Not that an EMP is not on my radar of things to worry about but the below is worthy of a read even though similar has been discussed here in the past.

The catastrophic effects of an electromagnetic pulse-caused blackout could be preventable, but experts warn the civilian world is still not ready.

In the first few minutes of an EMP, nearly half a million people would die. That’s the worst-case scenario that author William R. Forstchen estimated in 2011 would be the result of an EMP on the electric grid — whether by an act of God, or a nuclear missile detonating in Earth’s upper atmosphere.

An electromagnetic pulse is a burst of electromagnetic energy strong enough to disable, and even destroy, nearby electronic devices.

The scenario sounds like something in a Hollywood film, but the U.S. military has been preparing its electronic systems for such an event since the Cold War. The protective measures taken to harden facilities against a nuclear attack also help in some cases to protect against EMPs.

The civilian world is another story.
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.

John Lubbock