Salzgitter steel plant in Germany
Largest high-temperature electrolyser sets efficiency record
SOE technology used by German steelmaker Salzgitter consumes less power than conventional electrolysers, manufacturer Sunfire says
The world’s largest high-temperature electrolyser, deployed by steelmaker Salzgitter under an EU-funded green hydrogen project called Grinhy2.0, has achieved record efficiency levels. The electrolyser, which was developed and manufactured by German manufacturer Sunfire, uses solid oxide electrolysis (SOE) technology and draws on waste heat from Salzgitter’s steelmaking process. The electrolyser produced 200m³/hr of green hydrogen at an electrical efficiency of 84pc el,LHV—a measure of the energy contained within the hydrogen compared with the electricity used to make it. More established technologies such as alkaline electrolysis (AE) or proton-exchange-membrane electrolysis typically reach
Also in this section
23 December 2025
Government backing and inflow of private capital point to breakthrough year for rising star of the country’s clean energy sector
19 December 2025
The hydrogen industry faces an important choice: coordinated co-evolution or patched-together piecemeal development. The way forward is integrated co-evolution, and freight corridors are a good example
10 December 2025
Project developer Meld Energy ready to accelerate 100MW project in Humber region after securing investment from energy transition arm of private equity firm Schroders Capital
9 December 2025
BP and Engie abandon large-scale green hydrogen projects in Gulf state as developers in all regions continue to struggle with lack of firm offtake
