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South Australia's Goal . . .  "100% Renewable Energy Grid!"
. . . 20GW  of energy storage, then providing incentives for  
. . . . . . storage at household, and grid level, could translate to
. . . 400GWh of storage, enough to provide sufficient back-up for a nation by 2030.

South Australia, has the highest level of renewable energy penetration,
. . . of any large modern grid, with its demand being meat by:
.  .  . . . . 50% Wind, and
.  . . . . . 7%-8% rooftop solar.

“To have an orderly energy transition away from coal and gas,
. . . we need energy storage throughout the system.”

“This includes batteries in homes, and businesses to reduce demand,
. . . as well as on the grid, to provide frequency control.
. . . We also need small to medium scale pumped hydro,
. . . to provide flexible generation to complement wind and solar.”

The first stage, of the Tesla big battery last week,
. . . when Tesla founder, and CEO Elon Musk revealed that
. . . 1/2 of the project had already been installed.
The quicker we get more renewables into the system,
. . . the better, Musk said.

10-4-2017 Source:  #renewable energy grid