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The “Duck Curve” describes a major challenge in solar energy conversion – intermittency. The larger the duck’s belly, the more challenging it becomes for grid and conventional power plant operators to maintain a stable electric grid.
http://www.forbes.com/sites/williampentland/2015/02/07/is-solar-the-next-shale/
http://instituteforenergyresearch.org/solar-energys-duck-curve/
Esposito Research Group Blog 