That's getting to the point that it could literally be economic to run a small generator on natural gas, or that plus solar plus batteries. It would take too many $500-$1000 electric bills to really pay down some personal infrastructure.
I've also thought that if one could figure out some of the power electronics a wrecked Prius engine just ticking over at idle would probably provide most of your off-peak power and charge batteries and then during peak times it could just ramp up a bit. I've never heard of a natural gas conversion though so it would be a long road I suspect.