That would be the main problem. How much of the power grid would be destroyed. You have the event, and then as those areas stop, you have the effects of the surrounding grid try to compensate for that and some of this could be damage a great extent. How much will be effected, we may never find out.
Yes, with out the power grid, and if you don't have access to generator, your appliance at home will not work anyways. Then you have the entire problem of moving things from point A to point B. Or if the EMP area had such facilities as refineries or petro-chemical plants and how many they affect. Well, if you don't get gas for the generator it is worthless after you run out, or the fact you may have to chose traveling or having power.
90% seems high, but it can be possible. We have grown into society that depends too much on services that we take way to much for granted. With an EMP event say in or around Houston, LA-Long Beach, NYC-Boston, Chicago, or some major city along the Mississippi could have that affect. All for very different reasons too.
Just some thoughts
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