If you have the Tesla battery I think you can also get onto the Tesla energy plan as well with Octopus which gives you cheap electric and pays better for generation as well.
Are you on that?
The Tesla Energy Plan is an energy tariff specifically designed for homes with solar and Powerwall, offering 100% clean electricity. Calculate your savings now.
octopus.energy
I looked into it because upfront cost is insane but it makes both usage and generation cheaper whilst also giving you a whole home UPS in case of power cuts. However I did not wish to be so tied into one eco-system, if they ever adjusted it negatively you'd have no choice but to accept it.
Battery alone was around £8K minimum and I think there is some kind of waiting list now to get one.