Hydrolysis can be used to produce hydrogen in a climate-neutral way. For this purpose, electricity from renewable sources, such as wind or sun, is used to split water into oxygen and hydrogen. The CO2-free hydrogen produced in this way is gaseous and can be fed into the existing gas infrastructure. In this way, excess renewable energy that is not required in the power grid during production can be stored in the form of green hydrogen and used as needed. The technology is referred to as power-to-gas.