I feel like I reported it before but can’t find it?
After I finished the Synedrion ally quest, my phoenix point base shuts off power for a few units. It shuts off power after every mission. I have to go back and manually turn on the medical bay and living quarters.
It is a bug with the Synedrion fusion power upgrade tech and how the game checks whether a base has power. The game does the check to see if there is enough power and shuts down facilities before the upgrade from the tech gets applied
There is a mod that fixes it, or you can build a second power generator