Editorial use only Wendelstein 7-X stellarator. The Wendelstein 7-X fusion device at Max Planck Institute for Plasma Physics (IPP) in Greifswald, Germany, produced its first hydrogen plasma on 3rd February 2016. This marks the start of scientific operations. When it was built the Wendelstein 7-X was the world largest stellarator type fusion device. Its objective is to investigate this configuration suitability for use in a power plant. Federal Chancellor Angela Merkel is at centre.