You should bill them for the diesel your generator burns when the lights go out.>6KW diesel generator (light tower like you see at construction projects) and a manual transfer switch in the main panel
>Solar intertie with commercial power (My solar offsets my consumption over a full year, plus I have two, 15 Amp, 120V (180W) circuits that supply me directly)
>Gravity water from a spring
>Gravity septic system
>Wood heat (and an unrestricted supply of firewood) and we can cook on the wood stove
>Propane barbeque and lots of bottles
Our power goes out a least once a year, and stays out between several hours and many days. We are near the end of the line here, and very low priority when the grid has storm damage. We do just fine without commercial power for days or weeks.