The hope of hydogren is that it is a fungible medium for energy in the way that petroeum is.  In a liquid state you can make hydrogen fit into a container of any size, and it can come from a diversity of sources.

Right now almost all renewable energy as to be used at the time that it's made, there's not an efficient way to store the energy (biomass and hydropower.  And with techologies like wind and solar, you have to have a diversified sourcing of electricity and a fossil fuel backup. There's an expensive duplication of infrastructure.

Nonetheless, as I expect Jerome will point out, the bottleneck in a hydrogen economy would be the platinum used in fuel cells.

And I'll give my consent to any government that does not deny a man a living wage-Billy Bragg