MidAmerican Energy began installing wind turbines in 2004 and is No. 1 in the nation in ownership of wind-powered capacity among rate-regulated utilities.

In December 2010, MidAmerican Energy announced it would add 593.4 megawatts of new wind-powered generation in Iowa. The projects included the 443.9-megawatt Rolling Hills wind project, located in Adair, Adams and Cass counties; the 119.6-megawatt Laurel wind project, located in Marshall County; and the 29.9-megawatt Pomeroy wind expansion project, located in Pocahontas and Calhoun counties. The final portion of the 593.4-megawatt expansion project was placed in-service by year-end 2011.