The biggest challenge facing wind energy is intermittency. Wind often blows strongest when power demand is lowest, and weakest when electricity is needed the most. Because today's power grid needs electricity to be consumed the moment it's generated, that means wind turbines send electricity to the grid half as often as an average coal plant.

But what if wind farms could store the power that isn't needed right away and sell it later when demand is high? Correspondent Patty Kim visits a new battery storage system built alongside a wind farm in the heart of coal country.

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