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The nuclear reactor is a room available in Fallout Shelter.


The nuclear reactor is the Tier II version of power generation. It produces a moderately larger amount of power, although it is significantly more expensive. Like most other rooms, the Nuclear Reactor can be combined into a 3 wide room, increasing production and allowing more workers.

Power generation[]

To increase the speed at which power is generated, place dwellers with better Strength in this room.

The nuclear reactor room, like other rooms, gains a production and upgrade cost bonus from being connected to another room of the same type and level. The rooms will gain more than x2 production bonus for each connected room. Upgrade costs will be 25% cheaper for a double room and about 33% cheaper when upgrading a triple room vs upgrading 3 single rooms.

Compared to the power generator, the basic power production room, the nuclear reactor generates more power with a slightly longer production time. The nuclear reactor is overall the more efficient of the two, with a better ratio of production time to production quantity than the power generator. The nuclear reactor is also significantly more expensive to build and upgrade than the power generator room, but also has the benefit of vastly increased power storage capacity, four times as much.


Single Room Double Room Triple Room
Nuclear Reactor Output 13 27 57
Nuclear Reactor Storage 200 400 600
Advanced Reactor Upgrade Cost 3000 4500 6000
Advanced Reactor Output 15 32 68
Advanced Reactor Storage 300 600 900
Super Reactor Upgrade Cost 9000 13,500 18,000
Super Reactor Output 19 40 85
Super Reactor Storage 400 800 1200