It's a waste heat to power conversion system! Make a really small hamster wheel and put a million of them on it walking the same direction. Now make a million of the hamster wheels and put the entire contraption in a smokestack. Voila! 10 KW of electricity!
Even better: induct the nano-hamsters into a nano-frat, and feed them mass quantities of nano-brewery beer. Being frat-hamsters, they're sure to emit quantities of methane. And being frat hamsters, they'll probably even light the methane themselves....