Arizona Solar Savings Calculator

Calculate Arizona solar costs, 2026 federal tax-credit status, utility net billing export rates, property tax exemption, payback period, and 25-year savings.

Arizona 2026 rules: No active state solar income tax credit. The federal Section 25D credit ended for systems placed in service after December 31, 2025. APS, SRP, and TEP compensate exports under net billing at below-retail rates. Arizona exempts the added value of residential solar from property tax. Desert sun delivers top-tier production.

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Estimates only. Verify utility rates, net billing export terms, property tax exemption, and federal tax status with your utility, installer, and tax professional.

What Is the Arizona Solar Savings Calculator?

The Arizona Solar Savings Calculator is a financial estimation tool that calculates solar installation costs, potential electricity savings, payback time, and 25-year net savings. It uses your electricity bill, system size, installation cost, self-consumption percentage, export credit rate, and financial assumptions to estimate the long-term value of residential solar power.

Arizona solar savings depend partly on what happens to the electricity your panels generate. Electricity used directly in your home can reduce electricity purchases at your entered retail rate. Electricity sent to the grid receives the export credit rate you provide.

The calculator values these two portions separately. It also includes entered annual utility fees, property tax savings, incentives, and future rate increases when estimating financial results.

Its main outputs include gross system cost, net cost after entered incentives, annual solar production, estimated payback period, and 25-year net savings. These are projections based on a fixed calculation model, not guaranteed electricity bill reductions or investment returns.

How the Arizona Solar Savings Calculation Works

The calculator combines installation costs with estimated solar generation and electricity savings. It models 25 years of production, applies an annual reduction in solar output, and increases the entered electricity and export rates each year.

1. Calculate Gross Solar System Cost

Solar installation cost is calculated by converting system capacity from kilowatts (kW) to watts and multiplying by the entered installed cost per watt.

\text{Gross Cost}=\text{System Size (kW)}\times1000\times\text{Cost per Watt}

For example, an 8 kW system installed at $2.80 per watt has a gross cost of:

8\times1000\times2.80=\$22{,}400

The calculator then subtracts the entered federal credit, state credit, and upfront rebates. Each percentage-based credit is calculated separately against the original gross system cost.

\text{Net Cost}=\max\left(0,G-\frac{GF}{100}-\frac{GS}{100}-R\right)

Here, G is gross system cost, F is the federal credit percentage, S is the state credit percentage, and R is upfront rebates in dollars. The calculator does not allow the calculated net cost to fall below $0.

Both credit fields default to 0%, reflecting the calculator’s stated 2026 assumptions. These fields apply entered percentages mathematically and do not determine whether a homeowner qualifies for a tax benefit.

2. Estimate Annual Solar Energy Production

The calculator assumes that each kilowatt of installed solar capacity produces 1,750 kilowatt-hours (kWh) of electricity during the first year.

\text{Year 1 Production (kWh)}=\text{System Size (kW)}\times1750

An 8 kW solar system therefore has estimated first-year production of 14,000 kWh.

The model reduces solar production by 0.5% annually. For year y, the calculation is:

P_y=P_1\times(1-0.005)^{y-1}

P1 represents first-year electricity production, while Py represents production in year y. The calculator repeats this process across its 25-year projection.

It distributes annual generation into fixed monthly portions rather than assuming equal production every month. The assigned shares are January 1%, February 2%, March 4%, April 8%, May 15%, June 19%, July 19%, August 15%, September 8%, October 4%, November 2%, and December 3%.

3. Calculate Electricity Usage and Solar Savings

The calculator estimates your annual electricity consumption using your monthly electric bill and electricity rate.

\text{Annual Usage (kWh)}=\frac{\text{Monthly Bill}\times12}{\text{Electricity Rate per kWh}}

This assumes the entered electricity rate can be used to convert the entire monthly bill into energy consumption. Actual bills may also include fixed charges or other components. Enter a rate greater than zero to obtain a meaningful usage estimate.

For each month, self-used solar electricity is the smaller of the calculated self-consumption share of solar production and the estimated monthly household consumption. Remaining solar production is treated as exported electricity.

U_m=\min\left(P_m\times\frac{s}{100},\frac{A}{12}\right)

E_m=\max(0,P_m-U_m)

In these formulas, Um is monthly self-used solar electricity, Pm is monthly solar production, s is the entered self-consumption percentage, A is estimated annual household electricity use, and Em is exported solar electricity.

Self-used electricity is valued at the entered retail electricity rate. Exported electricity is valued at the entered export credit rate.

\text{Monthly Energy Value}=(U_m\times r)+(E_m\times e)

Here, r is the applicable retail electricity rate and e is the applicable export credit rate.

The calculator increases both rates annually by the selected annual utility rate increase percentage. It then adds the 12 monthly energy values, subtracts annual utility solar fees, and adds entered annual property tax savings.

S_y=\sum_{m=1}^{12}(U_{y,m}r_y+E_{y,m}e_y)-A_f+T

Sy is savings in year y, Af is annual utility solar fees, and T is annual property tax savings. The annual fees and property tax savings remain at their entered dollar amounts throughout the projection.

4. Calculate Payback Period and 25-Year Net Savings

The calculator adds annual savings until the cumulative amount equals or exceeds the net solar installation cost. The first year when this happens becomes the estimated payback year.

\text{25-Year Net Savings}=\sum_{y=1}^{25}S_y-\text{Net Cost}

If the net system cost is $0, the calculator displays an immediate payback. If cumulative savings do not reach net cost during the modeled 25 years, it displays a payback period of more than 25 years.

The calculation uses whole-year payback periods. It does not discount future savings to present value.

5. Worked Arizona Solar Savings Example

Consider the calculator’s default assumptions: a $130 monthly electric bill, $0.145 per kWh electricity rate, an 8 kW solar system, and a $2.80 installed cost per watt.

With a $0.080 per kWh export credit, 30% daytime self-consumption, 3.5% annual utility rate increase, $100 annual property tax savings, no annual solar fees, and no entered credits or rebates, the results are approximately:

Calculation	Estimated Result
Gross system cost	$22,400
Net system cost	$22,400
First-year solar production	14,000 kWh
Estimated annual household usage	10,759 kWh
Calculated first-year self-used energy	4,200 kWh
Calculated first-year exports	9,800 kWh
Calculated first-year savings, including property tax savings	$1,493
Payback period	13 years
25-year net savings	$30,771

In this example, first-year self-used electricity is valued at $609, while exported electricity is valued at $784. Adding $100 in property tax savings gives $1,493 for the first year. Over 25 years, the model projects approximately $53,171 in cumulative savings before subtracting the $22,400 net system cost.

These figures illustrate the implemented calculation. They are not predictions of what a particular Arizona home will achieve.

How to Use the Arizona Solar Savings Calculator

Enter your own electricity costs and solar system assumptions to estimate potential savings. You can keep the default values where they reasonably represent the scenario you want to explore.

Enter Monthly Electric Bill ($). Provide your monthly electricity bill amount. The default is $130.
Enter Electricity Rate ($/kWh). Use the per-kWh rate for your calculation. The default is $0.145.
Set System Size (kW) and Installed Cost per Watt ($). These determine your estimated upfront solar installation cost. The defaults are 8 kW and $2.80 per watt.
Review the utility and export assumptions. Choose APS, SRP, TEP, or UNS from the utility menu, and enter an Export Credit ($/kWh). The utility selection does not automatically change the numerical calculation, so enter your intended export rate directly.
Enter Daytime Self-Consumption (%). This represents the percentage of generated solar electricity initially assigned to direct household use, subject to the calculator’s monthly usage limit. The default is 30%.
Set Annual Utility Rate Increase (%) and Annual Utility Solar Fees ($). The defaults are 3.5% annual rate growth and $0 annual fees. The rate increase affects both retail and export rates in the model.
Review the optional battery checkbox. You can check Battery storage or high daytime self-use, but this checkbox does not currently modify the calculation. Adjust the self-consumption percentage yourself to model a different level of direct solar use.
Enter incentive assumptions. Review Direct Federal Credit (%), Arizona State Credit (%), Upfront Rebates ($), and Property Tax Savings ($/yr). The credit and rebate defaults are zero, while property tax savings default to $100 per year.
Click Calculate Savings. Review the cost breakdown, estimated payback, 25-year net savings, production figures, and other displayed results. Use Reset to restore the original inputs and clear the results.

Pay particular attention to the net system cost, payback period, and 25-year net savings. These figures help explain the modeled relationship between your upfront installation expense and future electricity-related savings.

What Your Arizona Solar Savings Results Mean

Gross System Cost and Net Cost

Gross System Cost is the estimated installation price before incentives. Net Cost is the remaining calculated expense after the entered federal credit, state credit, and upfront rebates have been subtracted.

The calculator applies whatever eligible-looking percentages you enter without checking tax eligibility, program availability, or rebate approval. Verify any incentive before treating it as an actual cost reduction.

Payback Period

Payback Period identifies the first modeled year when accumulated savings recover your net system cost. The accompanying progress bar expresses that year as a percentage of the calculator’s 25-year modeling period.

A 13-year payback, for example, means the model first reaches the net installation cost during year 13. It does not mean the same amount of savings will occur every year.

25-Year Net Savings

25-Year Net Savings is the estimated total of annual savings over 25 years minus net system cost. The figure can be positive or negative. A positive result means modeled cumulative savings exceed the installation expense; a negative result means they do not.

The model does not separately calculate financing costs, loan interest, maintenance expenses, equipment replacements, or the present value of future cash flows. These can affect actual financial outcomes.

Solar Offset and Annual Usage

Annual Usage is estimated from the monthly bill divided by the entered electricity rate, multiplied by 12.

Solar Offset compares first-year solar production with that estimated annual household electricity consumption.

\text{Solar Offset (\%)}=\frac{\text{Year 1 Solar Production}}{\text{Estimated Annual Usage}}\times100

Because this is a production-to-consumption ratio, the result can exceed 100%. It does not mean your electricity bill will be eliminated or that all generated energy will be used inside the home.

25-Year CO2 Offset

The calculator also estimates a 25-Year CO2 Offset. It adds solar electricity production across all 25 years and applies a fixed factor of 0.45 tons per 1,000 kWh.

\text{CO2 Offset (tons)}=\frac{\text{25-Year Production (kWh)}}{1000}\times0.45

This is a simplified environmental estimate. It is not a location-specific measurement of avoided power plant emissions.

Important Display and Model Limitations

There are three important details in the current calculator implementation. First, the displayed rows labeled Year 1 Self-Use kWh and Year 1 Export kWh actually use the final modeled year’s values, not the first year’s values. Second, the row labeled Net Year 1 Savings displays the positive 25-year net savings amount, or $0 if that amount is not positive. It should not be interpreted as an actual first-year savings figure.

Third, choosing a utility or checking the battery option does not change the calculation. Export rates and self-consumption must be entered directly. The federal-credit, net-billing, and property-tax status badges are informational labels rather than individually verified eligibility results.

The calculator uses fixed production and degradation assumptions. Real solar output varies with sunlight, roof orientation, shading, weather, equipment performance, and other site-specific conditions. Actual utility billing also depends on applicable tariffs and charges.

Frequently Asked Questions

How much can solar panels save in Arizona?

Potential savings depend on installation cost, electricity prices, solar production, self-consumption, export credits, and entered financial assumptions. The Arizona Solar Savings Calculator combines these values to estimate 25-year net savings. Entering your own electricity rate and installation quote produces a more relevant scenario than relying only on the default values.

How long does it take for solar panels to pay for themselves in Arizona?

Solar payback occurs when cumulative modeled savings equal or exceed the net installation cost. This calculator reports the first break-even year within a 25-year period. If that point is not reached, it displays 25+ Years. Actual payback may differ because energy production, utility prices, and ownership expenses can change.

Why does daytime self-consumption affect solar savings?

Daytime self-consumption affects how solar electricity is valued. Energy used directly in your home offsets electricity at the entered retail rate, while exported energy receives the entered export credit rate. If the retail rate is higher than the export credit, increasing self-consumption can increase modeled savings, subject to the calculator’s monthly household usage limit.

Does this calculator include Arizona solar tax incentives?

Yes. The calculator includes editable fields for federal and Arizona state credit percentages, upfront rebates, and annual property tax savings. Both percentage-based credits and rebates reduce the calculated net installation cost. Annual property tax savings increase modeled yearly savings. The calculator does not independently determine whether you qualify for any incentive.

Does choosing APS, SRP, TEP, or UNS change the calculation?

No. Although the calculator provides a utility selector, its current mathematical calculation does not use the selected utility to change electricity rates, export credits, fees, or other assumptions. You must enter the applicable electricity rate, export credit rate, and annual solar fees manually for the scenario you want to estimate.

Does the calculator include solar panel degradation?

Yes. The calculator reduces modeled solar electricity production by 0.5% each year across its 25-year projection. The reduction is compounded annually, meaning each year’s production is calculated from the previous year’s reduced output. This is a fixed model assumption, not a measurement of the performance of a particular solar panel system.

Can the calculator show negative solar savings?

Yes. The 25-Year Net Savings result can be negative when cumulative modeled savings do not exceed net system cost. The calculator also displays a negative-return message in that case. A negative result means the system does not recover its modeled upfront cost within the assumptions and period used, not that it will necessarily perform that way in practice.

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