What is the value of gas infrastructures in a multi-energy grid?

Gas infrastructures present a number of advantages for multi-energy:

They already exist.
They can take the renewable gases: biomethane, hydrogen, synthetic methane.
Gas, unlike electricity, for example, can be stored in large quantities. Once the surplus energy produced has been transformed into gas (e.g. transforming electricity into hydrogen through electrolysis), it can be stored in the gas storage infrastructures. This process prevents energy losses.