CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current Assets:
Cash	$ 88,204	$ 106,599
Receivables, Net (net of allowance for uncollectible accounts)	1,288,758	1,195,925
Unbilled Revenues	176,325	233,025
Fuel, Materials, Supplies and REC Inventory	217,286	265,599
Regulatory Assets	1,016,304	1,076,556
Prepayments	177,869	105,620
Other Current Assets	108,807	146,819
Total Current Assets	3,073,553	3,130,143
Property, Plant and Equipment, Net	32,467,069	30,882,523
Deferred Debits and Other Assets:
Regulatory Assets	5,458,928	5,493,330
Goodwill	4,453,618	4,445,988
Investments in Unconsolidated Affiliates	1,356,313	1,107,143
Marketable Securities	466,628	456,617
Other Long-Term Assets	737,946	583,854
Total Deferred Debits and Other Assets	12,473,433	12,086,932
Total Assets	48,014,055	46,099,598
Current Liabilities:
Notes Payable	711,000	1,249,325
Long-Term Debt – Current Portion	798,880	1,053,186
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	1,289,225	1,370,647
Regulatory Liabilities	612,931	389,430
Other Current Liabilities	802,831	809,214
Total Current Liabilities	4,258,077	4,915,012
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	4,341,105	4,095,339
Regulatory Liabilities	3,907,582	3,850,781
Derivative Liabilities	256,569	294,535
Asset Retirement Obligations	505,005	499,713
Accrued Pension, SERP and PBOP	1,330,037	1,653,788
Other Long-Term Liabilities	974,497	948,506
Total Deferred Credits and Other Liabilities	11,314,795	11,342,662
Long-Term Debt	17,420,300	15,125,876
Rate Reduction Bonds	453,702	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	8,050,872	8,015,663
Retained Earnings	4,906,151	4,613,201
Accumulated Other Comprehensive Income (Loss)	(71,865)	(76,411)
Treasury Stock	(262,639)	(277,979)
Common Shareholders' Equity	14,411,611	14,063,566
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	48,014,055	46,099,598
The Connecticut Light and Power Company
Current Assets:
Cash	62,791	90,801
Receivables, Net (net of allowance for uncollectible accounts)	549,144	459,214
Accounts Receivable from Affiliated Companies	38,544	17,486
Unbilled Revenues	52,589	57,407
Fuel, Materials, Supplies and REC Inventory	54,894	57,924
Regulatory Assets	325,268	345,622
Prepaid Property Taxes	76,829	25,779
Other Current Assets	47,402	58,171
Total Current Assets	1,207,461	1,112,404
Property, Plant and Equipment, Net	10,598,836	10,234,556
Deferred Debits and Other Assets:
Regulatory Assets	1,981,805	1,866,152
Other Long-Term Assets	267,312	242,862
Total Deferred Debits and Other Assets	2,249,117	2,109,014
Total Assets	14,055,414	13,455,974
Current Liabilities:
Accounts Payable	473,287	451,240
Accounts Payable to Affiliated Companies	98,298	51,118
Obligations to Third Party Suppliers	53,183	49,967
Regulatory Liabilities	311,269	137,166
Derivative Liabilities	72,249	68,767
Other Current Liabilities	168,547	102,060
Total Current Liabilities	1,176,833	860,318
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,495,407	1,408,343
Regulatory Liabilities	1,213,469	1,204,942
Derivative Liabilities	256,569	294,535
Accrued Pension, SERP and PBOP	313,206	478,325
Other Long-Term Liabilities	154,249	133,690
Total Deferred Credits and Other Liabilities	3,432,900	3,519,835
Long-Term Debt	4,215,096	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	2,243,004	2,173,367
Accumulated Other Comprehensive Income (Loss)	264	302
Common Shareholders' Equity	5,114,385	5,044,786
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	14,055,414	13,455,974
NSTAR Electric Company
Current Assets:
Cash	3,538	102
Receivables, Net (net of allowance for uncollectible accounts)	489,503	403,045
Accounts Receivable from Affiliated Companies	27,417	30,095
Unbilled Revenues	47,844	38,342
Fuel, Materials, Supplies and REC Inventory	83,667	133,894
Taxes Receivable	0	65,051
Regulatory Assets	388,408	399,882
Other Current Assets	22,490	21,833
Total Current Assets	1,062,867	1,092,244
Property, Plant and Equipment, Net	10,611,728	10,123,062
Deferred Debits and Other Assets:
Regulatory Assets	1,247,715	1,304,019
Prepaid PBOP	224,244	204,138
Other Long-Term Assets	185,555	162,836
Total Deferred Debits and Other Assets	1,657,514	1,670,993
Total Assets	13,332,109	12,886,299
Current Liabilities:
Notes Payable	138,000	195,000
Notes Payable to Eversource Parent	24,600	21,300
Long-Term Debt – Current Portion	0	250,000
Accounts Payable	338,369	383,558
Accounts Payable to Affiliated Companies	78,974	95,703
Obligations to Third Party Suppliers	137,211	98,572
Renewable Portfolio Standards Compliance Obligations	72,124	127,536
Regulatory Liabilities	205,771	164,761
Other Current Liabilities	118,747	72,118
Total Current Liabilities	1,113,796	1,408,548
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,494,976	1,459,906
Regulatory Liabilities	1,561,572	1,550,390
Accrued Pension, SERP and PBOP	110,752	172,571
Other Long-Term Liabilities	344,088	337,245
Total Deferred Credits and Other Liabilities	3,511,388	3,520,112
Long-Term Debt	3,984,724	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	2,624,784	2,527,167
Accumulated Other Comprehensive Income (Loss)	475	309
Common Shareholders' Equity	4,679,201	4,521,418
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	13,332,109	12,886,299
Public Service Company of New Hampshire
Current Assets:
Cash	3,869	141
Receivables, Net (net of allowance for uncollectible accounts)	136,481	119,899
Accounts Receivable from Affiliated Companies	13,866	10,925
Unbilled Revenues	46,854	46,041
Fuel, Materials, Supplies and REC Inventory	24,789	26,829
Regulatory Assets	97,948	115,852
Prepaid Property Taxes	5,987	26,257
Special Deposits	18,605	36,767
Other Current Assets	2,851	10,788
Total Current Assets	351,250	393,499
Property, Plant and Equipment, Net	3,529,050	3,374,270
Deferred Debits and Other Assets:
Regulatory Assets	829,848	873,203
Other Long-Term Assets	22,684	23,733
Total Deferred Debits and Other Assets	852,532	896,936
Total Assets	4,732,832	4,664,705
Current Liabilities:
Notes Payable to Eversource Parent	66,500	46,300
Long-Term Debt – Current Portion	0	282,000
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	108,243	132,635
Accounts Payable to Affiliated Companies	25,055	43,397
Regulatory Liabilities	96,817	58,756
Other Current Liabilities	61,883	58,487
Total Current Liabilities	401,708	664,785
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	535,656	537,627
Regulatory Liabilities	389,426	383,183
Accrued Pension, SERP and PBOP	162,115	184,715
Other Long-Term Liabilities	35,564	37,874
Total Deferred Credits and Other Liabilities	1,122,761	1,143,399
Long-Term Debt	1,163,630	817,070
Rate Reduction Bonds	453,702	496,912
Common Shareholders' Equity:
Common Shares	0	0
Capital Surplus, Paid In	1,088,134	928,134
Retained Earnings	502,870	615,018
Accumulated Other Comprehensive Income (Loss)	27	(613)
Common Shareholders' Equity	1,591,031	1,542,539
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	$ 4,732,832	$ 4,664,705