The technology of high-temperature electrolysis enables the reversible operation of the trial facilities. While, during electrolysis operation with the highest electrical efficiency levels, the technology turns industrially generated steam from waste heat into hydrogen, in the reverse case of fuel cell operation, it produces electricity and heat from hydrogen or natural gas.
The electrolytically generated hydrogen can already be used today as a shield gas enabling annealing processes to be used for steel production and replaces fossil-based hydrogen. In the future, naturally with significantly larger capacities, use as a substitute for carbon for the direct reduction of iron oxide is feasible.
Along with the proof of electrical efficiencies of more than 80% (in terms of calorific value), the test operation of the techno-economic assessment of the technology also serves as proof in the context of competitive hydrogen production.