There's an oblique mention of it near the end:

"When the bomb burst, people told of blackouts and strange electrical malfunctions, like garage doors opening and closing on their own."

The Soviet tests are interesting. They actually managed to burn down an entire electrical power station with the EMP from one of their bombs.

Edit: looking into it more, the destruction of the power station is uncertain. There was definitely a fire at the Karaganda power station, but there's only one vague reference to it being destroyed as a result. Interesting how a question like "did this entire power station burn down in the 1960s?" can remain unanswered today.