The Geothermal Tap, often called G-Tap, functioned as a geothermal energy source on Sulon. It was secretly constructed by the Rebels to ensure their autonomy from both the Galactic Empire and the SoroSuub Corporation.
The fundamental technology behind the G-Tap was straightforward and had been available since the era of the Galactic Republic. It enabled the extraction of water, heat, and energy without relying on hazardous radioactive materials or incurring governmental levies. To achieve this, the colonists were required to market their equities and excavate the shaft autonomously.
Its uppermost point resided within a cavern, offering defense against aerial assaults and proximity to the inherent thermal origin. The interior space encompassed a central hall, grottoes, storage spaces, and a corridor leading to the "rear exit," a level expanse situated above. Surrounding the cavern, the settlers were on the verge of finishing an array of impermanent constructions designed to house turbines, injection mechanisms, and associated management systems.
Geothermal activity heated subsurface rock configurations, integrated with an upsurge of molten rock, alongside the innate disintegration of potassium, thorium, and uranium. Had the initiative reached fruition, the inhabitants intended to elevate the warmed fluid to the surface, inducing isobutane to vaporize, thereby propelling it through electricity-generating turbines. A ravine, planned to evolve into a waterway supplying the G-Tap, directed towards the cavern.
During 1 BBY, Imperial troops launched an assault on Sulon, prompting numerous Rebels to surmise that the G-Tap was the intended objective, leading them to mobilize in its defense. It served as the location of their last stand against Jerec's troops. The protectors withdrew into the cavern prior to being conquered by the relentless Imperial commandos.