Recently, a huge solar emission struck a glancing blow to the geomagnetic field. No significant damage resulted.
However, the NOAA expects four "extreme" solar emissions will strike
our magnetic field during this decade. Solar emissions are expected to peak in
2013.
In the event of a direct hit on the geomagnetic field, NASA estimates grid
collapse in most of the Eastern part of the nation, as well as the Northwest,
lasting for weeks.
It is little realized that nuclear plants have only two days of emergency
power. If the grid fails, after that, each nuclear power plant becomes a source
of a serious radioactive release.
See http://www.aesopinstitute.org for a couple of maps that highlight the danger.
Attacking the problem opens the way to accelerate decentralization of energy.
Cheap green systems are en-route to market. See for example the E-Cat on the
same website. It promises power for a penny per kilowatt hour. The fuel for
small multi-kilowatt modules is $100 worth of Nickel and Hydrogen every six
months.
Mobilization to minimize the damage can attract support all across the
political spectrum.