LOL, the feds commissioned a report on just this problem and the report reveals that a detonation has a very wide ranging reach and presents a very serious problem for a very unprepared United States.
The range problem is easily overcome when the amplifying affects of the existing above ground power grid is taken into account allowing the pulse and subsequent damage to be spread far beyond line of sight.
And thus your statement begs; what would amplify an EMP surge that got introduced to "the grid" (via any means) all the way from one coast to the other?
According to the Federal report, an EMP blast would most definitely have a very defastating affect on power companies. By many estimates, it would be months to restore any form of power to affected areas. They are simply not capable of withstanding the pulse from a nuke generated EMP attack. Further, such an attack would destroy food distribution capability while ensuring that the affected areas would suffer from mass rioting and starvation. Hardly a "boost for the economy".
Wouldn't be the first time you've wholeheartedly trusted the government, right?
How would an EMP attack destroy food distribution? The computers in vehicles/tractors? Hey guys, did we know about THE ENTIRE distribution and warehouse industry being reequipped and completely modernized in the last 20-30 years? Sh!@, I better get out to the Strawberry fields and packing houses I was driving through this Saturday and assure that those thousands of laborers are going to be rendered useless and incapable...
Mass rioting? Well sure, idiots are everywhere and don't need to be given much of an opportunity to be one. Anyone who's lived through a natural disaster where power was cut for days will tell you looting and rioting began the minute after the lights went off and that none of the looters waited until they got hungry.
Starvation? 7-days without any food and no US region will turn into warlord-run Somalia 2.0, it'll take at least months for things to degrade down to that level.
You know, I wonder who was cooperating with that big goverment-spending-inducing report and investigation... wouldn't/couldn't of been a bunch of large and powerful utility or food company/distributor/union's lobbyists and companies?...
As has been said, electric companies have been dealing with EMPs for a long time and in many different forms. Still don't believe me?
I hope lightning strikes and opens up your mind.
*hint* *hint* *nudge* *nudge*
Now tell your nutty friend to pay attention to the professor during science class.