For a while, electricity producers were paying customers to keep making cars or whatever. Most of us were fast asleep with the windows open. It's not totally insane to have this situation just before a busy morning, since it is impossible to stop and start a nuclear power station. And maybe it's windy with a zillion bird whackers pumping in the juice. If the power isn't used, the grid goes wacky, and maybe blows, so it's best if somebody makes some extra steel that day.