I know because we had a power outage of adequate length that we had to move all the chickens - the ones in the incubator and the ones in the brooder (the kids named it "The Nest") - to another teacher's house.
They come back to school tomorrow. 13 have hatched and 2 more have pipped; one of the ones that pipped is not a healthy chicken and won't make it, I don't think. This is sad and hard to explain to the kids. One of the ones that hatched today has shell stuck on its head and was attached to its umbilical cord for awhile. It isn't drying very well. Of course, it is my favorite chicken and the only one that I have secretly named in my head. But otherwise they seem okay, especially given the whole "driving in a car after drastically falling temperatures". We'll see.
In conclusion, PG&E tried to kill my class' chicks, the foul fiends.