Natuurcafé La Port in the Netherlands recently installed a rotating door that captures kinetic energy generated by pedestrian traffic. Designed by architects RAU and built by Boon Edam, they claim the door is the first realization of this concept in the world generating roughly 4600 kwh of energy each year—granted it's not much but surely a step in the right direction.
via inhabitat
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I love it. Smart and Efficient !