In a "good" scenario, you could be without power for months. In a "bad" scenario it could be years before power was restored. This is one that they should be addressing now, but I think the power companies have no desire to harden their systems to protect them. They'd rather roll the dice and take the chances. Sadly, even a middling scenario could result in thousands of people dead from lack of power. And the government, (in the form or FEMA) won't even say what their plans (if they even have one) are. Not sure you can prep for a years long power outage. It's an instant return to the 18-19th centuries. The amish would be OK, but the rest of us are screwed.
DHS: 100 Million Americans Could Lose Power in Major Sun Storm | Washington Free Beacon
DHS: 100 Million Americans Could Lose Power in Major Sun Storm | Washington Free Beacon