Calder Hall

Calder Hall stands on the Sellafield site in Cumbria. It was the world’s first full-scale nuclear power station, built in the 1950s to produce weapons-grade plutonium. The plant was designed by Christopher Hinton and built in two phases, A and B, each with its own turbine hall and two cooling towers. Four Magnox reactors used natural uranium fuel and carbon dioxide cooling. The station also supplied electricity to the National Grid as a secondary role. Calder Hall’s significance lies in its dual purpose during the Cold War era. It supplied plutonium for Britain’s nuclear weapons programme, including the WE.177 series. Queen Elizabeth II opened the station in 1956, marking a new chapter in energy and defence history. The plant operated for nearly 47 years before closing in 2003. Its decommissioning began in 2005, with cooling towers demolished in 2007. Visitors to the site now see a landscape shaped by industrial history. The reactor cores and radiation shielding remain under long-term care. The former turbine halls and foundations are still visible, though much of the plant has been removed. The River Calder bridges and extended site show how the station expanded across the land. The remaining structures stand as silent witnesses to a pioneering era of nuclear power.