http://www.bloomberg.com/news/2014-10-13/giant-battery-unit-aims-at-wind-storage-holy-grail-commodities.html
"Electric-car battery prices already have fallen by 50 percent since 2010 to about $500 per kilowatt hour, and “by drawing on auto-battery technology, battery makers may also be able to supply storage batteries at a lower price,” Citigroup said in a Sept. 25 report. Tesla Chairman Elon Musk said in July that battery packs for electric cars will drop to $100 in the next 10 years."
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