It is really no trick to harden our infrastructure. But it demands engineering and steady replacement of old equipment with hardened hardware. Just like we cycled out of PCBs.
And that all starts with code and it applies to our computers as well.
In the worst cases you use Faraday cages which is the optimal solution. All transformers are built inside Faraday cages as in a steel shell. You get my point.
How Trump can face the EMP threat head-on
SCIENCE | MAY 31, 2017 | BY NEWT GINGRICH