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ACQUISITIONS AND DISPOSITIONS - Schedule of Asset Acquisitions (Details) - Southern Power
$ in Millions
2 Months Ended 12 Months Ended
Feb. 14, 2024
MW
Dec. 31, 2023
USD ($)
MW
Dec. 31, 2021
MW
Deuel Harvest      
Asset Acquisition [Line Items]      
Approximate Nameplate Capacity (MW)     300
Deuel Harvest | Maximum      
Asset Acquisition [Line Items]      
PPA Contract Period     25 years
Deuel Harvest | Minimum      
Asset Acquisition [Line Items]      
PPA Contract Period     15 years
Deuel Harvest | Deuel Harvest      
Asset Acquisition [Line Items]      
Ownership Percentage     100.00%
Millers Branch      
Asset Acquisition [Line Items]      
Approximate Nameplate Capacity (MW)   200  
Ownership Percentage   10000.00%  
PPA Contract Period   20 years  
Millers Branch | Maximum      
Asset Acquisition [Line Items]      
Addition to nameplate capacity   300  
Millers Branch | Maximum | Subsequent Event      
Asset Acquisition [Line Items]      
Addition to nameplate capacity 205    
South Cheyenne      
Asset Acquisition [Line Items]      
Approximate Nameplate Capacity (MW)   150  
Ownership Percentage   10000.00%  
PPA Contract Period   20 years  
South Cheyenne Solar Facility and Millers Branch Solar Development      
Asset Acquisition [Line Items]      
Payments to acquire businesses | $   $ 193