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Now there’s a new way to make electricity from the heat differential between hot (warm) and cold water.  An American company with a Canadian past named Ergenics is making electricity using thermal mechanical pumps built with metal hydrides.  Metal hydrides can absorb hydrogen and they can act just like an expanding gas that produces pressure that can run a generator.

Well, I’m not sure I understand exactly how it works, but if I get the gist of it, you heat up this metal part with hot water and you cool off the other end and electricity is made which is in a way similar to a Stirling engine.  If you switch around the hot and the cold, the process is reversed.  They even have a water pump that is powered by the temperature differential between hot solar collectors and cold well water.  Pretty cool, check it out:

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