Did you know that superconducting power lines are commercially feasible, right now, for high capacity lines? Negawatt proposals account for a large part of the problem, if you make distribution efficient. And it can be made very efficient using superconducting lines.

For the brief periods where the world's overall wind production is low, if wind ever takes over most of the grid (it probably won't, considering the political dynamics), there is already a very effective storage technology -- liquid hydrogen. It has a practically limitless capacity (just add more tanks), and it avoids the toxicity problem of batteries, and it avoids the materials problem of fuel cells (still, nobody has found something cheap to replace platinum.)