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SECURITY DEPOSITS - Schedule of Security Deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Deposits Assets [Line Items]    
Security deposits $ 15,301 $ 23,855
Luminant Power Purchase Agreement collateral    
Deposits Assets [Line Items]    
Security deposits 0 12,554
Vistra Purchase and Sale Agreement collateral    
Deposits Assets [Line Items]    
Security deposits 0 3,063
Oncor Facility Extension security deposit related to Black Pearl Facility    
Deposits Assets [Line Items]    
Security deposits 6,269 6,269
Oncor Facility Extension security deposit related to Barber Lake Facility    
Deposits Assets [Line Items]    
Security deposits 8,297 0
Other deposits    
Deposits Assets [Line Items]    
Security deposits $ 735 $ 1,969