A green hydrogen PEM electrolyzer is an important device for producing green hydrogen. PEM stands for proton - exchange membrane. This type of electrolyzer uses a proton - exchange membrane as the electrolyte, which has the characteristics of high electrolysis efficiency (usually can reach more than 80 %), fast response speed, and high - purity hydrogen production. It is very suitable for coupling with renewable energy sources, such as wind power and photovoltaic power. For example, when connected to a solar power system, it can quickly adjust the electrolysis speed according to the change of solar power, and efficiently produce green hydrogen. Accelera will supply a 100 - megawatt PEM electrolyzer system for BP ’s Lingen green hydrogen project in Germany, which will be powered by renewable electricity from offshore wind, and is expected to produce up to 11,000 tons of green hydrogen per year.