I would like such a thing to be open access and not involve Tesla at all. I should be able to profitably sell to the grid as a random person if there's need.
With that said, you can operate autonomously on the grid with solar and batteries (and the inverters will sync and follow grid voltage and frequency), and can even use export restrictions so you never send power back to the grid (curtailing) if desired; but energy marketplace participation is much more than that. Enphase and SolarEdge (inverter and energy system manufacturers) are positioned as competitors to Tesla for VPPs, but haven’t made the effort (that I’m aware of).
1. https://clean-coalition.org/distribution-system-operator-dso...
[1] https://www.solarquotes.com.au/battery-storage/vpp-compariso...