Intermittency of Wind Power & the Supergrid

Any honest conversation of the potential of wind ought to mention the intermittency issue. I believe high wind penetration REQUIRES a supergrid. A weather system is typically ~2500 km across, and to get aggregate reliability from pooled wind generators, the grid must AT LEAST access wind turbines in two major weather systems. Such a large grid can also more easily access remote sites where pumped storage or hydropower with variable output is feasible too. In both North America and Europe, the main hydropower potential is in the north; to balance wind with hydro in both Eurasia and North America will require supergrids that reach far up into the north, and which span several weather systems at any one time.