SCE NEM 1.0 grandfathering when adding more panels?

[Dukeybootie]

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.

 

[jjrandorin]

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

 

[h2ofun]

Yep, nem 2.0 now and new rate plan. I wonder if you get new-mt with the PW and ev2-a TOU?

 

[miimura]

@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.

 

[miimura]

Yep, nem 2.0 now and new rate plan. I wonder if you get new-mt with the PW and ev2-a TOU?

He is talking about Southern California Edison, not PG&E.

 

[h2ofun]

He is talking about Southern California Edison, not PG&E.

So they are different? Oh well. I sure would have thought twice about losing NEM1

 

[miimura]

So they are different? Oh well. I sure would have thought twice about losing NEM1

The NEM rules appear to be the same, but their TOU rate schedules are different.

 

[hayhayday]

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

 

[Dukeybootie]

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.