Explore Okoboji: Alliant Energy announced Friday that it has finalized an agreement with Apex Clean Energy for the Upland Prairie Wind Farm. The 121-turbine, 300-megawatt project will be located in Clay and Dickinson counties. Construction is to start in the spring of 2018. Alliant said the project, if it receives final approval, would result in one-third of its energy in Iowa coming from the wind starting in 2020.