Pioneer Prairie I Wind Farm, which is located in northeastern Iowa in Howard and Mitchell Counties, has an installed capacity of 198 MW - enough to power approximately 54,000 average Iowa homes annually. Construction of the wind farm’s 120 Vestas V82 1.65 MW turbines began in spring 2008 and the wind farm achieved commercial operation in December 2008. Tennessee Valley Authority purchases 115 MW of the energy generated at Pioneer Prairie I. The remaining 83 MW is sold into the regional wholesale market. The associated renewable energy credits are used by businesses and organizations to comply with state renewable energy mandates or to voluntarily reduce the environmental impact of their operations.

Pioneer Prairie II Wind Farm, the second phase of Pioneer Prairie, is located in Mitchell County, Iowa. With 62 Vestas V82 1.65 MW turbines, the wind farm has an installed capacity of 102 MW - enough to power 28,000 Iowa homes with clean energy each year. Construction began in the summer of 2008, and the wind farm achieved commercial operation in January 2009. The clean, renewable electricity generated by the wind farm will be sold into the regional wholesale market. AmerenUE purchases the clean renewable energy generated at the wind farm.