It allows you to store large amounts of energy when energy is cheap.

Don't need to convert it back. Hydrogen is used for example in steel making. Green steel eliminates most of the emissions from the steel making process.

While a lot of these processes may not be efficient for electricity generation, using them to clean up very emission intensive industries is a process that needs to be undertaken to reduce emissions worldwide.

The steel industry consumes 5.9% of global energy and emits 6-9% of global CO2 emissions.