My original PV system dates back to 11/2015. I have been on NEM 1.0 and TOU-D-A since that time. 2/2020: added 2 Powerwalls, remained on NEM 1.0 + TOU-D-A 2/2021: added 15 more solar panels and 1 Powerwall; currently in PTO process My question is, would I be able to keep NEM 1.0 once I receive PTO this time around? Or would I be forced onto NEM 2.0? I realize 2.0 is not that terrible, but just wanted to see if others in the community had experience or knowledge on this. As a side note, I expect to lose TOU-D-A and be forced onto one of the newer TOU rate plans any day now.
Your going to be forced onto NEM 2.0. If your system size changes more than 10% or 1kW I believe is what it says. You can basically fix a panel, but adding is going to force you onto NEM 2.0
@jjrandorin is correct. This is the same rule as PG&E. I have discovered that according to PG&E it is the CEC AC watts that govern the calculation. This is the CEC DC panel watts times the CEC inverter efficiency. SCE NEM tariff is here: https://www.sce.com/sites/default/files/inline-files/ce158-12.pdf See sheet 28.
I think you can get a 2nd meter and have both the old system on nem 1 and new on nem 2 but cost will be likely be more than just paying your 2-3c nbc especially if your 3 powerwalls allow you to have low grid usage
Thanks for all the input. Will probably just transition the entire system to NEM 2.0 as suggested. Definitely going to miss that sweet TOU-D-A rate plan though.