The premise of the book was disturbing considering that EMP is possibly the likeliest threat to us from any small country possessing a limited nuclear capability (i.e., Iran, North Korea). If you are intrigued by that kind of premise, here are a couple of more recent publications on that order:
77 Days in September, by Ray Gorham
Winterkill, by Gene Skilleg
Perhaps I'm too critical, but I give all three of these a "C," primarily because the character development is not very . . . mature. However, plot and premise are interesting in all.
As a fan of post-apocolyptic fiction, I'm currently re-reading an old favorite: Farnham's Freehold, by Heinlein. Nostalgia reading for one raised in the shadow of the Soviet nuclear threat.