Model your annual True-Up bills and battery storage economics under Southern California Edison (SCE) TOU-D-PRIME (Clean Energy & Storage Tariff) with peak import rates ($0.54/kWh) and Avoided Cost export credits.
Calculate annual True-Up bills and battery storage ROI under Southern California Edison (SCE) avoided-cost export rates and peak evening TOU tariffs.
US average is ~28–32 kWh/day (~900 kWh/month)
0 kWh (No Battery) · 13.5 kWh (1 Unit) · 27 kWh (2 Units)
4 PM to 9 PM utility rate (PG&E / SDGE / SCE)
Avoided cost wholesale rate paid for excess day exports
True-Up bill drops from $2,103 (Solar Only) to $772 (Solar + Battery).
| Tier / Setup | Solar Array | Storage | Solar Only True-Up | With Battery True-Up | Action |
|---|---|---|---|---|---|
| Modest Home / Starter | 6 kW | 10 kWh | $1,380/yr | $290/yr | Apply |
| Suburban Median (1 Battery) | 8 kW | 13.5 kWh | $1,950/yr | $410/yr | Apply |
| High Consumption + EV | 11 kW | 20 kWh | $2,890/yr | $620/yr | Apply |
| All-Electric Home (2 Powerwalls) | 14 kW | 27 kWh | $3,740/yr | $780/yr | Apply |
Residential battery storage systems of 3 kWh or greater qualify for the 30% Federal Residential Clean Energy Credit, even when installed without new solar panels. Under NEM 3.0, programming your battery inverter for "Self-Supply / Arbitrage" rather than pure backup is essential to maximize payback speed.
CPUC Filing Authority: CPUC Schedule TOU-D-PRIME & Net Billing Tariff (NBT) Resolution
SCE TOU-D-PRIME features a wide rate differential ($0.28/kWh delta between off-peak and on-peak). Storing daytime solar in an LFP battery to serve evening HVAC and household loads delivers a 6.8-year payback period under the 30% Federal ITC.
TOU-D-PRIME provides discounted off-peak electricity ($0.26/kWh) while charging a premium $0.54/kWh during 4 PM to 9 PM on-peak hours. Your home battery discharges during on-peak hours to zero out high-cost grid imports.
View side-by-side peak TOU arbitrage economics across PG&E, SCE, and SDG&E.