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You have a CCA (SBCE) so you end with the split between the transmission+distribution costs from SCE and the generation cost from SBCE. What you actual costs are will depend very heavily on if you are a net consumer (both $$ and kWh) or a net generator (both $$ and kWh).
If you get to net $0 and 0 kWh at your annual true-up(s), you will pay at least the following:
- Minimum Daily Charges (MDC) (PG&E is $0.34810/day)
- Non-Bypassable Charges (NBC) on all imported kWh (PG&E is $0.02666/kWh)
- Power Charge Indifference Adjustment (PCIA) on imported-exported kWh (for PG&E it depends on the year and mine is $0.01985/kWh)
- Franchise Fee Surcharge (FFS) on imported-exported kWh (PG&E is $0.00048/kWh)
Your monthly payment of MDCs offsets your NBCs, but not PCIA or FFS. You owe SCE max(0,NBC-MDC) plus the PCIA and FFS. Since you are $0 and 0 kWh you don’t owe SBCE anything.
If you are a net generator and exported more kWh then you imported, then your NEM balance for SCE Trans+Dist and SBCE Gen should be negative, so you again for SCE you owe max(0,NBC-MDC) and SBCE as a nice SCE carries for the credit to the new year or send you a check based on their surplus generation rules and both balances reset to $0.
If you are a net consumer and imported more kWh than you exported, then your NEM balance for SCE Trans+Dist and SBCE Gen should be positive and those balances are what you would be paying minus the MDCs that you paid to SCE plus the NBCs on everything that all of the kWh that you imported.
Basically get as much solar on your house as you can, be cautious with your imports, but don’t worry about it too much. I am a net generator and I paid just the MDCs over the year and my CCA cut me a check for $306 as my NBCs were lower than the MDCs. If you divide the MDC/NBC it comes to 13.1 kWh that you can on average import every day and not pay a cent more as a net generator.
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