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A comment on Oil Crash is Kicking Off One of the Largest Wealth Transfers in History. Parent comment

Re:Oil Crash is Kicking Off One of the Largest Wealth Transf... by binarypaean on Tuesday February 02, 2016 @03:38PM (#11022324)
Round-trip energy efficiency is reported to be > 80% for pumped-hydro energy storage.

Ecological, space, and financial efficiency are more variable.

http://energystorage.org/energy-storage/technologies/pumped-...

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