http://www.renewableenergyworld.com/rea/news/article/2013/04/100-percent...
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http://www.renewablesbiz.com/article/13/04/aps-announces-latest-az-sun-p...
http://www.youtube.com/watch?v=DeLjqY0z09g&sns=em
http://www.huffingtonpost.com/2013/03/28/renewable-energy-storage-in-hyd...
http://online.wsj.com/article/SB1000142412788732478950457838182075330197...
http://www.nytimes.com/2013/03/28/us/dairy-finds-way-to-let-cows-power-t...