Joined up thinking....
I have thought that for years that hydrogen was better than the electric powered battery models. (although this one is butt ugly).
Those clever chappies in Japan have made a hydrogen station connected to the grid BBC Click
People have been saying for years that the problem with wind \ wave power is that is produces power when it's not needed.
My idea is this :- install one of these hydrogen producing units close by the wind turbines.
When the turbines can produce energy that is not currently needed by the grid it produces hydrogen available for cars to fill up at, or to convert back into electricity for the grid.
No complex transportation of hydrogen around, no massive new infrastructure, just what looks like a couple of containers worth of hardware, installed around in communities that would benefit from cheap fuel.
I've now solved the energy crisis I'm off for a pint!!