The sun generates energy by melting atomic nuclei. In Greifswald, scientists are researching how technology can emulate this process. Wendelstein 7-X is the name of the fusion plant for hydrogen plasma there, the most advanced of its kind worldwide. The core of the research facility is a heat-insulating magnetic field in which the hot plasma is enclosed. As a result, the plasma does not come into contact with the cold walls. Scientists, engineers, and technicians from all over Europe are working together on the plant. Their objective: to generate clean energy from nearly unlimited stocks with no harmful emissions or long-lived radioactive waste.