APS Frequently Asked Questions
The APS Storage Rewards pilot is a resource to help support a reliable, affordable and clean energy future. During periods of high demand an event may be called and your battery manufacturer will signal your battery system to discharge stored energy back to the power grid.
To participate in the APS Storage Rewards pilot, you must be an APS residential customer. You must also use a battery storage system operated by an eligible manufacturer, and your battery must perform in accordance with your utility interconnection agreement (IA).
Your battery interconnection application must receive Permission to Operate (PTO) from APS prior to enrolling in the program.
Please see the list of eligible battery manufacturers and models below. You can also reach out to your installer to see if they install one of the supported inverters.
Manufacturer | Eligible Inverters | Eligible Batteries |
|---|---|---|
Fortress Power | eSpire Mini, eSpire 233, eSpire 280 (include battery and inverter) Envy Inverter | eSpire Mini, eSpire 233, eSpire 280 (include battery and inverter) eForce Battery LFP-10 Max, eVault Max 18.5kWh, eFlex 5.4 (need to be paired with Envy interter) |
FranklinWH | FranklinWH aPower X, aPower 2, and aPowerS* | FranklinWH aPower X, aPower 2, and aPowerS* |
Tesla | All solar inverters | Tesla Powerwall 2** Tesla Powerwall+** |
*aPowerS has built-in hybrid inverter while aPower2 and aPower X can be AC-coupled with with any PV-inverter
**Tesla Powerwall has internal inverter
Please contact your battery vendor or installer for more information on which inverter and battery models are best suited for your system.
Provider | Terms and Conditions |
|---|---|
Fortress Power | |
FranklinWH | |
Tesla |
The APS Storage Rewards pilot uses a pay-for-performance structure. By enrolling and participating in the pilot, you can earn $110 per average kW you contribute during an event from your battery to APS throughout the summer season.
Your payment will be based on the average power contribution, in kilowatts (kW), of your battery system throughout all event hours.
Battery system performance will vary based on size, configuration, internet connectivity and other factors. Please contact your battery storage system manufacturer for more information about your battery's expected performance.
For example, a customer who has an average contribution of 2 kW across all events would earn $220 for the season. This is calculated by multiplying the average contribution (2 kW) by the compensation rate of $110 for each kW. So, 2 kW times $110 equals $220.
The example provided below is for illustrative purposes only. The number of events, including the duration of each, will vary based on grid needs. For questions regarding compensation, please email APSStorageRewards@energyhub.com.
Event 1 | Event 2 | Average kW discharged | APS Storage Rewards |
|---|---|---|---|
3kW discharged | 2kW discharged | 2.5kW | 2.5 x $110 = $275 |
You’ll be notified of the date and time of the event beforehand by email, text or other form of communication.
The number of events will vary depending on APS’s grid needs, but no more than 60 events will be called each season, May 1 to October 31. Events may take place on weekdays, weekends and holidays from 4 p.m. to 10 p.m.
Events will range from one hour to four hours.
Once your battery’s performance data has been validated, compensation payments for performance will be processed as a bill credit within one to two APS billing cycles after the end of the season. If your bill credit is more than your APS bill, the remaining balance will roll over to next month.
You can always opt out of events. In addition, some battery vendors can help you configure your system to limit how much your system will discharge during events. Please note, however, that these actions will affect how much your system can earn.
Yes, customers who do not have solar but have an eligible battery system that charges from the power grid may participate in the APS Storage Rewards pilot.
Yes. This ensures your device can be communicated to.
During events, if we cannot communicate with your energy storage system, or if your energy storage system cannot discharge when needed (due to a maintenance issue), the amount earned will be affected.
Leased devices must be compatible with the pilot design and are subject to your lessor contract for any limitations.
Battery partners provide the opportunity to opt out of events. You will need to communicate your intent to opt out of an event using the method provided by your battery partner.
Fortress Power customers can opt out within their Fortress Power App.
FranklinWH customers can opt out within their FranklinWH app by toggling the 'Participate in Event' button under event details.
Tesla customers can opt out within their Tesla app by toggling the 'Virtual Power Plant' button under event details.
Please contact EnergyHub at APSStorageRewards@energyhub.com to unenroll from the program. Please note: If you have a Tesla battery, it may take up to one week for your device to be fully removed from the program. During this time, your device might still take part in an event if one is scheduled.