From the theeconomiccollapseblog.com:
Sometimes we all get a little reminder of just how completely and totally dependent we are on the power grid. Massive thunderstorms that ripped through Ohio, West Virginia, Maryland, Washington D.C. and Virginia left millions without power over the weekend. At this point it is being projected that some people may not get power back until the end of the week. The "super derecho" storm that pounded the Washington D.C. area on Friday night with hurricane-force winds is being called unprecedented.