I have a champion tri-fuel that cost < $1k which runs essentially my whole house. It's plumbed into my natural gas so as long as that is up (it has never gone out), I don't even have to refill it.

I read somewhere that it's a big deal if a natural gas network runs out of gas because then air can get into the system. That can lead to explosions, so they have to systematically purge the entire network.

We have the same. $2K generator, while house transfer switch, natural gas hookup. Guess we'll never have a power failure again, since we just got a new generator.