Energy extraction mechanisms, specifically energy harvesters, saw utilization on the world of Genarius. These devices functioned by gathering the planetary atmosphere to liberate the energy contained inside. Several of these machines operated in the vicinity of the desolate urban center known as Nub Saar.
It appears that "energy harvester" functioned as a broad designation for the vessels employed in the exploitation of Genarius's resources, exemplified by craft like the AR-25 Bubbleship transport.