Payable	443,500	195,000
Notes Payable to Eversource Parent	22,500	21,300
Long-Term Debt – Current Portion	250,000	250,000
Accounts Payable	275,923	383,558
Accounts Payable to Affiliated Companies	120,697	95,703
Obligations to Third Party Suppliers	120,632	98,572
Renewable Portfolio Standards Compliance Obligations	156,607	127,536
Regulatory Liabilities	190,546	164,761
Other Current Liabilities	74,789	72,118
Total Current Liabilities	1,655,194	1,408,548
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,477,998	1,459,906
Regulatory Liabilities	1,556,422	1,550,390
Accrued Pension, SERP and PBOP	156,342	172,571
Other Long-Term Liabilities	338,672	337,245
Total Deferred Credits and Other Liabilities	3,529,434	3,520,112
Long-Term Debt	3,393,798	3,393,221
Noncontrolling Interest – Preferred Stock of Subsidiaries	43,000	43,000
Common Shareholders' Equity:
Common Shares	0	0
Capital Surplus, Paid In	1,993,942	1,993,942
Retained Earnings	2,414,201	2,527,167
Accumulated Other Comprehensive Income (Loss)	370	309
Common Shareholders' Equity	4,408,513	4,521,418
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	13,029,939	12,886,299
Public Service Company of New Hampshire
Current Assets:
Cash	1,988	141
Receivables, Net (net of allowance for uncollectible accounts)	115,592	119,899
Accounts Receivable from Affiliated Companies	13,113	10,925
Unbilled Revenues	43,152	46,041
Fuel, Materials, Supplies and REC Inventory	29,125	26,829
Regulatory Assets	107,322	115,852
Prepaid Property Taxes	6,403	26,257
Special Deposits	22,196	36,767
Prepayments and Other Current Assets	3,113	10,788
Total Current Assets	342,004	393,499
Property, Plant and Equipment, Net	3,412,781	3,374,270
Deferred Debits and Other Assets:
Regulatory Assets	869,904	873,203
Other Long-Term Assets	24,412	23,733
Total Deferred Debits and Other Assets	894,316	896,936
Total Assets	4,649,101	4,664,705
Current Liabilities:
Notes Payable to Eversource Parent	196,800	46,300
Long-Term Debt – Current Portion	160,000	282,000
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	101,274	132,635
Accounts Payable to Affiliated Companies	44,206	43,397
Regulatory Liabilities	48,023	58,756
Other Current Liabilities	53,908	58,487
Total Current Liabilities	647,421	664,785
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	544,495	537,627
Regulatory Liabilities	386,455	383,183
Accrued Pension, SERP and PBOP	177,733	184,715
Other Long-Term Liabilities	38,071	37,874
Total Deferred Credits and Other Liabilities	1,146,754	1,143,399
Long-Term Debt	817,349	817,070
Rate Reduction Bonds	475,307	496,912
Common Shareholders' Equity:
Common Shares	0	0
Capital Surplus, Paid In	928,134	928,134
Retained Earnings	634,494	615,018
Accumulated Other Comprehensive Income (Loss)	(358)	(613)
Common Shareholders' Equity	1,562,270	1,542,539
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	$ 4,649,101	$ 4,664,705