In before the cries of Fear Mongering and the EMP is complete fantasy crowd.
EMP threat is a real impending threat.
Even more risk is the poor state of infomation security vulnerability of power plant ICS SCADA systems.
The USA is a house of cards compound.
EMP is real, but as an electronics engineer who has designed satellite electronics that had to withstand it, it isn’t going to blow up your wristwatch, your computer, or even your car. A high-altitude EMP 400km over Kansas would probably disable the American electrical grids for years, maybe permanently, and maybe 50% - 90% of the population would eventually die. But there still would be functioning cars, trucks, refineries, computers, wristwatches, etc.