Doesn't make sense to me. Giant transformers are already in big steel boxes, which are Faraday cages themselves. The problem is that the transformers are connected to miles and miles of wires, which the EMP fields turn into huge sources of voltage and current. Each transformer needs giant fuses to protect if from the electricity produced on the transmission lines.
Fuses? That’s so 1950s. Today they use circuit breakers. Here’s a cool link:
https://www.youtube.com/watch?v=PXiOQCRiSp0
Faraday cages are not the total solution, but Dr. Pry (who has studied the problem for a long time) did indicated they are a major part.
I’m sure there are some massive surge protectors etc.
Come to think of it, he did not specify where the Faraday cages were needed. Maybe they are for other parts of the infrastructure. At some point I’ll find time to actually read the committees’s report.
And the fuses have to have crazy short trip times.