[eppp]

An EMP attack would destroy the power grid, your modern electronics may survive but without anything to power them.

[iso1210]

If it's just the grid that's gone, generators are available - hell I have a mobile one sat in my driveway.

[tgsovlerkhgsel]

That doesn't help you if you can't get the fuel for it. Most industrial facilities can't just run on generators. Data centers can in theory, but I somehow doubt those diesel delivery contracts would be fulfilled, and good luck calling around asking for alternatives when the phone networks go down.