The two flexible gas power plant projects could be as large as 450 MW each.
The combined-cycle plant will operate using natural gas, with Southern Company saying the plant has already provided natural gas-fired power for almost three years.
The service agreement includes engineering, procurement and licensing support from Westinghouse, as well as access to Westinghouse intellectual property.
The company originally hoped to have a decision ready by this week’s shareholder meeting, though Fanning now hopes to have an evaluation of the project completed by late summer.
Lamesa is now the third large-scale solar project owned by Southern in the state.
Under the deal, Toshiba’s liabilities will be capped at $3.6 billion and will be payable over the next three years.
The plant was being constructed by Toshiba’s now-bankrupt Westinghouse subsidiary.
The activation of the 1,000-acre, 1.2-million panel development gives Southern Power three solar projects in Texas.
About half way through the spring 2016 outage at the Alvin W. Vogtle electric generating station in eastern Georgia, workers were ahead of schedule and gaining momentum.
The research will develop ways to accelerate solar panel aging in a laboratory without having to wait 25 to 30 years. The eventual goal is to compare panels that have been aged artificially with panels that have aged naturally.