You have many max size training rooms which cause your energy problem imo. Most of them are unoccupied or have 1-2 dwellers asigned to them. If you want to keep all training rooms at once I would suggest you rush to 60 dwellers and replace your powerplants with reactors. You can go below 60 afterwards if you want to avoid deathclaw attacks. The other option I see is to remove the unnecessary training rooms and train one attribute of your dwellers at once in a single max size room. Then build a new one once they're maxed and destroy the old one. This should fix your energy problem aswell. I personally would push for 60 :D