solomon martin wrote:I have thought about using elevated water (or any form of potential kinetic energy) as a green alternative to batteries. Imagine installing a bio-kinetic harvester (such as a hydrostatic displacement pump, or a trickle ram pump attached to a turn-style or a door-hinge) in high foot traffic area like a colliseum or a subway station so that you could generate energy passively with human movement. Purely conceptual at this point, but I think the idea of using elevated water and bypassing the battery system is worth exploring.
Slightly different idea: how about using a wind mill (or any other suitable alternative energy device) to elevate a large pendulum as a kinetic battery?