I see two things which can/should be done...
1) Immediately begin EMP and cyber proofing the power system (very low chance of this happening).
2) Prep for such an event at an individual and group level. (100% chance of this happening...)
A more remote option is to apply pressure to your local and federal representatives to take action on this.
Unfortunately, the incentive, on the part of politicians, to address this is small.
It would be a good way to stimulate the economy if money (tax dollars) were thrown at implementing a solution, but we are still looking at years of "research" (can you say boondoggle?) before actual work might begin.
Perhaps a private enterprise might be convinced to work on this, similar to the changes in the space program, but we're still talking years.
So, Prep for it:
If you plan on having electrical power, for anything, then invest in EMP proof generation systems (solar, wind, hydro, hydrocarbon, etc.). Not just buying such systems for your homestead/BOL, but engineering them for EMP resistance.
Needless to say, your home power systems need to be isolated from the Internet or they become vulnerable to cyber attack just like the public systems.
Fallback plans need to include living without electrical power for extended periods. Caches of generating equipment which are only intended for use AFTER the public system might go down. EMP proof caching of course.
What are YOUR (all who read this) plans with respect to this scenario?