I vaguely remember a TV movie from like... 2006 where some kind of solar storm /coronal mass ejection thing happens right as some hacker was trying to "HEY EVERYONE THIS SYSTEM IS VULNERABLE AND YOU SHOULD DO SOMETHING ABOUT IT BEFORE A BAD GUY TAKES CONTROL" type hack of the electrical grid, and the combination of the hack and solar radiation causing most of the US power grid to shut down

I haven't seen anything in real life to convince me the power gris isn't a prince ruperts drop that only works because it's never been shut down all at once before, and once it does that tail shatters and takes the rest with it.

In fact, living near a power substation that supplies a couple major things for a nearby city, I'm convinced the only reason there hasn't been a massive attack against it is because people just assume it's well protected.