electricity

So this article “Remote uses no power” makes me wonder how much power is actually generated. I mean if I replaced all my floors in my house with something like this, what would it power? Or what if every peice of exercise equipment in a gym also produced energy? How much would that be? It also reminds me of an idea that I sketched out about 10+ years ago where you would wear a suit that generated electricty from your movements (i.
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