It is not meant as a fuel necessarily. The big consumers today are chemical companies, which use it as a base product for a lot of their production. The other big ones is the steel industry. Hydrogen can be used to create iron from iron ore. That is already done on industrial scale. The big problem is that for a lot of it hydrogen is produced using natural gas, which is extremely polluting.

There are some other maybe intressting things, but green hydrogen is very likely to be a key part of the green transition.