You are putting energy into the pavement when you walk pavegen tiles or not. You apply force to the pavement when you transfer your body weight from one foot to the foot hitting the pavement. The bonds in the molecules making up the pavement supply a reaction force by stretching ever so slightly, then relaxing back as you transfer weight to the other foot. Mechanical work is done to displace the atoms and stretch the bonds. I imagine they just use some sort of piezo device to utilize about the same energy with a somewhat larger displacement, so you likely wouldn't notice the difference. Seems it would be relatively high cost/Wh.
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