He was on the morning CBS News talking about his new book. Ted Koppel is not a conspiracy theory type of person and definitely not one to hype a topic that he knows nothing about. The reviews of the book at Amazon.com look uniformly good and I intend to get the Kindle version for my reading library.
One of the things I'm going to look for is if he addresses an Electromagnetic Pulse (EMP) event in addition to his concerns about a cyberattack. Both will have the same type of consequences -- no power, with even more impact I think from an EMP due to the physical damage that can occur.
As he noted in the television interview, "What is the downside of becoming organizationally and personally prepared?" Little in my opinion. There are plenty of other disasters that will "turn out the lights" and have other infrastructure impacts. But, it is the lack of power in our interconnected world that is highly interdependent on electrical power that will take us back to the Stone Age.