Fusion power is mentioned a lot in Star Wars. In the Bad Batch arc of the second to last season of Clone Wars, the Separatist facility was powered by a fusion reactor. The A-wing is powered by fusion. GNK droids are walking fusion batteries and they have made fusion furnaces the size of a small generator. It is so commonplace that nobody gives it a second thought. Some ways to achieve fusion are through plasma, magnetic confinement, inertial confinement, Z-pinch, Beam, Muon-catalyzed. Which one does the Star Wars galaxy use?