The 52MW project, which will be the state’s largest solar facility upon completion, is designed to generate electricity required to power approximately 8,000 homes.
Mississippi Power plans to use all energy and associated renewable energy credits produced by the facility to serve customers with solar energy or sell to third parties.
Mississippi Power president and CEO Anthony Wilson said: "By working with Origis Energy and the Area Development Partnership, we will have nearly doubled the amount of electricity generated by renewable energy going to the Mississippi Power grid."
Spread across 590 acres, the Lamar County solar facility will feature more than 215,000 polycrystalline solar panels.
Expected to create up to 100 jobs during construction phase, the facility is planned to be commissioned in the first quarter of 2017.
Power generated from the solar facility will be sold under 25-year power purchase agreement.
Lamar County Supervisor Dale Lucus said: "This solar project is a great fit for Lamar County and the tax revenue from the project will greatly benefit the county and the local school system.
"We appreciate Origis Energy’s investment here in this great county and we look forward to partnering with them for many years on the largest solar installation in the state of Mississippi."
Mississippi Power expects the Lamar County facility to help diversify its power generation portfolio.
In April 2016, Mississippi Power and Silicon Ranch announced the groundbreaking ceremony of 50MW utility-scale solar project in Hattiesburg.
