If One Storm Can Turn D.C. Dark For Several Days, What Would A Massive EMP Burst Do?

The “super derecho” storm that pounded the Washington D.C. area on Friday night with hurricane-force winds is being called unprecedented.  But the truth is that there are other events that could happen that would be far more damaging to our power grid.  For example, a substantial EMP burst over a major U.S. city would fry virtually all of the electronics in the city and take the power grid in the area down indefinitely.  A gigantic EMP burst over the entire country (caused by a massive solar storm or a very large nuclear explosion high in the atmosphere) could theoretically take down the entire national power grid.
http://preppercentral.com/?p=2185#more-2185

EMP Model

Current thinking is that  the target will probably not be an individual city, but a central location over the continental USA, with the nuclear detonation occurring a couple hundred miles in altitude, at the edge of space. Under this scenario, the EMP would affect the entire US power grid. (Strike the Root - Moore)

A 30 gallon galvanized trash can (Home Depot, Menards, Lowes) cum Faraday cage. Seen with heavy-duty single strand grounding wire. The ground wire connects with only with the ground terminal of a three prong electric plug and is plugged into the household power grid to provide grounding. (4D Traveler)

http://madtownpreppers.blogspot.com/2012/04/emp-101-faraday-cages-cheap-easy.html

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