Christoph Noeres, head of green hydrogen at ThyssenKrupp Nucera, which makes electrolyzers, at the company’s headquarters in Dortmund, Germany, March 20, 2024. Nucera, a subsidiary of ThyssenKrupp, Germany’s venerable steel producer, is landing major deals for electrolyzers, which produce clean-burning hydrogen from water. (Felix Schmitt/The New York Times)
