[hannob]

Your statement only makes sense if you have the strange assumption that something that is a good solution for an isolated island is also a good solution for everybody else. On large continental grids you can do a lot of things to reduce the need for battery storage, e.g. transporting power over distances, demand side management in large factories and using other terrain-dependent storage technologies like pumped water storage.

[allan_]

Well, tesla plays with that "solution for everybody" itself. They even have a solution for the beginning of mankind dominating the whole universe.