FILE-- This April 21, 2008, file photo shows wind turbines at the Harvest Wind Farm in Oliver Township, Mich. State officials say Michigan is positioned to require more of its electricity to come from wind and other renewable sources. Existing law sets a 10 percent target that must be met in 2015. Michigan officials will assess the impact on the state when President Barack Obama on Monday, June 2, 2014, announces tougher new air quality standards affecting coal-fired power plants. Coal produces about 55 percent of the electricity in the state while natural gas produces 11 percent. (AP Photo/Al Goldis, File)
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