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
Join Australia’s Largest Virtual Power Plant. Purpose Built for Powerwall, Learn about the benefits of the Tesla Virtual Power Plant and the Tesla Energy Plan. Access Grid Support Credits. Competitive Time of Use rates and Feed-in-Tariffs.
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.