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Acquisitions and Dispositions (Tables)
9 Months Ended
Sep. 30, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]  
Schedule of Asset Acquisitions
Project FacilityResource
Approximate Nameplate Capacity (MW)
LocationProjected/
Actual COD
PPA Contract Period
Projects Completed During the Nine Months Ended September 30, 2024
South CheyenneSolar150Laramie County, WY
Second quarter 2024
20 years
Projects Under Construction at September 30, 2024
Millers Branch
Phase I
Solar200Haskell County, TXFourth quarter 202520 years
Phase II
Solar180Haskell County, TXSecond quarter 202615 years
Phase III(*)
Solar
90Haskell County, TX
Fourth quarter 2026
15 years
(*)Subsequent to September 30, 2024, Southern Power committed to expand construction of Phase III by 42 MWs of capacity, substantially all of which is contracted under a 15-year PPA, with commercial operation projected to occur in the fourth quarter 2026. With the addition of the 42 MWs of capacity for Phase III, the Millers Branch project has a total of 512 MWs under construction.