ACQUISITIONS AND DISPOSITIONS - Schedule of Construction Projects (Details) - Southern Power - MW	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2022	Dec. 31, 2021
Garland Solar Storage
Business Acquisition [Line Items]
Approximate Nameplate Capacity (MW)		88	88
PPA Contract Period		20 years
Nameplate capacity placed in service (in MWs)		15	73
Tranquility Solar Storage
Business Acquisition [Line Items]
Approximate Nameplate Capacity (MW)		72	72
PPA Contract Period		20 years
Nameplate capacity placed in service (in MWs)			32
Tranquillity Solar Storage
Business Acquisition [Line Items]
Nameplate capacity placed in service (in MWs)		40
Millers Branch Solar Development Phase 1
Business Acquisition [Line Items]
Approximate Nameplate Capacity (MW)	200
PPA Contract Period	20 years
Millers Branch Solar Development Phase 2
Business Acquisition [Line Items]
Approximate Nameplate Capacity (MW)	180
PPA Contract Period	15 years
Millers Branch Solar Development Phase 3
Business Acquisition [Line Items]
Approximate Nameplate Capacity (MW)	132
PPA Contract Period	15 years
South Cheyenne Solar Facility
Business Acquisition [Line Items]
Approximate Nameplate Capacity (MW)	150
PPA Contract Period	20 years