General Motors has announced it will be increasing its renewable energy use by adding three acres of solar arrays at two local facilities.

GM's processing center in Swartz Creek and engine plant in Flint will be outfitted with 150-kilowatt, ground mount solar arrays which are expected to generate a combined 400,000 kilowatt hours of renewable energy per year to the facilities grids. According to GM, that's the equivalent to the annual energy use of 25 homes.

After the projects are completed, GM will use solar power at 13 facilities around the world. Other GM facilities in Michigan that utilize solar energy include the Detroit/Hamtramck Assembly, Orion Assembly and Technical Center in Warren. The projects are expected to be completed in the fall.