All APS Demand Response Programs Explained: Cool Reward, Reserve, & More
APS runs several programs that pay homeowners for participating in grid management. If you have a battery (or are thinking about getting one), these programs can significantly improve your ROI. Here's every program available in 2026 and how they work together.
APS Cool Reward (Battery Demand Response)
This is the big one — APS's flagship Virtual Power Plant (VPP) program for residential battery owners.
- How it works: APS dispatches your battery during peak grid demand (typically summer afternoons). Your battery sends stored energy to the grid instead of APS firing up expensive peaker plants
- What you earn: $150-$500/year depending on battery size and dispatch frequency
- Dispatch events: ~15 per year, mostly June-September during extreme heat
- Battery refill: Your battery recharges overnight at off-peak rates, so backup power is always available
- Installation rebate: $3,750 one-time rebate for installing a qualifying battery
- Qualifying batteries: Tesla Powerwall, Enphase IQ, Generac PWRcell, and others that meet APS communication requirements
APS Reserve (Grid Services)
APS Reserve is a newer program that goes beyond simple peak shaving. Your battery provides frequency regulation and grid stabilization services.
- How it works: Your battery responds to real-time grid signals, absorbing or releasing small amounts of energy to maintain grid frequency
- Additional earnings: Stacks on top of Cool Reward payments
- Requirements: Compatible inverter with grid-services firmware, reliable internet connection
- Availability: Currently expanding across the APS service territory
APS Smart Thermostat Program
Don't have a battery yet? APS also pays you to let them adjust your smart thermostat during peak events.
- Earning: $25-$75/year in bill credits
- How it works: APS raises your thermostat set point by 2-4°F during peak events (you can opt out of individual events)
- Compatible thermostats: Nest, ecobee, Honeywell, and others
- Best for: Homeowners without batteries who want to earn something from demand response
How to Stack Programs for Maximum Earnings
The best strategy combines multiple programs:
| Program | Annual Value | One-Time Bonus | Requires |
|---|---|---|---|
| Cool Reward (VPP) | $150-$500 | $3,750 rebate | Battery |
| APS Reserve | $50-$150 | — | Battery + firmware |
| Smart Thermostat | $25-$75 | — | Smart thermostat |
| TOU Arbitrage (self) | $500-$1,100 | — | Battery + solar |
| Total potential | $725-$1,825/yr | $3,750 |
Combined with the 30% federal battery ITC and AZ state credit, a battery system can pay for itself in 3-5 years when you stack all available programs.
How to Enroll
- Install a qualifying battery — Your installer should handle APS interconnection paperwork
- Sign up for Cool Reward — Available through the APS app or website after your battery is commissioned
- Enable APS Reserve — Check with your battery manufacturer for firmware compatibility
- Add smart thermostat — Enroll through the APS Marketplace for additional credits
See exactly how much a battery would earn you with our battery + VPP calculator — it models Cool Reward earnings and TOU arbitrage for your specific setup.