Did Elon Musk ever finish building his batteries in SA?[/quote]
Looks like l have some reading to catch up on
https://www.abc.net.au/n...y-finished-in-sa/9183868

I found this clip but it is 2017

Tesla has completed construction of its giant lithium ion battery, described as the world's most powerful, with testing expected in coming days ahead of a December 1 operation deadline.

The array of Tesla Powerpack batteries has been installed alongside French company Neoen's Hornsdale windfarm near Jamestown in South Australia's Mid North region.

South Australian taxpayers will spend up to $50 million subsidising the 100-megawatt battery.

In return, the SA Government will have access to some of the battery's output to provide stability services to the grid.

The Government will also have the right to tap the battery's full output to prevent load shedding blackouts if supply runs low this summer.

Load shedding happens when the market operator (AEMO) directs power providers to switch off supply to some customers to protect the grid.

The new battery will produce enough energy to power about 30,000 homes for a little over an hour.
What will the battery do?

The battery is privately owned by Neoen in partnership with Tesla. 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.