I am planning out sustainable urbanism for low income communities and was inundated with Bucky thoughts that brought me to this:
How about a 'pneumatic transport system' using air generated by direct and stored wind power.
Berkeley - Pneumatic transportation uses compressed air for propulsion; air is blown through an airtight tube, propelling a capsule, canister or other vessel. It has had some success, although efforts to use it to transport people have failed.
Seriously off peak wind and tidal storage is not a 'issue',
just a resource to be managed.
That is sooo 1800's tech ;-)