Purchasing the same type of upgrade on the same planet grows progressively more expensive.
With the exception of designating your capital, all planet upgrades have the same costs. Different types of planets have different maximum levels for each type of upgrade.
Civilian InfrastructureEditpopulation of a planet, the greater the tax income it contributes to an empire. Terran Planets usually support the largest infrastructure and Asteroids the least (Dead Asteroids only stop siphoning money away with the upgrade), but it's still advisable to max this out quickly, as it will lead to increased credit production and prevent you from losing income to under-development.
|Upgrade Level||Terran||Desert||Volcanic||Ice||Asteroid||Dead Asteroid|
(*) Indicates planet underdevelopment is suffered at this level.
|Upgrade Level||Terran/Desert/Ice/Volcanic||Asteroid/Dead Asteroid||Pirate Base|
Explore PlanetEditPlanet Bonuses or Artifacts a planet may possess. This upgrade is important because the special bonuses can make the planet more efficient and artifacts provide empire-wide bonuses. You can search any planet up to two times, but no planet can ever have more than two planet bonuses and one artifact. Artifacts or planet bonuses can never be found on player homeworlds. If you conquer an enemy homeworld, be sure not to purchase this upgrade!
Designate Capital PlanetEdit
Logistics CapacityEditOrbital Structures such as Shipyards, Refineries, and Trade Ports. This upgrade can be useful if an empires wants to build additional research or productive structures. Upgrading Logistical Capacity will also produce more constructor vessels, which enables faster assembly when you are building a number of structures.
All Logistics Structures other than Extractors cost 4 slots (extractors cost 0).
In most cases, it's actually cheaper to colonize a new planet for its "free" logistics space rather than paying for additional space at an existing planet. That's if there is still unclaimed real estate around.
|Upgrade Level||Terran||Desert||Ice/Volcanic||Asteroid||Dead Asteroid/Pirate Base|
Tactical CapacityEditOrbital Structures such as Point Defense turrets, Hangar Bays, and Repair Platforms. This upgrade can be useful if an empire wants to permanently augment a colony's defense. Upgrading Tactical Capacity will also produce more constructor vessels, and in larger quantities than Logistics upgrades, which enables faster assembly when you are building a number of structures. Which might matter a lot if you're hastily replacing destroyed defenses.
The first two levels of this upgrade add one extra construction frigate to the planet. Different tactical structures require different numbers of tactical slots.
|Upgrade Level||Homeworld||Terran/Desert/Ice||Volcanic||Asteroid/Dead Asteroid/Pirate Base|