High temps + Air Conditioning + Maxed out Power Grid = Blackout
Also, I suspect the "computer problem" they are blaming it on, probably just means that the computer didn't find any more power to switch around the grid for all the AC and had to start shutting it down. Considering the weather conditions hitting that area right now, it's highly likely that their grid was at maximum capacity, so a computer error sounds like a really fishy excuse...










