If you click on hammer icon in the top right of the screen, you can see that the Power Station is associated with Strength. We’ll again use the Power Station to make our point. If you get a zero, it means that adding that person to that room is completely useless and you’d be best to find somewhere else that they fit in better. This indicates their productivity in that particular area. When you touch and drag a Dweller to a particular room, you’ll get a number popping up on your screen before you drop them. It is by far the most important of all the rooms you’ll add. It’s best to make sure that you always have enough Dwellers to staff your Power Station. You see, adding more rooms requires more power, and if you don’t have Dwellers assigned to that room, some of your other facilities will go dark.

We learned this the hard way, biting off more than we could chew with the limited amount of Dwellers at our disposal.

You don’t have a choice in the matter, but it’s easy to get room happy as soon as the game hands over full control.

The first thing that Fallout Shelter will do is teach you how to add a couple of essential rooms, Such as the Power Station and water Treatment.

Fallout shelter loading screen tips