MidAmerican Energy has released more details about a plan to add nearly 450 wind turbines across the state. Construction is underway on the projects around O’Brien, Webster, Grundy, Madison, and Marshall Counties. The utility has announced the blades for the expansion will be manufactured by a Siemen’s plant located in Fort Madison.

Once completed by the end 2015, MidAmerican officials say the new wind projects will generate enough electricity to power the equivalent of 317,000 Iowa households.