Gas Refineries, sometimes called gas foundries or gas mines, were factories created to refine and purify different types of gasses into usable products for blasters, star ships, and power generators. One of the most well known gas refineries was Cloud City on Bespin which converted the planets natural tibanna gas into usable fuel for blasters. During the High Republic era the Nihil took over an abandoned gas foundry on the planet Xais and used it to fuel their fleet.