From the toxic contaminated site to the peak of renewable energies: The Georgswerder landfill hill became a regenerative energy mountain as part of the IBA Hamburg. With wind power and solar energy alone, it supplies around 4,000 households with electricity and is accessible to the public as a vantage point. The 40 meter high, green hill in Georgswerder, visible from afar, has an eventful history. After the war, rubble and household garbage were piled up on the flat meadows northeast of Wilhelmsburg; later toxic industrial waste such as paints and varnishes were added. In 1979 the landfill was officially closed, but in 1983 it turned out that highly toxic dioxin escaped at the foot of the artificial hill and got into the groundwater. The dump hill and the subsoil were then carefully secured - in close contact with the Georgswerder working group and residents in the immediate vicinity. The landfill landscape was then covered with a plastic sealing membrane and top floor and built on with the first wind turbines. To this day, the groundwater has been protected with extensive technical measures.