My house's watt-hour meter cares, too. I recently got one of those for-fat-lazy-people, motorized exercisers at the flea market for $5., brought it home, plugged it in outside next to the watt-hour meter, and started pedaling, to fullfill a pipe dream that I'd often had and which can be done with any induction motor. The particular exerciser is very inefficient in its use of energy (due to its handlebars that get propelled back and forth also, etc.); so, overspeeding that motor enough to make the watt-hour meter stop and start creeping backwards a little bit requires my full output. I guesstimate that the few seconds during which I've succeeded, several times so far, in keeping it up (before a crank pin gets loose again each time), has recouped from the electric company a ten thousandth or so of my $5. investment.