There’s an old story about Thomas Edison installing a turnstile at his property after people began to visit in large numbers.

The Turnstile was stiff, hard to rotate. People had to work to force their way through.

Years later, he revealed that each turn of the turnstile pumped several gallons of water to the rooftop storage tank.

I have working drawings of a large hamster-wheel arrangement to drive a generator, but my brother refuses to make his doggies do the labor.