Model your annual True-Up bills and battery storage economics under Oncor Electric Delivery (Texas) ERCOT Retail Market Free Choice with peak import rates ($0.19/kWh) and Avoided Cost export credits.
Calculate annual True-Up bills and battery storage ROI under Oncor Electric Delivery (Texas) 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 $670 (Solar Only) to $286 (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: PUCT Substantive Rule § 25.214
Deregulated ERCOT market rewards wholesale price spike battery discharge.
Under ERCOT Retail Market Free Choice, solar energy exported during midday earns approximately $0.04/kWh while evening grid consumption costs $0.19/kWh, making home battery storage essential.
The fixed basic service fee is $4.5 per month regardless of net grid energy consumption.
Yes. Storing excess midday generation and discharging during the 1:00 PM – 7:00 PM Summer Peak peak window maximizes overall electrical cost offset.
Explore statutory rules, state benchmarks, and customized calculation models across all 51 jurisdictions.
View side-by-side peak TOU arbitrage economics across PG&E, SCE, and SDG&E.