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Many of us take “the grid” for granted — but without it, society would cease to function. Our homes, offices and communities all depend on the energy infrastructure to supply a reliable, steady stream of power. Yet every grid has its limitations…. “When too much energy wants to flow, they will overheat – just as in every home there is a fuse and that will simply shut off.” … When it comes to renewables like solar and wind, the challenges facing energy storage are manifold, because while these sources are good for the planet, they do not promise a constant stream of power.

http://www.cnbc.com/id/102766915