So they say
I don't know if it's true or not, but some of the people involved in the show claim they've approached a physicist(?) about the reason for the blackout, and they said it was plausible.
Still, when I hear "the laws of physics changed," I cannot help but be reminded of "Perhaps the laws of physics cease to exist on your stove. Were these magic grits? Did you buy them from the same guy who sold Jack his beanstalk beans?" Probably not the connotation the series is aiming for ...