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I have seen many, many articles on how a solar flare could wipe our grid out and this could happen at any time, day or night. Luckily, we have scientists that monitor the sun and give us heads up if a flare is heading toward us. There are a few things you can do to prevent damage to your electrical gear and how to get ready for a solar storm.
These things could also apply to an EMP attack that is pretty much the same the thing but man made and still could wipe the grid away from us at any time. See the full article below: