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The Skystream home windmill starts cranking out electricity in scant 8mph winds. Its 12-foot-long blades allow it to hit maximum output (1.7 kilowatts, 30 to 90 percent of most homes’ needs) at 20 mph and keep its noise on par with an air conditioner. Installation is easy, with all electrical parts contained in the turbine body. And you can sell extra watts to your utility company to fund that solar-panel project. About $10,000; windenergy.com
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