If you need it, sure. But as Benjammin pointed out, from a weapons grade or massive solar flare EMP, don't count on anything you are likely to make being worth much.

And honestly, I doubt we'll ever have to find out which of the many schools of thought on EMP are the right one. You find everything from "no big deal, the gaps in modern components are too small" to "if it's got a transistor, it's smoked", and that gaumet is put out by a variety of people in the know. The truth probably lies in the middle, but there isn't enough declassified research for me to make a guess.

Just remember, if there is a big pulse, OK, you've got a XYZ, so long as you have power for it. Power lines are going to turn into big antennas, they'll have heavy spikes- the power grid is going to be at best a nightmare.