MidAmerican Energy Co. announced construction of a wind farm project to begin this month in Grundy County. The Ivester Wind Farm includes 35 Siemens Gamesa wind turbines as part of MidAmerican Energy’s Wind XI project, the company said in a statement. When completed at the end of 2018, MidAmerican said the Ivester Wind Farm will add 90.8 megawatts of wind generation capacity — enough to power more than 38,000 average Iowa homes. The wind farm will add approximately $875,000 in estimated average annual property taxes in Grundy County.