INVESTMENTS IN UNCONSOLIDATED AFFILIATES - Narrative (Details) $ in Thousands			1 Months Ended	3 Months Ended		12 Months Ended
	Feb. 12, 2024 USD ($)	Sep. 07, 2023 USD ($) a mile	Sep. 30, 2023 USD ($) turbine	Dec. 31, 2023 USD ($) project	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) project company	Dec. 31, 2022 USD ($) company	Dec. 31, 2021 USD ($)	Jan. 24, 2024
Schedule of Equity Method Investments [Line Items]
Equity in (Losses)/Earnings of Subsidiaries						$ 15,500	$ 22,900	$ 14,200
Dividends received from equity method investees						$ 20,100	26,200	21,600
Number of offshore wind projects | project				3		3
Payments to acquire investments						$ 1,680,473	742,496	327,385
Reduction of federal tax liability or generate tax refunds, period (in years)			24 months
Number of turbines | turbine			12
Investment tax credit, percent realized					0.10
Impairments of Offshore Wind Investments				$ 1,766,000	$ 401,000	2,167,000	$ 0	$ 0
Equity method investment, other than temporary impairment, after tax				$ 1,622,000	$ 331,000	1,953,000
Proceeds from sale, land, held-for-investment						$ 318,000
Number of companies that transmit hydro electricity imported from The Hydro-Quebec System in Canada | company						2	2
Subsequent Event
Schedule of Equity Method Investments [Line Items]
Investment tax credit, percent realized	0.10
Expected investment tax credit	$ 170,000
Sunrise Wind LLC | Subsequent Event
Schedule of Equity Method Investments [Line Items]
Negotiation period (in days)									90 days
Offshore Wind Business - North East Offshore And Bay State Wind
Schedule of Equity Method Investments [Line Items]
Carrying amount of equity method investments in excess of the underlying equity in net assets							$ 343,100
Basis difference							$ 168,900
Hydro-Quebec System
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)				14.50%		14.50%	14.50%
Payments to acquire investments						$ 9,600	$ 9,300
South Fork Wind Holdings, LLC Class A
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)			100.00%
Impairments of Offshore Wind Investments				$ 4,000
Offshore Wind Business
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)				50.00%		50.00%
Number of offshore wind projects | project				2		2
Impairments of Offshore Wind Investments				$ 1,766,000
Uncommitted Lease Area
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)		50.00%
Land subject to ground leases | a		175,000
Number of miles off south coast of Massachusetts | mile		25
Payments to acquire investments		$ 625,000
Tax Equity Capital Contribution Agreement
Schedule of Equity Method Investments [Line Items]
Payments to acquire investments			$ 528,000
Sunrise Wind LLC
Schedule of Equity Method Investments [Line Items]
Impairments of Offshore Wind Investments				$ 1,218,000
Sunrise Wind LLC | Subsequent Event
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)									50.00%
Sunrise Wind LLC | Orsted | Subsequent Event
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent of purchase price paid at closing (in percent)									0.50
Equity method investment, percent of remaining purchase price paid (in percent)									0.50
Renewable Energy Investment Fund
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)				90.00%		90.00%
Proceeds from sale of equity method investments						$ 147,600
Renewable Energy Investment Fund | Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Payments for charitable contributions						$ 20,000
South Fork Wind, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)				50.00%		50.00%
Northeast Offshore LLC and South Fork Class B Member, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)				50.00%		50.00%
Number of offshore wind projects | project				3		3
South Fork Wind And Revolution Wind | Subsequent Event
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)	50.00%
Proceeds from sale of equity method investments	$ 1,100,000
Cost sharing agreement, threshold amount	$ 240,000