Remaining interest in the project will be owned by an affiliate of First Solar.
Southern Company chairman, president and CEO Thomas A. Fanning said: "Southern Company continues to strategically develop solar renewable projects across the country.
"By further diversifying our energy mix – and expanding our partnership with First Solar – we are demonstrating our commitment to provide clean, safe, reliable and affordable power for America’s future."
The Lost Hills-Blackwell Solar Facility spans two sites – the 20-MW Lost Hills Solar Facility and the 12-MW Blackwell Solar Facility in Kern County, consisting of more than 454,000 of First Solar’s advanced technology PV solar modules.
Lost Hills-Blackwell will produce sufficient energy to power more than 11,000 homes in its first year.
First Solar vice president of project development for the Western United States Brian Kunz said: "This deal builds on our continued strong relationship with Southern Company, and we’re proud to further enhance the partnership.
"In addition to assets Southern Power has acquired from First Solar, we have worked together directly on construction and supply of technology for projects across the United States."
Construction of the project commenced in April 2014, and is expected to be completed shortly after this acquisition. The facility will be operated and maintained by First Solar.
Output by the facility will be sold under long-term power purchase agreements with Pacific Gas and Electric Company (PG&E) and Roseville Electric.
