Grid and nuclear attack --> EMP attack
They seem to understate the problem. an nuclear or solar EMP attack does much more than take out electricity. It hits anything electronic -- grid, vehicles, computers, phones, the works. Nothing will work. No transportation, no food. That's why they project a 90% casualty rate.
And your Congress-critters and mine haven't done a thing to fix it, so far. Some of them think they're protected. Doubtful. And imagine, every nuclear plant will crash, just like Fukushima. Doomsday.