Ameren Missouri has acquired the 300MW Atchison wind farm complex from Invenergy for an undisclosed price.
The project is being built in stages with 100MW currently operational.
A further 50MW to 75MW will be online by the end of March, with the remaining capacity to be operational later in the year.
The remaining portions are still being constructed by Invenergy.
Atchison, along with the 400MW High Prairie project that Ameren Missouri began operating in December, will add 700MW of in-state wind generation to the grid.
The total investment in these two projects is approximately $1.1bn, the company said.
Ameren Missouri chairman and president Marty Lyons said: “Ameren Missouri is taking major steps forward in our transformation to clean energy with the addition of these two large facilities.
“We’re planning for the long term with deep carbon reductions to achieve our goal of net-zero carbon emissions by 2050.”
The company recently released plans to invest approximately $4.5bn in 3.GW of renewable generation by 2030, including the Atchison and High Prairie renewable energy centres.
Ameren Missouri chief renewable development officer Ajay Arora said: “Missouri-based clean energy is good for our customers, the environment and the economy.
“The ongoing operation of these facilities is the next step in getting the energy we provide as clean as we can, as fast as we can, without compromising on reliability or affordability.”