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Coal Generator is a medium-sized (3x3 tiles), energy generator that uses Coal to produce 600W of energy. It does not require Duplicant work (apart from delivering Coal it consumes). The generator does produce a large amount of heat, so keeping this item along with a Battery for storage in a Frozen Biome is ideal for temperature control.  The Coal Generator is unlocked in the second tier of Research - Internal Combustion

Tips:

  • generated energy can be stored either in a Tiny Battery or Battery allowing devices to work for some time after the generator runs out of energy (and to temporary use more than 600W of energy at once),
  • since Coal Generator produce Carbon Dioxide it should be dealt with accordingly or a room will be filled with it.
  • Coal is non-renewable resource and it will become very scarce ~40 cycle if Coal Generators are used as a primary source of energy.