Steorn Ltd /ˈstjɔrn/ is a small, private technology development company in Dublin, Ireland. It announced in August 2006 it had developed a technology which provides "free, clean, and constant energy" in violation of the law of

Steorn Ltd () was a small, private technology development company based in Dublin, Ireland. In August 2006, it announced that it had developed a technology to provide "free, clean, and constant energy" via an apparent perpetual motion machine, something which is contrary to the law of conservation of energy, a fundamental principle of physics.