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“I ’m an engineer. Not an environmentalist,” says Michael Polsky, as if to explain why even after spending 17 years developing renewable-energy systems, he’s still enthralled by the sight of 125-foot-long wind turbine blades sweeping in elegant circles through the sky. It’s machines that this serial entrepreneur loves. And building. And making profitable deals. After becoming a centimillionaire by developing gas-fired turbines, the 71-year-old has ridden wind power to billionaire status. We’re touring the Grand Ridge Energy Center, a renewable energy complex that Polsky’s private company, Invenergy , built and owns 80 miles southwest of its Chicago headquarters. He eagerly shows off h... Full story

29 November