That’s when you end up with a cascading failure (https://en.wikipedia.org/wiki/Cascading_failure https://en.wikipedia.org/wiki/Cascading_failure). The remaining

That’s when you end up with a cascading failure (https://en.wikipedia.org/wiki/Cascading_failure https://en.wikipedia.org/wiki/Cascading_failure). The remaining generators are overloaded by the demand and shut down to protect themselves as well, which further decreases the supply and causes more stations to shut off, etc. The Wikipedia article about the northeast US blackout of 2003 is a very interesting read: https://en.wikipedia.org/wiki/Northeast_blackout_of_2003 https://en.wikipedia.org/wiki/Northeast_blackout_of_2003