Arizona (AZ) • Salt River Project (SRP — Phoenix East Valley, Mesa, Chandler, Gilbert, Tempe)Min Backup Reserve: 20% Reserve
SRP Arizona Battery Storage Incentive & Demand Response VPP Guide
Salt River Project (SRP) in the Phoenix metro area penalizes solar homeowners with steep 2:00 PM – 8:00 PM Summer Peak Demand Charges (up to $34.19/kW on the E-27 plan!), while offering upfront rebates for batteries that shave afternoon peak load.
Upfront Enrollment Rebate
Up to $3,600 Upfront Cash Rebate ($300/kWh for participating data/dispatch pilot)
Annual Recurring Payout
$1,400 – $2,200 / Year in E-27 / E-15 Demand Charge Shaving Savings
Dispatch Season & Window
May – October (2:00 PM – 8:00 PM SRP Summer Peak Window)
1. Annual & 5-Year VPP Earnings Breakdown by Battery Size
Open Interactive VPP Calculator →Compensation Formula: Upfront per-kWh cash rebate upon installation + Summer Peak Demand reduction
| Home Battery Configuration | Estimated Annual VPP Payout | 5-Year Cumulative Value |
|---|---|---|
| 14.3 kWh LFP Battery + Demand Load Controller on SRP E-27 | Up to $1,800/yr Demand Savings | $9,000+ Saved on E-27 |
| 28.6 kWh Dual LFP Battery Bank (Zero 2 PM–8 PM Grid kW) | Up to $2,600/yr Demand Savings | $13,000+ Saved + Upfront Rebate |
2. VPP Dispatch Rules, Backup Reserves & Aggregator Fine Print
- 1Why SRP’s E-27 Solar Demand Plan Is a Goldmine WITH a Battery (and a Trap WITHOUT One): On SRP’s E-27 Customer Generation Price Plan, electricity energy charges are dirt-cheap (3.9¢ to 6.3¢/kWh!), UNLESS you pull high kW demand between 2:00 PM and 8:00 PM in summer (where demand above 3 kW costs $19.42/kW and above 10 kW costs $34.19/kW!).
- 2Holding SRP 2 PM–8 PM Grid Demand at 0.0 kW: By pairing an EG4 18kPV + 28.6 kWh LFP battery with a Micro-Air EasyStart on your Phoenix 5-ton A/C, your battery + afternoon solar covers 100% of the 2 PM–8 PM window—keeping your SRP peak demand at 0.0 kW and giving you the lowest electric bills in Arizona!
Recommended Homeowner-Owned Battery Setup
EG4 18kPV (Peak-Shaving 0.0 kW Demand Mode) + 2x 14.3kWh PowerPro
✓ Powerwall✓ Enphase✓ FranklinWH✓ SolarEdge✓ EG4 / EcoFlow
Salt River Project (SRP) Residential Battery Storage Incentive FAQ
Which SRP solar plan is best if I have a 28.6 kWh battery—Customer Generation (E-27) or Average Demand (E-15)?
With a 28.6 kWh battery and a 12 kW hybrid inverter programmed in Peak Shaving mode, the E-27 Customer Generation plan or Time-of-Use Export plan lets you eliminate the 2 PM–8 PM peak demand spike while enjoying ~4.5¢/kWh off-peak energy rates!
Can I also claim the $1,000 Arizona State Solar Tax Credit on SRP?
Yes, Arizona provides a 25% state income tax credit capped at $1,000 on top of the 30% Federal Residential Clean Energy Credit.
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