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SECURITY DEPOSITS - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Deposit Assets [Line Items]    
Security deposits $ 15,301 $ 23,855
Luminant Power Purchase Agreement collateral    
Deposit Assets [Line Items]    
Security deposits 0 12,554
Vistra Purchase and Sale Agreement collateral    
Deposit Assets [Line Items]    
Security deposits 0 3,063
Oncor Facility Extension security deposit related to Barber Lake Facility    
Deposit Assets [Line Items]    
Security deposits $ 8,297 $ 0