In 2026, the average cost of a 13.52-kilowatt residential solar system in Arizona is about $30,745 before incentives. That works out to roughly $2.27 per watt installed, with marketplace prices generally ranging from $26,133 to $35,357.
For a 2026 installation, the estimated cost after Arizona's state tax credit is about $29,745, assuming you qualify for and can use the full $1,000 credit. The federal 30% Residential Clean Energy Credit does not apply to eligible expenditures made after December 31, 2025.
Arizona Solar Cost at a Glance
| Cost factor | Typical amount |
|---|---|
| Average system size | 13.52 kW |
| Average installed price | $30,745 |
| Average price per watt | $2.27 |
| Typical price range | $26,133 to $35,357 |
| Arizona state tax credit | Up to $1,000 |
| Estimated cost after state credit | About $29,745 |
| Federal residential solar credit for new 2026 installations | Not available |
These figures come from recent Arizona marketplace data. They are not a guaranteed price for every home. Your quote will depend on electricity use, roof conditions, equipment, financing and utility requirements.
How Much Does Solar Cost by System Size in Arizona?
At Arizona's average installed price of $2.27 per watt, approximate system prices are:
| Solar system size | Approximate installed price before incentives |
|---|---|
| 5 kW | $11,350 |
| 8 kW | $18,160 |
| 10 kW | $22,700 |
| 13.52 kW | About $30,745 |
| 15 kW | $34,050 |
A 5 kW system may suit a smaller home with moderate electricity use. Many larger Arizona homes need 10 kW or more because of air-conditioning demand, swimming pools, electric vehicles and other high-load appliances.
What Incentives Reduce the Cost of Solar in Arizona?
Arizona's state tax credit and sales-tax exemption can lower the project cost. The federal 30% residential credit does not apply to qualifying expenditures made after December 31, 2025.
Arizona Solar Tax Credit
Arizona offers a nonrefundable state tax credit equal to 25% of the cost of a qualifying solar energy device, up to $1,000. If the credit exceeds your Arizona income tax liability, you can generally carry the unused amount forward for up to five years.
Estimated costs after the maximum state credit would be:
- $11,350 system: about $10,350
- $22,700 system: about $21,700
- $30,745 system: about $29,745
Because the credit is nonrefundable, you need enough Arizona income tax liability to use it. A tax professional can confirm whether you qualify.
Federal Solar Tax Credit
The federal Residential Clean Energy Credit previously reduced qualifying solar costs by 30%. Under the 2025 federal law changes, the credit is not available for residential clean energy expenditures made after December 31, 2025.
A system installed and completed in 2026 should not be priced on the assumption that the federal credit is available.
Arizona Sales Tax Exemption
Arizona exempts qualifying solar energy devices from state transaction privilege tax. The exemption can also apply to contractor installation services. Ask the installer to show how the exemption appears in the contract or invoice.
Why Do Solar Quotes Vary Between Arizona Homes?
Quotes vary because the system size and installation work are different from one home to the next. Common cost factors include:
- System size: Higher electricity use requires more panels and equipment.
- Roof design: Multiple roof surfaces, steep pitches and complex layouts can increase labor.
- Electrical upgrades: Some homes need a main-panel upgrade or other electrical work.
- Battery storage: A battery adds equipment and installation costs.
- Shading: Trees, nearby buildings and roof obstructions can reduce production or require more panels.
- Equipment selection: Panels, inverters, racking and monitoring systems vary by brand and warranty.
- Permitting and interconnection: Local rules and utility approval affect the project.
- Financing: Loan fees and interest can raise the total amount paid over time.
A low monthly payment does not necessarily mean a low project cost. Compare the cash price, total financed cost, loan term, interest rate and dealer fees.
How Do APS and SRP Affect Solar Savings?
Your utility provider affects how much your system saves because each utility handles exported solar power differently.
Arizona Public Service, or APS, uses net-billing arrangements for many new residential solar customers. Under the Resource Comparison Proxy export rider, APS credits excess electricity sent to the grid at an approved export rate. It does not automatically credit every exported kilowatt-hour at the full retail rate.
Salt River Project, or SRP, offers several solar price plans. Some plans provide net-metering-style treatment, while export plans compensate excess generation under a separate export rate. SRP says the plan you choose determines how exported electricity is credited and whether excess generation carries over.
Because of these rules, using your solar power during the day can affect the financial result. You may also shift some electricity use to daylight hours or add a battery, depending on your utility plan and household usage.
What Should You Look for in an Arizona Solar Quote?
Compare at least three proposals. Each one should show:
- Cash price before incentives
- Price per watt
- Estimated annual electricity production
- Expected percentage of your electricity use covered
- Panel and inverter warranties
- Installer workmanship warranty
- Loan interest rate and total repayment
- Whether the contract includes a battery
- Roof repairs or electrical upgrades
- Who handles permits and utility interconnection
A quote is easier to compare when it separates the solar system, battery, roof work, electrical work and financing costs.
Bottom Line
Use the installed price, utility plan and financing terms together when comparing Arizona solar proposals. The system price alone does not show how much electricity you will use directly, how much excess power will earn under your utility's export rules or how much the loan will add over time.
Before signing, confirm the cash price, expected production, state tax credit, utility compensation plan and total repayment amount.