“Utilities would be up again quickly”
Actually, I don’t think so. Reasons:
1. Government moves slow. They are still cleaning up in New Jersey from that hurricane.
2. The means of production themselves would be taken out. You can’t replace Part X if Part Machine Y is also broken. And every component has to be made by another machine, all broken. And you have to have electricity to run the machines, even if they aren’t.
3. Most transportation would be gone. Say goodbye to any vehicle after about 1980 or so.
Most of the people who think about this stuff say it would be a total disaster, and perhaps take a decade to reach even some semblance of normality.
Pray it doesn’t happen.