With this expiration looming, the future of the industry in Illinois — one of the top producers of wind energy in the nation — could leave the state struggling to meet its renewable energy requirements, even as the state exports more wind energy than it uses. With 1,500 turbines in operation and about the same number in permitting stages, Illinois's wind industry also has thrived because of an electric grid ideal for carrying power into Chicago and exporting it to Midwestern and Eastern states and the state’s renewable-energy requirements...

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