Current technology EMP bombs would only directly impact all electronics/electrical items in a relatively small radius of probably less than 10 miles. If you were inside that radius you would be impacted but help from nearby could arrive rather quickly. It would take thousands of them to disable a large region for more than a short period of time.
FYI most critical military equipment is EMP "hardened" to survive this type of attack.
One EMP could disable a power plant which would impact a larger area with a power outage but would not damage individual electrical/electronic items beyond that smaller radius.
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