https://www.amazon.com/Lights-Out-Cyberattack-Unprepared-Surviving/dp/055341996X
My source, sorry I'm not going to reread the entire book right now to pull his sources. Feel free to order and read it's a worthwhile endeavor. Throughout the book some speak on the basis of anonymity, and of those cited included are several heads and members of preparedness and defense agencies.
From my understanding we have three grids (eastern, western, and Texas) making up our national grid. What I did not know before the book as Koppel explains the system has to keep a certain level to operate. If power drops during peak times due to usage more power has to be loaded onto the grid from somewhere to compensate so they buy from other companies. In this case for example (I'm not sure of exact boundaries or the states he uses in his example) but Indiana can buy power from Florida. While they are not using exact power from Florida they are taking from the shared grid which Florida is then adding to.
I'm really not trying to become a cheerleader for this book but it was an interesting read which opened my eyes to some things regarding our grid. It's written by a well respected American journalist with over 25 years experience who used his connections and reputation to gain access to these federal officials to interview on the subject. It came out I believe in 2015 so the information should be mostly up-to-date unless there have been radical changes to how energy companies, the federal government, and the industry standards operate.
I agree right now it is the stuff of fantasy as it hasn't occurred and we would like to think we're protected and insulated against it well enough so that it's one less concern to have. In my lifetime I've seen many things come to pass which previously would have only been the stuff of movies. I would have thought my personal information was protected by my government and that the Chinese would never have been able to access it, however, as we learned OPM was breached and they stole it along with the data of many others. It's an age of cyberwarfare now.
Potential natural events are always best to be viewed as legit. There's no puppeteer behind those strings.
Any extended time without power would cause an incredible amount of devastation. Not outright or direct, but in how we mitigate it and survive--given that we're not good at that anymore without modern "basics" and infrastructure.
Two books; read them:
-Lights Out: A Cyberattack, A Nation Unprepared, Surviving the Aftermath
Ted Koppel wrote a book about this.
He recently wrote a book "Lights Out".
http://www.amazon.com/Lights-Out-Cyberattack-Unprepared-Surviving/dp/055341996X This generation is the most self centered generation yet. Just wait until you see the next one. Yeah you got me. Good one.