There are no plans to prevent an EMP attack specifically, because it would be treated the same as any nuclear warhead fired at the USA.
This is a joke:
Power companies have made a few moves to protect against electromagnetic interference. Some grid operators and transmission infrastructure owners are putting in place so-called Faraday enclosures, shields of conductive material used to protect electronic equipment and facilities. Utilities have also started stockpiling spare parts to replace any that are damaged by an EMP event, storms or other disasters.
These must be token gestures only. If an EMP strikes the USA, the whole country is screwed. Power companies will cease to exist. Nobody will be fired or judged for not having prepared. An protecting the entire grid is impossible, unless the government steps in and spends a huge amount of money.