Don't forget nuclear. Unstable grid makes them trip. Those turbines suck up a lot of energy. If the generator hall is offline for very long, the plant can't deal with the heat, so they have to bring the reactors offline. And if a reactor is stopped on short notice, you generally can't restart it for a few days minimum, until the xenon (etc) has decayed.

In other words, several days of outage were pretty much baked into the cake when the failure cascade reached a certain size.