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ALABAMA POWER CO

For the period ended Mar 31, 2026. Filed Apr 30, 2026.

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About this filing

A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Mar 31, 2026 · Filed Apr 30, 2026

SO$93.57+1.3%Stored close · as of Nov 9, 2026

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Contents

Acquisitions and Dispositions

(K)ACQUISITIONS AND DISPOSITIONS

See Note 15 to the financial statements in Item 8 of the Form 10-K for additional information.

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.

ProjectFacilityResourceApproximateNameplate Capacity(MW)LocationActual/ProjectedCODPPAContractPeriod
Projects Under Construction at March 31, 2026
Millers Branch
Phase IISolar180Haskell County, TXSecond quarter 202615 years
Phase IIISolar132Haskell County, TXFourth quarter 202615 years
Projects Completed During the Three Months Ended March 31, 2026
Millers Branch
Phase ISolar200Haskell 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 FacilityResourceApproximate NameplateCapacity(MW)LocationProjectedCompletion Date
Projects Under Construction at March 31, 2026
Kay(*)Wind200Kay County, OKThird quarter 2026
GrantWind152Grant County, OKFourth quarter 2026
Grant PlainsWind147Grant County, OKFourth quarter 2026
WakeWind257Crosby & Floyd Counties, TXSecond 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 wasimmaterial. The ultimate outcome of these matters cannot be determined at this time.

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.