We have 12 to 48 hours of warning, coronal mass ejections don’t move at the speed of light. Induced voltage is proportional to length of conductor. So pull all the breakers in your house, unplug everything and you should be okay. If you’re worried about phones or whatnot wrap them in aluminum foil (to form a Faraday Cage) and lean them against a water pipe. You’ll be fine.
For the electrical grid, they are going to need to disconnect it into shorter segments. Reconnecting the segments and synchronizing the grid will be a huge pain in the ass, but not impossible. Yes, we will take some damage, but it won’t be catastrophic. All the fiber optic stuff will be fine, the glass doesn’t conduct.
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