If you were in my area this would be a several times a year occurrence.
The easy answer is to have a stand-by propane generator. Guessing that would be about 5K + fuel.
Pull-start gas generators need occasional attention so they will start when you need them....but are much cheaper.
What's the dollar value of the lost food and lost business?
We had a gas-powered generac inverter that IIRC cost ~$500 that can power three fridges and a freezer as well as some lights. You'd have to run cords to each appliance.