A siphon generator was a generator that sucked life out of planets, outputting large amounts of electricity. Because they were harmful to their environments, siphon generators were often used on isolated worlds in extreme situations. During the Clone Wars, the Techno Union constructed a base on Nelvaan powered by a siphon generator, which fed off a geothermal crystal. While the generator was active, the planet's thermal energy was lessened, keeping it in a wintry state. The generator was destroyed by Anakin Skywalker.