German engineers shrank a wind turbine to the size of a satellite dish and under 44 pounds, and their single blade rooftop turbine just became the first of its kind to pass full independent certification

On a slim mast above a roof, a lone white blade sweeps around in the breeze, small enough to look almost like a toy. The whole machine is about the size of a satellite dish. You could lift it down with one hand, under 44 pounds in all. It hums along softly, feeding a trickle of power down ... Read more