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Acquisitions and Dispositions
 6 Months Ended
Jun. 30, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]  
Acquisitions and Dispositions ACQUISITIONS AND DISPOSITIONS
See Note 15 to the financial statements in Item 8 of the Form 10-K for additional information.
Alabama Power
On June 6, 2025, the FERC approved Alabama Power's acquisition of Tenaska Alabama Partners, L.P., which owns and operates the Lindsay Hill Generating Station. The ultimate outcome of this matter cannot be determined at this time. See Note (B) under "Alabama Power – Petition for Certificate of Convenience and Necessity" for additional information.
Mississippi Power
On June 19, 2025, the Florida PSC issued a final order approving the transfer of FP&L's 50% ownership interest in Plant Daniel Units 1 and 2 to Mississippi Power. On July 30, 2025, Mississippi Power completed the acquisition of FP&L's 50% interest in Plant Daniel Units 1 and 2 and, as part of the acquisition, received approximately $36 million from FP&L. See Note 2 to the financial statements under "Mississippi Power – Plant Daniel" in Item 8 of the Form 10-K for additional information.
Southern Power
Construction Projects
During the six months ended June 30, 2025, Southern Power continued construction of the three phases of the 512-MW Millers Branch solar facility. At June 30, 2025, the total cost of construction incurred for the Millers Branch project was $537 million, which is primarily included in CWIP. The ultimate outcome of these matters cannot be determined at this time.
Project FacilityResource
Approximate Nameplate Capacity
(MW)
Location
Projected COD
PPA Contract Period
Projects Under Construction at June 30, 2025
Millers Branch
Phase I
Solar200Haskell County, TXFourth quarter 202520 years
Phase II
Solar180Haskell County, TXSecond quarter 202615 years
Phase III
Solar
132Haskell County, TX
Fourth quarter 2026
15 years
Wind Repowering Projects
During the six months ended June 30, 2025, Southern Power continued the development project to repower the Kay Wind facility. In addition, Southern Power committed to development projects to repower the Grant Plains, Grant Wind, and Wake Wind facilities. At June 30, 2025, the total cost of construction incurred related to the projects was
$89 million and is included in CWIP. The repowered output of the facilities is contracted under new and amended PPAs. The ultimate outcome of these matters cannot be determined at this time.
Project FacilityResource
Approximate Nameplate Capacity
(MW)
Location
Projected COD
Projects Under Construction at June 30, 2025
Kay Wind(*)
Wind
200
Kay County, OK
Third quarter 2026
Grant Plains
Wind
147
Grant County, OK
Fourth quarter 2026
Grant Wind
Wind
152
Grant County, OK
Fourth quarter 2026
Wake Wind
Wind
257
Crosby & Floyd Counties, TX
Second quarter 2027
(*)The facility has a total capacity of 299 MWs, of which 200 MWs is projected to be repowered and is contracted under an amended PPA.