Those systems are redundant . What this likely means is simply that you ' ll have to destroydisable both components simultaneously in order for the ship to see a loss in power . A ship with 2 powerplants which were NOT redundant would lose half of its available power when one of them was disabled . The Vanguard will only have the available power of a single power plant , but that power will continue to be available even when one of the powerplants takes damage . It ' s like the difference between wiring in series versus parallel . Or at least , that ' s my best guess . TLDR To reply directly to your supposition , the thing that is double with regards to redundant components will likely be the durability of that system , because it will take twice the firepower to destroy two redundant components versus a single component .