Obviously, one has to stock up on gasoline before hand, or be ready to siphon some from a car. It would not be long-term, only for some comfort until power is restored.
It's tough if one is stuck in the city. But if in the suburb, I would think keeping the fridge running a few hours a day to keep the food from spoiling would be good. Also, it's to have power to charge a battery for some lighting at night, or to run a microwave to prepare food. I don't think I would run the genny 24 hrs/day.
As said earlier, we never have to prepare for anything like this in the SW. The only serious problem for me would be being out of power in a heatwave, and the only way to survive would be to get out of town. Here, when people's home A/C quits in the summer, they have to leave home to check into a motel. That's about the only hazard that has happened in my almost 40 years living here.