Because NASA isn't in charge of the energy sector? They monitor and advise. DOE via FERC is in charge of the electrical sector. The ES-ISAC, run by the FERC-appointed ERO, NERC, and the regional Reliability Coordinators (PeakRC in the western US, formerly the WECC RC).
More to the point, there are NERC standards being developed which deal with geomagnetic disturbances. A TPL and EOP standard: http://www.nerc.com/pa/Stand/P...
The bigger issue is cost. We can prepare for anything, but at what cost? Are you ready for your electricity rates to double to cover a 12% chance in the next 10 years? It's a tough balanacing act.
Why would rates double as a result of putting into place a plan (and probably a few layers of communications systems on top of already existing infrastructure) to mitigate the problem before it starts? Oh right, because we would have to pay for a team at NASA, a team at FERC, a team at each of the regional ISO, etc. to all do the same thing? Ugh. Put NASA in charge, they got us to the moon damnit. If rocket scientists cant fix it, no one can.