elon's battery for SA cost $66m, page-3

What will the battery do?
In normal circumstances, the battery will be charged with power from the nearby Hornsdale windfarm when power is plentiful and cheap.

The operators will then have the right to sell some of it back into the grid when the supply-demand balance is tighter and prices are higher.

The SA Government will be able to use a portion of the battery's output to provide stability services to the grid.

There is a market for these services, but in South Australia there is limited competition. At times when South Australia can't import stability services from across the interconnector to Victoria, the state pays extraordinary prices, which drive up bills for households and businesses.

The Government expects the battery to bring new competition to that market.

In addition, the Government will have the right to tap the battery's entire output if the state is running low on power and load shedding is imminent.

Coupled with the state's newly installed fleet of backup diesel generators, the battery could stop thousands of households unexpectedly losing power for half an hour or so on a hot summer's afternoon.
http://www.abc.net.au/news/2017-11-...ul-lithium-ion-battery-finished-in-sa/9183868