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Project Overview

The European Commission and its roadmap for moving towards a competitive low-carbon economy in 2050 sets greenhouse gas emissions targets for different economic sector. One of the main challenges of transforming Europe´s economy will be the integration of highly volatile renewable energy sources.

However, access to renewable electricity will also be a limiting factor in the future and energy efficient technologies the key. Due to a significant energy input in form of steam preferably from industrial waste heat, Steam Electrolysis based on Solid Oxide Electrolysis Cells (SOEC) achieves outstanding electrical efficiencies.

GrInHy2.0 leads on seamlessly from the first stage of GrInHy which has already operated successfully in Salzgitter. Together with partners Sunfire GmbH, Paul Wurth S.A., Tenova SpA, French research center CEA and Salzgitter Mannesmann Forschung GmbH, the world’s most powerful Steam Electrolyser (StE) is being constructed for the energyefficient production of hydrogen. The GrInHy2.0 project (Green Industrial Hydrogen via steam electrolysis) has an overall budget of € 5.5 million.

GrInHy2.0 marks the first implementation of a high-temperature electrolyzer with an electrical power input of 720 kilowatt in an industrial environment. By the end of 2022 it is expected to have been in operation for at least 13,000 hours, producing a total of around 100 tonnes of high-purity (99.98 %) hydrogen. This will be used for annealing processes in the integrated steelworks as a replacement for hydrogen produced from natural gas.


GrInHy2.0 is the successor of the GrInHy project (03/2016 - 02/2019).
More information about GrInHy...



  1. Electrolyser scale-up to 720 kWel,AC producing 200 Nm³/h (18 kg/h)
  2. Electrical electrolyser efficiency up to 
    84 %el,LHV (< 40 kWhel,AC/kg)
  3. > 13,000 operating hours at system level with a proved availability of > 95 % 
  4. > 20,000 operating hours at stack level
  5. Demonstrate hot start from minimum to maximum power in < 5 mins


  1. Produce >100 tons of green hydrogen at under 7 €/kgH2
  2. Reduce electrolyser CAPEX to <4,500 €/(kgH2/d)
  3. Provide techno-economic studies for further market deployment


  1. Create viable technology by demonstration in a complex industrial environment
  2. Assess CO2 avoidance potential of a hydrogen-based European steel industry
  3. Provide significant share of green hydrogen to the iron-and-steel works
  4. Evaluate situation on purchasing renewable electricity and green H2 certification

Latest News

Sunfire has successfully delivered the world’s most powerful High-Temperature Electrolyzer (HTE) for highly energy-efficient hydrogen production to…

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After successfully commissioning the new stack test bench, CEA started in its labs the long-term test of Sunfire's SOEC stack. The stack will be in…

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Since the GrInHy2.0 prototype system consists of many , good planning is essential to speed up installation and the completion of the Site Acceptance…

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