CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities:
Net Income	$ 368,023	$ 336,633
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	270,704	236,211
Deferred Income Taxes	41,917	44,201
Uncollectible Expense	16,295	11,353
Pension, SERP and PBOP (Income)/Expense, Net	(2,341)	1,953
Pension and PBOP Contributions	(31,100)	(723)
Regulatory Over/(Under) Recoveries, Net	58,024	(22,288)
Amortization	108,013	49,776
Other	(91,246)	(33,317)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(124,344)	(55,290)
Fuel, Materials, Supplies and REC Inventory	(42,494)	(51,027)
Taxes Receivable/Accrued, Net	64,076	92,140
Accounts Payable	(181,725)	(127,366)
Other Current Assets and Liabilities, Net	(42,386)	(61,950)
Net Cash Flows Provided by Operating Activities	411,416	420,306
Investing Activities:
Investments in Property, Plant and Equipment	(688,983)	(725,520)
Proceeds from Sales of Marketable Securities	79,818	58,627
Purchases of Marketable Securities	(68,360)	(50,723)
Investments in Unconsolidated Affiliates, Net	(34,127)	(6,113)
Other Investing Activities	7,135	6,119
Net Cash Flows Used in Investing Activities	(704,517)	(717,610)
Financing Activities:
Issuance of Common Shares, Net of Issuance Costs	0	419,786
Cash Dividends on Common Shares	(201,013)	(181,608)
Cash Dividends on Preferred Stock	(1,880)	(1,880)
(Decrease)/Increase in Notes Payable	669,919	(408,950)
Repayment of Rate Reduction Bonds	(21,605)	(21,605)
Issuance of Long-Term Debt	350,000	750,000
Retirement of Long-Term Debt	(572,000)	(220,253)
Other Financing Activities	(19,666)	(21,560)
Net Cash Flows (Used in)/Provided by Financing Activities	203,755	313,930
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	(89,346)	16,626
Cash and Restricted Cash - Beginning of Period	264,950	117,063
Cash and Restricted Cash - End of Period	175,604	133,689
The Connecticut Light and Power Company
Operating Activities:
Net Income	98,398	118,738
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	83,405	78,435
Deferred Income Taxes	25,354	19,910
Uncollectible Expense	3,797	3,230
Pension, SERP and PBOP (Income)/Expense, Net	3,088	3,315
Pension and PBOP Contributions	(18,940)	0
Regulatory Over/(Under) Recoveries, Net	(29,971)	(34,198)
Amortization of Regulatory Assets, Net	62,775	6,548
Other	(30,070)	(27,239)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(66,930)	(27,969)
Taxes Receivable/Accrued, Net	29,596	40,505
Accounts Payable	17,124	(27,298)
Other Current Assets and Liabilities, Net	(21,433)	(21,801)
Net Cash Flows Provided by Operating Activities	156,193	132,176
Investing Activities:
Investments in Property, Plant and Equipment	(197,954)	(212,374)
Other Investing Activities	80	74
Net Cash Flows Used in Investing Activities	(197,874)	(212,300)
Financing Activities:
Cash Dividends on Common Shares	(70,100)	(69,500)
Cash Dividends on Preferred Stock	(1,390)	(1,390)
Increase in Notes Payable to Eversource Parent	32,100	155,200
Other Financing Activities	(450)	(390)
Net Cash Flows (Used in)/Provided by Financing Activities	(39,840)	83,920
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	(81,521)	3,796
Cash and Restricted Cash - Beginning of Period	99,809	4,971
Cash and Restricted Cash - End of Period	18,288	8,767
NSTAR Electric Company
Operating Activities:
Net Income	93,924	100,390
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	82,793	78,345
Deferred Income Taxes	10,309	9,775
Uncollectible Expense	3,868	3,704
Pension, SERP and PBOP Income, Net	(6,335)	(4,754)
Regulatory Over/(Under) Recoveries, Net	(3,405)	(17,434)
Amortization of Regulatory Assets, Net	18,418	27,008
Other	(23,586)	(1,643)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(14,587)	(64,951)
Fuel, Materials, Supplies and REC Inventory	(52,998)	(54,450)
Taxes Receivable/Accrued, Net	58,353	32,135
Accounts Payable	(45,604)	(53,462)
Other Current Assets and Liabilities, Net	51,445	7,033
Net Cash Flows Provided by Operating Activities	172,595	61,696
Investing Activities:
Investments in Property, Plant and Equipment	(215,483)	(247,549)
Other Investing Activities	22	21
Net Cash Flows Used in Investing Activities	(215,461)	(247,528)
Financing Activities:
Cash Dividends on Common Shares	(206,400)	(196,500)
Cash Dividends on Preferred Stock	(490)	(490)
Increase in Notes Payable to Eversource Parent	1,200	8,100
(Decrease)/Increase in Notes Payable	248,500	77,500
Issuance of Long-Term Debt	0	400,000
Retirement of Long-Term Debt	0	(95,000)
Other Financing Activities	19	(4,961)
Net Cash Flows (Used in)/Provided by Financing Activities	42,829	188,649
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	(37)	2,817
Cash and Restricted Cash - Beginning of Period	17,410	6,312
Cash and Restricted Cash - End of Period	17,373	9,129
Public Service Company of New Hampshire
Operating Activities:
Net Income	44,676	39,601
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	29,468	24,334
Deferred Income Taxes	(378)	4,167
Uncollectible Expense	1,221	666
Regulatory Over/(Under) Recoveries, Net	(14,645)	(22,977)
Amortization of Regulatory Assets, Net	18,547	20,110
Other	(6,654)	(3,885)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	3,223	2,843
Fuel, Materials, Supplies and REC Inventory	(2,296)	(3,526)
Taxes Receivable/Accrued, Net	9,867	6,110
Accounts Payable	(21,025)	(18,064)
Other Current Assets and Liabilities, Net	12,897	9,118
Net Cash Flows Provided by Operating Activities	74,901	58,497
Investing Activities:
Investments in Property, Plant and Equipment	(68,278)	(88,694)
Other Investing Activities	137	126
Net Cash Flows Used in Investing Activities	(68,141)	(88,568)
Financing Activities:
Cash Dividends on Common Shares	(25,200)	(22,300)
Repayment of Rate Reduction Bonds	(21,605)	(21,605)
Retirement of Long-Term Debt	(122,000)	0
Increase in Notes Payable to Eversource Parent	150,500	57,700
Other Financing Activities	(22)	(22)
Net Cash Flows (Used in)/Provided by Financing Activities	(18,327)	13,773
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	(11,567)	(16,298)
Cash and Restricted Cash - Beginning of Period	39,555	36,688
Cash and Restricted Cash - End of Period	$ 27,988	$ 20,390