All APS Demand Response Programs Explained: Cool Reward, Reserve, & More

APS runs several programs that pay homeowners for participating in grid management. If you already have a battery (or are thinking about getting one) these programs can meaningfully improve the ROI on a $10,000 to $15,000 investment. There are also non-battery options worth knowing about. This guide catalogs every APS demand response program available to residential customers in 2026, what each one pays, who qualifies, and how to stack them for maximum annual earnings. For the full deep dive on the largest program by dollar value, see our APS Virtual Power Plant guide.

APS Cool Reward (battery demand response, the headline program)

Cool Reward is APS's flagship demand response program, and the one most Arizona homeowners encounter first. It is technically the residential layer of APS's broader virtual power plant. When grid demand peaks, APS dispatches enrolled batteries to push stored energy onto the grid instead of firing up natural-gas peaker plants.

• How it works: APS dispatches your enrolled battery during peak grid demand, typically 4 to 7pm on the hottest summer afternoons. Your battery pushes stored energy to the grid for 2 to 3 hours, then refills overnight at off-peak rates.
• What you earn: $150 to $500 per year, depending on battery size, dispatch frequency, and how much capacity you allow APS to use per event.
• Dispatch events: About 15 per year, mostly June through September during extreme heat. APS sends day-ahead notifications.
• Battery refill: Your battery recharges overnight at off-peak rates, so backup power is available for the next day.
• Installation rebate: $3,750 one-time rebate paid as a check or APS bill credit within 60 to 90 days of installation verification.
• Qualifying batteries: Tesla Powerwall 2 and 3, Enphase IQ Battery 5P/10/10T, FranklinWH aPower 2, Generac PWRcell, SunPower SunVault, and others that meet APS communication requirements.

For the per-event walkthrough, the household-by-household earnings table, the full incentive stack math, and honest tradeoffs around battery cycle wear and aggregator lock-in, see the dedicated Cool Reward and VPP explainer.

APS Reserve (grid services, the smaller add-on)

APS Reserve is a newer, more technical program that goes beyond simple peak shaving. Enrolled batteries provide frequency regulation and grid stabilization services, responding to real-time grid signals throughout the day rather than just during scheduled dispatch windows.

• How it works: Your battery responds to real-time grid frequency signals, absorbing or releasing small amounts of energy to keep the grid balanced. Most of these adjustments happen in seconds and are essentially invisible to the homeowner.
• What you earn: $50 to $150 per year, stacking on top of Cool Reward payments.
• Requirements: Compatible inverter with grid-services firmware (most modern Tesla, Enphase, and FranklinWH systems qualify), reliable internet connection.
• Availability: Currently expanding across the APS service territory. Some installers will know about it, some will not. Ask your installer specifically before commissioning.
• Battery wear note: Frequency regulation is generally low-cycle (small, frequent charge and discharge increments). Wear impact is meaningfully lower than Cool Reward dispatch events.

APS Reserve is designed to stack on top of Cool Reward, not replace it. Most Cool Reward enrollees should also enable APS Reserve once their battery is commissioned. The dollar value is smaller, but it is essentially free additional income for an already-installed system.

APS Smart Thermostat Program (no battery required)

For homeowners without a battery, APS still offers a way to earn credits. Enrolling a smart thermostat in the APS Marketplace lets APS adjust the set point by 2 to 4°F during peak events. The dollar value is small, but the cost of participation is essentially zero, and individual events can be overridden with a single tap.

• What you earn: $25 to $75 per year in bill credits.
• How it works: APS raises your thermostat set point by 2 to 4°F during peak events. You can opt out of any individual event through your thermostat app.
• Compatible thermostats: ecobee, Nest, Honeywell, and others certified through the APS Marketplace.
• Best for: Renters and homeowners without batteries who want a low-effort way to participate in demand response. Also a good first step before investing in solar or storage.
• Tradeoff: The temperature adjustment is small but real. If you have someone home during peak hours who is sensitive to small temperature changes, you may end up overriding events frequently.

How to stack programs for maximum earnings

The best annual return comes from combining all eligible programs with daily TOU arbitrage savings. The math:

Combined with the 30% federal battery ITC and Arizona's 25% state credit (capped at $1,000), a battery system can pay for itself in 3 to 5 years when all available programs are stacked. See our tax credit guide for the current incentive landscape.

Eligibility by household type

Quick reference for figuring out which programs apply to your situation:

• Solar plus battery (most common): Cool Reward + APS Reserve + Smart Thermostat. All three programs stack. Highest combined annual value.
• Battery without solar (standalone): Cool Reward + APS Reserve + Smart Thermostat. Same stack as above. The battery does not need solar to participate in any APS demand response program. See our battery-without-solar guide for the standalone math.
• Solar without battery: Smart Thermostat only. Solar exports already provide value through net billing, but that is not a demand response program. There is no current APS program that pays solar-only homes for export timing.
• Renter or no battery, no solar: Smart Thermostat only. The smallest dollar value but the lowest barrier. Worth doing if you have a compatible thermostat already installed.
• Outside APS service territory: None of these apply. SRP runs different battery programs and has its own structure (see our SRP rates guide). ED3 runs Peak Rewards in Maricopa.

How to enroll

1. Install a qualifying battery through an APS Cool Reward–authorized installer. The installer files the rebate paperwork with APS on your behalf and handles the interconnection application.
2. Sign up for Cool Reward through the APS app or web account after your battery is commissioned. This step is required before any dispatch events can run.
3. Enable APS Reserve by confirming firmware compatibility with your battery manufacturer (Tesla, Enphase, FranklinWH, etc.) and opting in through the manufacturer's app or APS account.
4. Add a smart thermostat and enroll it through the APS Marketplace for additional credits, even if you also have a battery.
5. Track payments annually. Cool Reward and APS Reserve usually settle through your battery aggregator (quarterly). Smart Thermostat credits appear directly on your APS bill.

Honest tradeoffs to consider before enrolling

The marketing materials lean heavily on upside. A few factors worth weighing:

• Battery cycle wear: Cool Reward dispatch events are deeper-than-normal cycles. APS Reserve cycles are smaller. Both are real, both are minor relative to LFP battery cycle ratings (6,000 to 10,000 cycles), but they are not free.
• Backup readiness during event windows: If a grid outage hits during or right after a dispatch event, your battery has less stored energy. Most aggregators reserve a 20 to 30% buffer for exactly this reason.
• Smart Thermostat comfort: A 2 to 4°F bump during peak is noticeable in Arizona summer afternoons. People with medical conditions sensitive to heat should not enroll without medical-exemption opt-out.
• Tax treatment varies: Some payments are 1099-MISC reportable income. Some are bill credits. Talk to a tax professional before assuming the after-tax number.
• Program rates change: The earnings ranges in this article reflect 2026 tariffs. APS or the Arizona Corporation Commission can revise rates downward if program enrollment exceeds targets.

None of these are deal-breakers for most households. They are simply the things a thorough decision should weigh, not just the headline annual earnings number.

See exactly how much a battery would earn for your specific situation in our battery and VPP calculator. It models Cool Reward earnings, APS Reserve, and TOU arbitrage against current 2026 rates.