Why Phoenix Solar Homes Still Get High APS Bills in Summer: The On-Peak Timing Problem Explained

Solar panels on your roof work as advertised. They just work on a different schedule than your APS billing clock.

Panels generate the most power around midday. APS charges its highest rates during the late afternoon and early evening on weekdays. That gap between when your system produces and when your home draws the most power is why the bill can still look familiar at the end of the month, even after going solar.

Why the average APS bill in Phoenix stays high after solar

The two peaks do not line up. A typical rooftop system hits maximum output in the middle of the day, when the sun is directly overhead and most homes are at their quietest. Most households use the most power from late afternoon through dinner, when the AC is working hardest, appliances are running, and people are home.

APS's standard residential plan marks its costliest billing window squarely on those weekday afternoon hours, year-round. The plan is called the Time-of-Use 4pm-7pm Weekdays plan. When your panels are winding down toward sunset, your home switches from self-powered to grid-powered at the most expensive moment of the billing day.

The good news is that the mismatch is a timing problem, not a problem with solar itself. That means it has practical solutions.

Where your midday solar output actually goes

During the middle of the day, your system likely produces more power than your home uses. That surplus flows back to the grid and APS credits your account through its net billing program. The credit is real, but what you receive per kilowatt-hour for exported power is a fraction of what you pay when you import during the on-peak window.

The math works better when you consume your solar output directly rather than exporting it. Running the pool pump, dishwasher, or laundry before the on-peak window starts lets you use the cheapest power your system makes. Running those same loads in the evening pulls from the grid at peak rates.

Many homeowners discover this dynamic only after their first post-solar summer bill. The system is doing its job. The question is whether the home's usage habits are set up to match.

Shifting load to stay ahead of on-peak charges

Some on-peak usage is easy to move without buying new equipment:

• Pool pump: most controllers allow a custom run window; shifting it to mid-morning runs on your cheapest power

• Dishwasher and laundry: delay-start settings on most modern appliances push these loads out of the evening window with a few button presses

• Thermostat: setting the house to cool slightly earlier in the day lets it carry thermal mass into the afternoon, reducing how hard the AC works when rates are highest

• EV charging: if you own an EV, APS offers a separate overnight charging plan; enrollment requires calling APS directly

These adjustments change when your home uses power, not how much. For many households, they take a noticeable bite out of monthly on-peak usage with no additional cost.

See our post on APS off-peak hours and load shifting for Phoenix solar owners for a more detailed look at each category.

Battery storage: keeping your solar power until you need it

A home battery changes the equation more fundamentally. Instead of exporting surplus midday solar to the grid at a modest credit rate, a battery stores that power for use during the on-peak window. Your home draws from the battery when rates are highest, then recharges from the grid or from panels during cheaper overnight or morning hours.

For households that have already shifted what they can, battery storage addresses the remaining on-peak gap. It does not reduce how much power a home uses; it changes when that usage draws from the grid versus the battery.

Whether a battery is worth adding depends on how large your remaining on-peak draw is and where the battery cost lands in the overall system price. Comparing quotes for systems with and without storage is the clearest way to run that analysis. Read more about battery storage and APS peak charges in Phoenix.

Financing a system today

The federal residential solar tax credit ended for homeowners who install with cash or a loan after 2025. A prepaid solar lease works differently.

The Phoenix Valley Solar prepaid lease is priced at 30 percent off because the leasing company owns the equipment and can claim the commercial 48E credit, passing the savings to you as a lower cost. This is not tax advice; consult a tax professional.

Option	How you pay	Federal credit available to homeowner
Cash purchase	Full price upfront	None
Solar loan	Little upfront, monthly payments	None
Prepaid lease	One discounted payment	Claimed by the leasing company

The practical next step

Check which utility is on your electric bill. APS and SRP both serve the Phoenix metro and the one you have depends on your address, not your city or ZIP code. Then use the solar calculator to get a rough system size for your usage.

When you are ready to compare prices, Phoenix Valley Solar puts competing installer bids side by side so you can see which proposals account for on-peak timing and which do not. You can get started through the contact page.

Frequently Asked Questions

How does solar affect my average APS bill in Phoenix?

Solar cuts daytime electricity use and earns a credit for surplus power you export. The bill stays significant if most household usage falls during weekday on-peak hours, when APS rates are highest and panels are winding down for the day.

What are APS on-peak hours for residential customers?

The standard APS residential time-of-use plan runs on-peak hours on weekdays in the late afternoon and early evening, year-round, not just in summer. Weekends are always off-peak. Check aps.com/plans for current rates, since APS updates them periodically.

Can a home battery eliminate my APS bill after going solar?

A battery stores surplus midday solar for use during on-peak hours, removing the sharpest peak-hour charges for many homes. It rarely eliminates the entire bill. Whether it pays for itself depends on how large your on-peak draw is and the total system cost.

Can I still get a discount on solar now that the federal credit is gone?

A prepaid solar lease is still priced at 30 percent below a purchase price because the leasing company claims the commercial 48E credit and passes the savings along. Cash and loan buyers no longer have access to a homeowner tax credit. This is not tax advice; consult a tax professional.