I remember the Nork map that showed the detonation of 3 nuke/emp devices over the US in such a pattern as to disable much if not most of our electrical grid. It matters not if those blasts would get every single coffeemaker. What matters is how many big ‘step down’ transformers got fried. Fry a few of those, that are made with a 18 month lead time in China, and you lose much of the grid for at least that long.
Interestingly enough, the one ‘scheduled’ for the central US was at a much lower latitude than the ones on the eastern and western seaboards. Presumably to ‘spare’ the shale operations in the dakotas and canada from disruption.
YMMV.
Do you remember when the Chinese came out with their map of nukes on American cities, and what it looked like?