Geothermal generator

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Geothermal generator

Geothermal generator

Produces electricity from geothermal steam geysers. Must be placed on a steam geyser.

Base Stats

Market Value
945 Silver [Note]


6 × 6
Cover Effectiveness
Blocks Wind
Terrain Affordance
3600 W


Required Research
Geothermal power
Skill Required
Construction 8
Work To Make
12,000 ticks (3.33 mins)
Resources to make
Steel 340 + Component 8
Deconstruct yield
Steel 170 + Component 4
Destroy yield
Steel 85 + Component 2

The geothermal generator is a power generator that can be built on top of a steam geyser to convert natural heat into electrical power, providing a constant 3,600W. Steam geysers are randomly generated per map, sometimes close to each other, others scattered towards the edges or center. Colonies are often seen built in their proximity from early days for future benefit.


Geothermal generators can be constructed once the Geothermal power research project has been completed. They require Steel 340 Steel, Component 8 Components, 12,000 ticks (3.33 mins) of work, and a Construction skill of 8.


Geothermal generators are power generators that can only be built atop a steam geyser, and once constructed produce a constant supply of 3,600W. This power supply is infinite, invariable, and unaffected by weather. Like all power systems however, is still susceptible to solar flares and similar effects.

The construction of a geothermal generator does not inhibit the heat created by the steam geyser, and the geyser will still heat rooms if enclosed. In fact, a room with a Geothermal Generator will be hotter than a room with just a Steam Geyser because the Geothermal Generator shrinks the room size and less cells are needed to be heated. If enclosed in a roofed 6 × 6 room, the heat generated can be sufficient to autoignite the generator in some biomes.


Reasonably defended generator. Most raiders won't try to target this. Leave it unroofed.

Geothermal generators are excellent as a sustainable power source, providing a relatively large amount of permanent, free energy. This comes at the cost of being locked into set positions on map generation. It is often worth choosing a base location that is reasonably close to a steam geyser. Having access to a single geyser can significantly offset a colony's power needs, while having several can potentially fully supply a modest late-game base. If geysers are available in reasonable locations, Geothermal power should be researched relatively early, to provide eternal power for your growing base.

As they usually make up a significant portion of a colony's power generation, are relatively expensive to construct, and geysers can spawn in vulnerable locations, you should protect your generators. A single layer of nonflammable, stone walls is usually enough. Raiders which are not breachers or sappers will never target anything behind a layer of walls, so long as they have another valid target (colonist, roaming animal, furniture) without breaking a wall or door. Breachers and sappers will only target walls if they'd be in the way. Multiple layers of walls can be used for extra protection, if so desired.

A small, 7x7 interior is enough to extinguish fires that happen to start on the generator. Leave the generator room's unroofed to prevent overheating. As the generator's components can break down, leave a door so you can access it. And, because power conduits under a wall are similarly protected from raiders, you may want to have the power line covered by walls.

In cold biomes, the heat from the geyser itself can be beneficial. The amount of heat it provides is only a little more than a normal heater.[Fact Check] It cannot be controlled normally, though you can open/close doors, vents, or tear down roof or walls. Depending on the outside temperature, if closed under roof a geothermal generator can heat up to 8 rooms of 6x6 placed symmetrically around it with a 1 tile corridor in between.

A geothermal generator and 2 batteries can power a sun lamp and full set of hydroponics basins.

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