Iowa is already a wind energy superstar, and now, the state’s largest utility is looking to completely transition to renewable energy sources. Des Moines-based MidAmerican Energy, owned by Berkshire Hathaway’s Warren Buffett, recently invested $3.6 billion for its 2,000 megawatt Wind XI project, that’s hailed as “the largest economic development project in Iowa’s history” as well as the nation’s largest wind energy project.The Des Moines Register reports that MidAmerican will install 1,000 wind turbines over the next few years on top of the 2,020 turbines the