CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Activities:
Net Income	$ 493,039	$ 445,326
Adjustments to Reconcile Net Income to Net Cash Flows (Used In)/Provided by Operating Activities:
Depreciation	312,955	289,330
Deferred Income Taxes	149,197	67,557
Uncollectible Expense	22,821	17,135
Pension, SERP and PBOP Income, Net	(24,563)	(40,642)
Pension Contributions	(1,100)	(26,100)
Regulatory Under Recoveries, Net	(158,964)	(107,767)
Customer Credits at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	0	(58,412)
Amortization	(76,059)	236,948
Cost of Removal Expenditures	(70,514)	(61,660)
Other	(54,486)	(21,409)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(225,609)	(291,723)
Taxes Receivable/Accrued, Net	284	56,519
Accounts Payable	(258,476)	(68,909)
Other Current Assets and Liabilities, Net	(39,368)	(64,253)
Net Cash Flows (Used In)/Provided by Operating Activities	69,157	371,940
Investing Activities:
Investments in Property, Plant and Equipment	(977,144)	(764,594)
Proceeds from Sales of Marketable Securities	64,307	90,409
Purchases of Marketable Securities	(56,508)	(76,182)
Investments in Unconsolidated Affiliates	(87,845)	(113,856)
Other Investing Activities	5,640	5,976
Net Cash Flows Used in Investing Activities	(1,051,550)	(858,247)
Financing Activities:
Cash Dividends on Common Shares	(229,405)	(213,890)
Cash Dividends on Preferred Stock	(1,880)	(1,880)
(Decrease)/Increase in Notes Payable	(246,700)	163,350
Repayment of Rate Reduction Bonds	(21,605)	(21,605)
Issuance of Long-Term Debt	1,550,000	1,300,000
Retirement of Long-Term Debt	(400,000)	(770,000)
Other Financing Activities	(27,002)	(26,087)
Net Cash Flows (Used in)/Provided by Financing Activities	623,408	429,888
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(358,985)	(56,419)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	521,752	221,008
Cash and Restricted Cash - End of Period	$ 162,767	$ 164,589