This article is for the PC version of Stellaris only.
Terraforming is the act of changing the planet classification of a celestial body in order to make it more habitable for the empire's species. The base technologies requires significant society research to unlock and each terraforming project requires significant investments of Energy and time.
Terraforming is started via a button in Planet Detail view. The world must be surveyed and within your borders. Only habitable worlds and Barren Worlds that have the rare "Terraforming Candidate" modifier can be terraformed. The expansion planner screen can be used to find these rare candidates.
Ecumenopolis worlds are created via decisions rather than teraforming. They must be inhabited but pops do not suffer a happiness penalty during the process.
The following planet modifiers are always removed when terraforming a planet:
When and if terraforming a planet to Hive or Machine World, keep in mind that all planetary features, excluding a few rare ones that give access to rare resources, will always be removed.
Cost reduction & Speed
- The edict Terraforming Gases increases terraforming speed by +50% at the base cost of 25 Exotic Gases
- The World Shaper Ascension Perk decreases terraforming cost by -25%.
- The ruler trait World Shaper increases terraforming speed by 25%.
- The empire modifier Secrets of the Baol decreases terraforming cost by -15%.