Well, to be honest we don't have this sort of situation very often. I recall a hurricane about 30 years ago being a pretty big problem, and the blizzard of 93, beyond that I can't think of it anything in the recent past. I was only 13-14 when both of those things happened, so I don't really recall it being a huge problem; in most cases power was restored fairly quickly from what I remember. I think this it's unlikely that major areas with stores like that will be heavily impacted or impacted for very long (most of that is near major transmission lines, and if damaged or down those would take top priority). The bigger issue as I see it is the flooding, combined with the amount of downed trees in non major thorough fares. Once flooding starts, it's pretty much the shits until it subsides, and nothing much anyone can do, with the trees, many if not most households have chainsaws, so yeah, community action! (I have 5 chainsaws, weird story but 2 of them were my granddads I inherited).
The best news is, in my experience, generally in this sort of situation people are on their best behavior and generally work together to try to get things back to normal as best as possible and as quickly as possible. You know, that way we can all go back to our day to day of bitching about each other and generally being pricks.