I saw an interesting article a day or so ago on Yahoo, and forgot to post it here, with a link, so here it is:
link
Apparently, authorities are a bit worried about a major solar flare from the sun hitting the Earth, and wiping out 1/3rd of our electric grid, causing 100+ million, or so to be without power for years.
If it is anything like the events of 1859, and 1921, apparently, we'd be in serious trouble.
It appears that some authorities are attempting to play down the severity of the issue, since the recommended preparation should a big flare head our way is to unplug electronic equipment from your power outlets.
As mentioned in the article, it fails to provide any concrete suggestions on how to survive for years without electricity, working ATM machines, fresh water and sanitation, or regular food deliveries.
So, for you post-apocalyptic gamers, looks like you have another scenario to kick off your games.