The Rebel Confederation employs Energy Defense Fields to safeguard civilian populations from raids and bombardments. With this technology, lightly defended settlements prevent starships from stealing resources and directly attacking the surface.
To generate this shield, a colony builds at least 20 defense outposts and sets the EDF Friendly Code. Maintaining this protective shell consumes the planet's fuel reserves at a rate of 25 KT per turn. Furthermore, a single world cannot support both an EDF and a starbase.
Lastly, there are rumors of some scoundrel pilots using EDF distortions to hide the presense of Falcon Class Escorts. In such cases, the hyperjumper acts as if it is cloaked; it arrives at the planet and cannot be seen or attacked.