German steel maker Salzgitter, which is introducing innovative technologies with Salzgitter Low CO2 Steelmaking to use hydrogen, has continued its successful cooperation with Sunfire to integrate novel GrInHy2.0 electrolysis technologies for hydrogen production in an industrial environment. Since 2019, the project partners have been operating a high-temperature electrolyzer from Sunfire with an electrical connected load of 720 kW on the premises of Salzgitter Flachstahl The green hydrogen produced is fed directly into the hydrogen grid of Salzgitter Flachstahl & to date almost 100 tonnes of the gas have been used in annealing processes and galvanizing plants for steel finishing. Already at the beginning of the year, the Sunfire electrolyzer set new efficiency standards: For the first time, the project partners were able to demonstrate an electrical efficiency of 84 %el,LHV, this corresponds to an energy requirement of only 39.7 kWh/kgH2. In addition, the system produced up to 200 cubic meters of green hydrogen per hour. The electrolyzer is based on the innovative SOEC technology (solid oxide electrolysis cell) and runs at operating temperatures of 850 degree Celsius. The system utilizes industrial waste heat and renewable electricity to split steam into its components hydrogen and oxygen In addition to Salzgitter Flachstahl, Salzgitter Mannesmann Forschung and Sunfire, the SMS Group company Paul Wurth, Tenova and the French research institution CEA are also part of the project.