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Lithium batteries are in no way going to be so inefficient as to have a 50% loss of energy. They're already cost competitive in Hawaii for utility scale storage:

http://www.utilitydive.com/news/hawaii-co-op-solarcity-ink-d...




What happens when when 52MWh (~216 tons of lithium iron batteries) goes into thermal runaway?


You don't have have to put all of the 52MWh side-by-side.




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