100% Certainty of Total Catastrophic Failure of Entire Power Infrastructure Within 3 Years1) Ill-informed balderdash; there are 3 independent, NON-interconnected 'grids' in North America to start with.
2) Over-looks man-in-loop operation (it's what keeps the system running day-to-day hour-by-hour!); islanding, selection of alternate transmission paths during thunderstorms and damage to transmission systems ... there are multiple redundancies if, and only if each system operator is capable of seeing operation in his area (unlike Ohio's First Energy where bad things that they didn't see started about an hour before on a 'non-standard' temperature day.)
considering the record of mischief I see it to be reasonable that at some point a hacker could and most likely will cause a major outage. How bad it will be????