Primoris Services Corp. will mechanically construct the new Unit 4 at the Grand River Energy Center (GREC) in Chouteau, Oklahoma. The project will employ simple cycle gas turbine technology to meet the needs of the Grand River Dam Authority’s (GRDA) evolving grid, replacing the center’s last remaining coal-fired unit and supplementing wind power production.
Unit 4 will be a fast-start, 426 MW Mitsubishi Power 501JAC gas turbine. It will be the first of its kind to operate in simple cycle in the U.S., providing operational flexibility and fast start-up times.
Unit 4 will also include the world’s largest selective catalytic reduction system, crucial for reducing nitrogen oxide emissions and ensuring compliance with environmental standards.
“The inclusion of the Mitsubishi 501JAC turbine, coupled with the substantial selective catalytic reduction system, is ideal for today’s dynamic energy landscape,” said Michael Johnson, director of projects with Primoris’ Energy segment.
Simple cycle power plants can supplement renewable energy sources through their ability to start and stop quickly, allowing their use during peak load times, resulting in grid stabilization and lowered reliance on fossil fuels.
The GREC Unit 4 project is set to generate significant economic and environmental benefits for the Chouteau, Oklahoma area, supporting local jobs during construction and providing a stable energy source for businesses and communities.



