Cheap orbital flak batteries. The first line of any planetary defence.
Cost at level 1
5 400 Alloy · 1 800 Crystal
Cost growth per level
×1.50
Energy drawn
2 per level
Crew needed
2 per level
Defence
60 per level
Building fields
One per level, like every structure.
Emplacements fight in the line as units of their own – a battery of level N fights as N guns. They are knocked out during a battle, never demolished: ground crews have them firing again before the next fleet arrives, so their levels never drop and you never pay to rebuild them.
Figures are read from the game's own configuration and are the ones the server uses.