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Acquisitions and Dispositions
 3 Months Ended
Mar. 31, 2026
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.
Southern Power
Construction Projects
During the three months ended March 31, 2026, Southern Power completed construction of and placed in service the 200-MW first phase and continued construction of the 180-MW second phase and 132-MW third phase of the Millers Branch solar facility. At March 31, 2026, the total cost of construction incurred for the Millers Branch
project was $692 million, of which $387 million remains in CWIP. The ultimate outcome of these matters cannot be determined at this time.
Project
Facility		Resource
Approximate
Nameplate Capacity
(MW)
LocationActual/Projected
COD		PPA
Contract
Period
Projects Under Construction at March 31, 2026
Millers Branch
Phase II
Solar180Haskell County, TXSecond quarter 202615 years
Phase III
Solar
132Haskell County, TX
Fourth quarter 2026
15 years
Projects Completed During the Three Months Ended March 31, 2026
Millers Branch
Phase I
Solar200Haskell County, TXFebruary 202620 years
Wind Repowering Projects
During the three months ended March 31, 2026, Southern Power continued the development projects to repower the Kay, Grant, Grant Plains, Wake, and Bethel wind facilities. At March 31, 2026, the total cost of construction incurred related to the projects was $432 million, which is primarily 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
Completion Date
Projects Under Construction at March 31, 2026
Kay(*)
Wind
200
Kay County, OK
Third quarter 2026
Grant
Wind
152
Grant County, OK
Fourth quarter 2026
Grant Plains
Wind
147
Grant County, OK
Fourth quarter 2026
Wake
Wind
257
Crosby & Floyd Counties, TX
Second quarter 2027
BethelWind276Castro County, TXThird quarter 2027
(*)The facility has a total capacity of 299 MWs, of which 200 MWs is projected to be repowered and is contracted under a PPA. During the first quarter 2026 and subsequent to March 31, 2026, Southern Power placed 51 MWs of repowered capacity in service.
Natural Gas Turbine Upgrade Projects
During the three months ended March 31, 2026, Southern Power committed to projects to upgrade certain turbines at its existing Franklin and Wansley natural gas facilities, located in Lee County, Alabama and Heard County, Georgia, respectively. The upgrades are projected to add up to 400 MWs of incremental capacity, with commercial operations projected to begin between the second quarter 2029 and the first quarter 2031. At March 31, 2026, the total cost of construction incurred related to the projects was immaterial. The ultimate outcome of these matters cannot be determined at this time.