The energy you expend at the gym, on the nightclub dancefloor, and now, pushing a revolving door are sources for capturing electrical energy that is reusable.Fluxxlab, a design firm aiming to convert small amounts of human energy into electricity has created The Revolution Door and Powerslide, two p... Read more
Harvesting the kinetic energy generated by crowds of people is one of our favorite approaches to renewable energy. Recently Netherlands-based Natuurcafé La Port installed an energy generator in a rotating door, so every time someone walks in for a cup of
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Saw this idea on the amazing Half-Bakery site, which lists crap ideas, and I highly recommend. Someone on there says Eddison had a front door genny.
Works just as well on normal doors, not sure if they would be that efficient though.
Been invented, just not implemented everywhere yet.