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INVESTMENTS IN UNCONSOLIDATED AFFILIATES - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jul. 09, 2024
USD ($)
Feb. 13, 2024
USD ($)
Sep. 07, 2023
USD ($)
a
mile
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2024
USD ($)
project
company
Dec. 31, 2023
USD ($)
company
Dec. 31, 2022
USD ($)
Jan. 24, 2024
Schedule of Equity Method Investments [Line Items]                      
Unrealized gain associated with investment               $ 51,900 $ 15,500 $ 22,900  
Dividends received from equity method investees               $ 20,500 20,100 26,200  
Number of offshore wind projects | project               3      
Payments to acquire investments               $ 929,688 1,680,473 742,496  
Investments in Unconsolidated Affiliates           $ 660,473   168,652 660,473    
Investment tax credit, percent realized   0.10                  
Expected investment tax credit   $ 170,000                  
Equity method investment, other-than- temporary impairment           1,766,000 $ 401,000 $ 464,019 2,167,000 $ 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    
South Fork Wind Holdings, LLC Class A                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest (in percent)       100.00%              
Investment tax credit               $ 459,000      
Investments in Unconsolidated Affiliates           481,000     $ 481,000    
Equity method investment, other-than- temporary impairment           4,000          
Offshore Wind Business                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest (in percent)               50.00%      
Investments in Unconsolidated Affiliates           515,500   $ 22,200 515,500    
Equity method investment, other-than- temporary impairment           1,766,000          
Northeast Offshore LLC and South Fork Class B Member, LLC                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest (in percent)               50.00%      
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]                      
Ownership interest (in percent)       100.00%              
Payments to acquire investments       $ 528,000              
Sunrise Wind, LLC                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest (in percent) 50.00%                   50.00%
Investments in Unconsolidated Affiliates           (519,000)     $ (519,000)    
Proceeds from sale of equity method investments $ 118,000       $ 377,000     $ 377,000      
Equity method investment, other-than- temporary impairment           $ 1,218,000          
Sunrise Wind, LLC | Orsted                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest (in percent) 50.00%                    
Proceeds from sale of equity method investments $ 152,000                    
Sunrise Wind, LLC | Orsted                      
Schedule of Equity Method Investments [Line Items]                      
Equity method investment, remaining purchase price paid $ 34,000                    
South Fork Wind, LLC                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest (in percent)           50.00%   50.00% 50.00%    
Renewable Energy Investment Fund                      
Schedule of Equity Method Investments [Line Items]                      
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    
Hydro-Quebec System                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest (in percent)           14.50%   14.50% 14.50%    
Payments to acquire investments               $ 11,500 $ 9,600    
South Fork Wind And Revolution Wind                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest (in percent)   50.00%     50.00%            
Proceeds from sale of equity method investments   $ 1,100,000     $ 745,000            
Adjustments from sale of equity method investment         375,000            
Adjustment from sale of equity method investment, capital expenses         150,000            
Adjustments from sale of equity method investment, non-construction costs         225,000            
Cost sharing agreement, threshold amount         240,000            
Equity method investment, realized gain (loss) on disposal               $ 524,000      
Equity method investment, aggregate cost         350,000            
Equity method investment, post-closing sale costs         326,000            
Effective income tax rate reconciliation, change in enacted tax rate, amount         60,000            
Equity method investment, liability obligations         365,000            
Investment tax credit, percent   40.00%                  
South Fork Wind And Revolution Wind | Current Derivative Liabilities                      
Schedule of Equity Method Investments [Line Items]                      
Equity method investment, liability obligations         $ 15,000