These mini wind turbines are designed for rooftops

A typical wind turbine is massive—roughly as tall as the Statue of Liberty, with blades that stretch wider than a football field. (Some are even bigger, like a new offshore turbine from Siemens that has a 774-foot-wide rotor.) By contrast, a new 10-by-10 foot turbine is relatively tiny. And without moving blades, it isn’t immediately recognizable as wind energy tech.…
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These mini wind turbines are designed for rooftops

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