12/09/2025
ON THIS DAY - 27th August 1956. Calder Hall in Cumbria became the world’s first commercial nuclear power station to supply electricity to the public grid. Built on the Windscale site for Britain’s post-war weapons programme, it was codenamed PIPPA (Pressurised Pile Producing Power and Plutonium) and served both civilian and military purposes. Its four Magnox reactors set the design for Britain’s first nuclear stations, running until 2003. The site also housed the prototype Advanced Gas-cooled Reactor (AGR) and the Windscale Piles, which produced plutonium for the UK’s bomb programme until a 1957 fire shut them down. These facilities mark milestones in both civil nuclear energy and the Cold War. Archive image: Energy.Gov (HD.15.012) Public Domain.