Hi, I applaude your interest in non-carbon renewable energy.
Here is an alternative plan: Take a windmill and make loys of compressed air, and store it under ground using the granite below as an high pressure air flask. Use the compressed air to run your car. The French and the Aussies have developed an efficient engine which utilizes highly compressed air.
Less than 5 minutes to tank up. No polution whatever. Sparkling performance.
You could drill into the granite for 1000 feet, send down a silicone balloon,
and under-cut the stone 20 feet below the surface for the assembled stop
port. There you have an air flask that will endure for many,many years.
No corrosion. You can do all kinds of things with compressed air.
In the future, compressed air will become an energy commodity like oil or electricity or gas. And.....it's clean.
Just a thought.
Best regards, Dan