SOUTHERN POWER
Southern Power expands Millers Branch Solar Facility in Texas

Southern Power, a leading U.S. wholesale energy provider and subsidiary of Southern Company, today (May 1) announced the expansion of its 29th solar project Millers Branch Solar Facility. The Phase II expansion represents an additional 180-megawatts (MW) from the current Phase I 200 MW facility that is nearing the start of construction. The project has the potential to expand up to a total of approximately 500 MWs.

"We are thrilled to announce the expansion of our Millers Branch Solar Facility," said Southern Power President Robin Boren. "This 180 MW renewable energy expansion represents a clean, innovative solution to help a diverse group of customers achieve meaningful progress on their own sustainability objectives. It's one more example of how Southern Power is building the future of energy and meeting the evolving needs of our customers and communities."

The project, located in Haskell County, Texas, contributes to the company's growing renewable fleet of clean generating assets from California to Maine. Southern Power will lead the continued development and construction of both phases of Millers Branch. Phase II is expected to achieve commercial operation in the second quarter of 2026.

Cisco, Juniper Networks, IDEXX Laboratories, Inc., Cadence, Bio-Rad, PTC and a large healthcare company, with support from Sustainability Roundtable Inc., and together as members of the Net Zero Consortium for Buyers, each signed power purchase agreements with Southern Power for all the environmental attributes, such as renewable energy credits (RECs), produced by the 180 MW Phase II portion of the Millers Branch Solar Facility.

With the addition of Millers Branch Phase II, Southern Power's solar portfolio consists of more than 2,920 MW of solar generation currently operating or under construction. Southern Power's solar facilities are a part of the company's 5,450 MW renewable fleet, which consists of 30 solar and 15 wind facilities currently operating or under construction.

This project aligns with Southern Power's overall business strategy of strengthening its wholesale business by acquiring and developing generating assets that are covered by long-term contracts with counterparties with strong credit support.

About Southern Power
Southern Power, a subsidiary of Southern Company, is a leading U.S. wholesale energy provider meeting the electricity needs of municipalities, electric cooperatives, investor-owned utilities and other energy customers. Southern Power and its subsidiaries, some of which are owned in part with various partners, own or operate 55 facilities operating or under development in 15 states with more than 13,000 MW of generating capacity in Alabama, California, Delaware, Georgia, Kansas, Maine, Nevada, New Mexico, North Carolina, Oklahoma, South Dakota, Texas, Washington, West Virginia and Wyoming.

About Southern Company
Southern Company (NYSE: SO) is a leading energy provider serving 9 million customers across the Southeast and beyond through its family of companies. Providing clean, safe, reliable and affordable energy with excellent service is our mission. The company has electric operating companies in three states, natural gas distribution companies in four states, a competitive generation company, a leading distributed energy distribution company with national capabilities, a fiber optics network and telecommunications services. Through an industry-leading commitment to innovation, resilience and sustainability, we are taking action to meet customers' and communities' needs while advancing our goal of net zero greenhouse gas emissions by 2050. Our uncompromising values ensure we put the needs of those we serve at the center of everything we do and are the key to our sustained success. We are transforming energy into economic, environmental and social progress for tomorrow. Our corporate culture and hiring practices have earned the company national awards and recognition from numerous organizations, including Forbes, The Military Times, DiversityInc, Black Enterprise, J.D. Power, Fortune, Human Rights Campaign and more. To learn more, visit www.southerncompany.com.

Cautionary Note Regarding Forward-Looking Statements:
Certain information contained in this release is forward-looking information based on current expectations and plans that involve risks and uncertainties. Forward-looking information includes, among other things, statements concerning the construction and subsequent operation of the Millers Branch Solar Facility, including the expected commercial operation date for the Phase II expansion and potential further expansion opportunities. Southern Company and Southern Power caution that there are certain factors that can cause actual results to differ materially from the forward-looking information that has been provided. The reader is cautioned not to put undue reliance on this forward-looking information, which is not a guarantee of future performance and is subject to a number of uncertainties and other factors, many of which are outside the control of Southern Company and Southern Power; accordingly, there can be no assurance that such suggested results will be realized. The following factors, in addition to those discussed in each of Southern Company's and Southern Power's Annual Reports on Form 10-K  for the year ended December 31, 2023, and subsequent securities filings, could cause actual results to differ materially from management expectations as suggested by such forward-looking information: the ability to control costs and avoid cost and schedule overruns during the development, construction and operation of facilities, to construct facilities in accordance with the requirements of permits and licenses, to satisfy any environmental performance standards and the requirements of any tax credits and other incentives, and to integrate facilities into the Southern Company system upon completion of construction; performance of counterparties under ongoing renewable energy partnerships and development agreements; potential business strategies, including acquisitions or dispositions of assets or businesses, which cannot be assured to be completed or beneficial to Southern Company or Southern Power; and catastrophic events such as fires, earthquakes, explosions, floods, tornadoes, hurricanes and other storms, droughts, pandemic health events, political unrest, wars, or other similar occurrences. Southern Company and Southern Power expressly disclaim any obligation to update any forward-looking information.