We will make electricity so cheap that only the rich will burn candles. — Thomas Edison
I recall going to a science centre as a child and seeing a stationary bike hooked up to a generator and lightbulb. Museum patrons could do a bit of cycling and watch as the light burned brightly. Nowadays, cycling powers exercise bikes’ onboard computers and “regular” bikes can be hooked up to generators at the cost of a few hundred dollars. Now, before I continue, I must stress that the thought experiment proposed should remain as such — a thought experiment — and no more. It would likely fail on both an economic and environmental basis in the context discussed.