The example of an EMP is the most obvious one due to the assortment of novels based on that idea. However, I have concluded that regardless of the type of disaster our power grid is aging and becoming steadily more fragile. The government is seriously considering shutting off coal, which would take 15% of the generating capacity offline. Toss in another Hurricane Sandy circa 2016 and we could be faced with a northeast blackout lasting longer than anything we have seen to date, particularly if it takes out a couple of the local nuclear plants. An earthquake in a highly populated area, e.g. Manhattan could be another mess. After 9/11 the idea of a dirty bomb in Manhattan seems easy enough to imagine.
Fukushima took out a wide area without being a countrywide or worldwide apocalypse and the idea of a similarly scaled disaster somewhere in the US is easy enough to imagine. Then of course there is the flu, . . .
I hate to be depressing with this stuff, but from my experience when things go really wrong is when multiple things go wrong at the same time. I read a novel recently based on the idea of two Hurricanes hitting a few weeks apart. The two Hurricanes were sort of like Katrina and Sandy happening in the same season and they manage to severely damage refineries on both the Gulf Coast and the East Coast. Then a war in the middle east hits supply coming from there. The loss of so much energy infrastructure all at once results in a Depression like economic collapse.
Maybe after being in the WTC on 9/11 my imagination has become overactive but I think the power grid is not being maintained or protected and it is vulnerable and I don't think I am adequately prepared.
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