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A 100 MW/129 MWh Tesla battery bank,
. . . to smooth out power fluctuations from South Australia's Hornsdale Wind Farm, and
. . . will provide power during peak demand hours.

As the critics are fond of reiterating,
. . . the wind doesn't blow all the time,
. . . but when it delivers, it frequently exceeds the immediate demand.
. . . The batteries absorb excess power, and
. . . give it back when the turbines aren't producing as much as needed.
The Powerpack's AC round-trip efficiency is just shy of 90%.

7-10-2017 Source:  #Australia 100 MW Battery bank