The United Kingdom Atomic Energy Authority is a UK government research organisation responsible for the development of nuclear fusion power. It is an executive non-departmental public body of the Department for Business, Energy and Industrial Strategy (BEIS). The authority now focuses on United Kingdom and European fusion power research programmes at Culham in Oxfordshire, including the world's most powerful fusion device, the Joint European Torus. The research aims to develop fusion power as a commercially viable, environmentally sound energy source for the future.