My idea:
Get a hamster.
Put hamster in cage.
Rig cage to generator.
Hamster makes cage spin.
Cage makes generator spin.
Easy.

Hmmmm.... human or hamster power... seems perfect, but there's the energy required to feed, clothe and house human or hamster (yes, clothes for the hamsters- never dressed up a hamster?)...
Then there's the CO2 produced by all that industry, as well as by the exertion... perpetual motion, it ain't.
T.A.N.S.T.A.A.F.L. , my friends...
But I've often thought: what if every door, turnstile, and stairway in just the NYC mass transit system were rigged to generate energy from human passage? Be expensive to implement and maintain, but I'll bet there's a hell of a lot of energy going to waste there. And the heat down in the subway- Kee-ripes!! If only that could be tapped...
But yes, the Katahu-wheel thing makes sense on other grounds: from the look of that avatar, he could stand to dissipate some excess energy...
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