Sorry, did misunderstand. On your blackout point: if a negatively charged solar flare we would have no defense, our magnetic field does not work on the negatively charged protons. If something like that hit the only defense would be to turn off all power on earth for the duration of the flare, which would keep the grid from overdoing itself. That would save millions in $$$, but would be a major inconvenience. Also, we cant predict what type of flare it will be till it hits a satellite in between earth and sol just for that purpose.