v3.26.1
ACQUISITIONS AND STRATEGIC PARTNERSHIPS - Narrative (Details)
€ in Millions
 3 Months Ended 6 Months Ended
Apr. 29, 2026
USD ($)
a
MW
Feb. 20, 2026
USD ($)
Feb. 20, 2026
EUR (€)
Jan. 21, 2026
USD ($)
MW
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
shares
Jun. 30, 2025
USD ($)
Mar. 31, 2027
MW
Feb. 26, 2026
Feb. 20, 2026
EUR (€)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Business Combination [Line Items]                          
Partnership agreement, maximum ownership percentage                   50.00%      
Contingent consideration liability         $ 25,267,000   $ 25,267,000         $ 13,758,000 $ 8,138,000
Goodwill         89,719,000   89,719,000         $ 0  
Stock-based compensation expense         46,891,000 $ 54,656,000 $ 78,764,000 $ 103,771,000          
Performance-based restricted stock units                          
Business Combination [Line Items]                          
Granted (in shares) | shares             6,870,020            
Stock-based compensation expense         $ 23,585,000 $ 35,210,000 $ 38,337,000 $ 59,533,000          
Long Ridge                          
Business Combination [Line Items]                          
Business combination, voting equity interest acquired, percentage 100.00%                        
Megawatts of combined-cycle gas turbine capacity | MW 485                        
Number of contiguous acres | a 1,600                        
Total consideration $ 1,500,000,000                        
Long Ridge | Forecast                          
Business Combination [Line Items]                          
Megawatts of combined-cycle gas turbine capacity, increase amount | MW                 505        
Exaion acquisition                          
Business Combination [Line Items]                          
Total consideration   $ 174,500,000 € 148.0                    
Contingent consideration liability   11,800,000                 € 10.0    
Goodwill   92,500,000                 78.4    
Redeemable noncontrolling interest - Put Option   $ 13,000,000.0                 € 11.0    
Put option redemption percentage   1                 1    
Put option trading window   3 months                 3 months    
Business combination, noncontrolling interest   $ 89,116,000                      
Base noncontrolling interest   76,141,000                      
Stock-based compensation expense             $ 0            
Potential future equity infusion   129,700,000 110.0                    
Property and equipment   755,000                      
Exaion acquisition | Performance-based restricted stock units                          
Business Combination [Line Items]                          
Granted (in shares) | shares             0            
Exaion acquisition | Newly Issued Shares                          
Business Combination [Line Items]                          
Issued shares   135,600,000 115.0                    
Exaion acquisition | Existing Shares                          
Business Combination [Line Items]                          
Issued shares   $ 38,900,000 € 33.0                    
Mining Of The West, LLC                          
Business Combination [Line Items]                          
Total consideration       $ 25,200,000                  
Goodwill       $ 0                  
Megawatts of interconnect-approved capacity | MW       42                  
Property and equipment       $ 25,200,000