Magnox Ltd is a nuclear decommissioning Site Licence Company (SLC) under the Nuclear Decommissioning Authority (NDA), a government body set up specifically to deal with the nuclear legacy under the Energy Act 2004. In September 2019, it became a direct subsidiary of the NDA. The only Magnox power station in the United Kingdom not managed by Magnox Ltd is Calder Hall, which is part of the Sellafield site and is controlled by Sellafield Ltd.