The origin and nature of Blue Fusion Reactors is never fully revealed, but they are rumored to be reverse-engineered from alien technology (much like the Grays and B13 Antimatter Reactors). In official documents, they are referred to as an "artifact", and given the codename ROS172-E (ROS may stand for Roswell.), however this is likely false information meant to discredit anyone who sees and tries to go public with it. They are likely very expensive to build and maintain, as they are only seen in Sector 4 of Area 51.