r/solar
I analyzed 1.5 years of PG&E + CCA (SVCE) NEM 3.0 bills. Emptying your battery to chase the $3/kWh September power hours is a mathematical trap.
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TL;DR: If you are on California's NEM 3.0 (Solar Billing Plan) with PG&E and a Community Choice Aggregator (like SVCE, Peninsula Clean Energy, Ava, or MCE), stop letting your battery empty itself to the grid from 6:00 PM – 8:00 PM in August and September. It is not a financially viable option. [Disclaimer before you read any further: Yes I used AI Agents to do this deep analysis. I found the analysis to be very insightful. I spent several hours and a lot of my own brain cycles while *using* the AI tool to do this analysis.. Yes, I used AI agent to generate this output. If you hate AI and want to ignore the message and pile onto the messenger for using a tool that you disapprove, please stop here. Do not read any further. If you are interested in the analysis, please continue.] Tesla's Time-Based Control ("Savings Mode") sees the ~$3.00/kWh September export spike and dumps your Powerwall down to 20% by 8:00 PM. What the algorithm misses is that ~95% of that $3.00/kWh credit goes into the Generation bucket - which you cannot use to pay for PG&E Delivery charges, and which gets wiped out at True-Up. Meanwhile, because your battery is now empty at 8:00 PM, your house has to buy electricity back from PG&E all night long at ~27 to 30 cents/kWh in real cash delivery charges. I went through 1.5 years of my PG&E + Silicon Valley Clean Energy (SVCE) bills to see why my bills were...
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Under PG&E's NEM 3.0 (E-ELEC Solar Billing Plan), your electric bill is split into two separate buckets that can never mix (printed right on Page 4 of every PG&E statement):
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Every extra dollar of Generation credit you generate by emptying your battery at 7:00 PM in September is 100% unusable \"paper money.\"
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Dumping the battery made my September PG&E bill jump from ~$1 to ~$34 in real cash (~$20 worse than if the battery had just powered my house overnight)...
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