The longer your trade network, the more money each trade port will produce.īoth of these structures are quite expensive and you should be reserved about buying them until later on because of this. Instead, the goal is to produce a long trade chain. Trade ports are usually a better investment because they are less expensive than refineries and you don't need to place them where there are a lot of resource rocks nearby for them boost. Refineries only stack up to three times, meaning if you build two refineries at each of planets A and C, then planet B would only receive the benefit of three.

A and C each get the effect of one refinery, while planet B gets the effect of two (even though you didn't build any refineries there, it's adjacent to both A and B ). So if you have three planets connected like so:Īnd you build a refinery at planet A and planet C, then this is how it works. Refineries benefit each resource rock in the gravity well it's build as well as each resource rock in adjacent gravity wells.

Sins of a solar empire refinery