Bill Fehrman, the utility's CEO and president, announced the project Thursday at an event in Des Moines attended by Gov. Terry Branstad and other state officials. Officials say the wind farm will be the largest economic development project in the state's history.
Fehrman says when the project is completed, the utility will generate wind energy that equals 85 percent of its annual customer sales in Iowa. MidAmerican is the state's largest utility.
MidAmerican didn't release where the new turbines would be erected but says the utility will finalize locations while the Iowa Utilities Board considers the project.