Tesla is now offering a Tesla Energy Plan where you become part of the Tesla Virtual Power Plant in South Australia.
www.tesla.com
It looks like the Cliffs Notes are:

Tesla Energy Plan | Tesla Australia
Tesla is excited to participate in the South Australia Home Battery Scheme, making South Australia’s grid stronger, cleaner and more cost-effective for everyone.

It looks like the Cliffs Notes are:
- Tesla remotely controls your Powerwall charging/discharging as part of the VPP;
- $220 (inc. GST) of "grid support" credits each year, per Powerwall, for being part of the VPP;
- Supply charge 99c/day;
- A Time-Of-Use tariff - Peak (6am-10am & 3pm-1am) 31.13c/kWh, Solar Sponge (10am-3pm) 16.5c/kWh, Off-peak (1am-6am) 21.99c/kWh;
- Solar FIT of 7.5c/kWh for first 1500kWh/month (2.5c/kWh for exports above that);
- You have to have both Solar PV and a Powerwall 2.