ITM Power plc designs, manufactures, and integrates electrolysers based on proton exchange membrane technology to produce green hydrogen using renewable electricity and tap water. Hydrogen produced via electrolysis is used for mobility, Power-to-X, and industry. The company floated on the Alternative Investment Market in 2004, becoming the first hydrogen company publicly listed on the London Stock Exchange. LSE has also granted the company a Green Economy Mark. ITM Power is headquartered in Sheffield within the world's largest electrolyser factory. It also operates from a further two Sheffield-based sites and an office located in Hesse, Germany. Wikipedia