CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Activities:
Net Income	$ 445,326	$ 368,023
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	289,330	270,704
Deferred Income Taxes	67,557	41,917
Uncollectible Expense	17,135	16,295
Pension, SERP and PBOP Income, Net	(40,642)	(2,341)
Pension and PBOP Contributions	(26,100)	(31,100)
Regulatory (Under)/Over Recoveries, Net	(107,767)	28,024
(Customer Credits)/Reserve at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	(58,412)	30,000
Amortization	236,948	108,013
Cost of Removal Expenditures	(61,660)	(39,333)
Other	(21,409)	(51,913)
Changes in Current Assets and Liabilities:
Accounts Receivables from Subsidiaries	(291,723)	(124,344)
Fuel, Materials, Supplies and REC Inventory	(19,495)	(42,494)
Taxes Receivable/Accrued, Net	56,519	64,076
Accounts Payable	(68,909)	(181,725)
Other Current Assets and Liabilities, Net	(44,758)	(42,386)
Net Cash Flows Provided by Operating Activities	371,940	411,416
Investing Activities:
Investments in Property, Plant and Equipment	(764,594)	(688,983)
Proceeds from Sales of Marketable Securities	90,409	79,818
Purchases of Marketable Securities	(76,182)	(68,360)
Investments in Unconsolidated Affiliates, Net	(113,856)	(34,127)
Other Investing Activities	5,976	7,135
Net Cash Flows Used in Investing Activities	(858,247)	(704,517)
Financing Activities:
Cash Dividends on Common Shares	(213,890)	(201,013)
Cash Dividends on Preferred Stock	(1,880)	(1,880)
Increase in Notes Payable	163,350	669,919
Repayment of Rate Reduction Bonds	(21,605)	(21,605)
Issuance of Long-Term Debt	1,300,000	350,000
Retirement of Long-Term Debt	(770,000)	(572,000)
Other Financing Activities	(26,087)	(19,666)
Net Cash Flows Provided by/(Used in) Financing Activities	429,888	203,755
Net Decrease in Cash and Restricted Cash	(56,419)	(89,346)
Cash and Restricted Cash - Beginning of Period	221,008	264,950
Cash and Restricted Cash - End of Period	$ 164,589	$ 175,604