The blades started turning this week at Michigan's first commercial wind farm, and backers say the project will generate enough power for 15,000 homes. Harvest Wind Farm, owned by John Deere Wind Energy, consists of 32 turbines scattered across 3,200 acres of farmland in Huron County, Mich. The project cost almost $100 million, and local farmers will receive annual royalties for each tower installed on their land.

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