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Is Solar Worth It in Casas Adobes, Arizona?

We analyzed Tucson Electric Power (TEP) rate books, NREL irradiance data, and Arizona tax codes to calculate the real ROI for homeowners in 85704.

Market Snapshot

Elec. Rate
$0.135/kWh
Sun Hours
6.52
Utility Tucson Electric Power (TEP)
Tax Exempt Yes
Battery Required

Analyst Note: The "4kW Benchmark"

The analysis below uses a standardized 4kW system to provide a fair baseline comparison across cities. However, the average electric bill in Casas Adobes is $155.25.

⚠️ Most homes here will need a larger system (8kW–12kW) to reach 100% offset. Use the calculator below for your exact numbers.

With the Sonoran sun shining nearly 300 days a year, homes in Casas Adobes have a massive untapped energy resource on their roofs. Converting that sunlight into electricity is the most effective way to fight back against rising Tucson Electric Power (TEP) bills. In 2026, the key isn't just generating power, but also storing it to achieve true energy savings.

Benchmark Cost Analysis

Solar Panel & Battery Cost in Casas Adobes (2026)

For most homeowners in the Casas Adobes area, a complete solar and battery storage system is the standard for maximizing savings. Here’s a typical price breakdown after factoring in all available incentives:

  • Gross System Price (Panels + Battery): ~$23,500
  • Federal & State Tax Credits: -$8,050
  • Your Final Net Cost: $15,450

You may see advertisements for cheaper, solar-only systems (around $7,000 net), but they are poorly suited for TEP's current rate structure. Without a battery, you'll be forced to sell your valuable excess solar energy back to TEP for a fraction of its worth.

Incentives & Tax Credits

Tax Credits Make Solar Affordable

The total upfront cost of solar is made much more manageable by powerful government incentives available in 2026:

  • 30% Federal ITC: The most significant incentive, this allows you to claim 30% of your total system cost as a dollar-for-dollar credit on your federal taxes. On a $23,500 system, this is a $7,050 reduction.
  • $1,000 Arizona State Credit: Arizona provides its own $1,000 tax credit to further encourage solar adoption.
  • Tax Exemptions: Your solar investment is 100% exempt from sales tax and will not trigger an increase in your Pima County property taxes.

Net Metering: Tucson Electric Power (TEP)

Policy Status

Net Billing (2024)

Battery Priority

Critical 🔋

TEP's Net Billing Policy Explained

The reason a battery is non-negotiable in Casas Adobes is TEP's Net Billing tariff. Under this policy, any excess solar power your panels generate is sold to the grid for a low wholesale rate (around 7-8¢ per kWh). But when you need to buy power from TEP in the evening, you pay the full retail rate of 13.5¢ or more. A battery breaks this cycle. It stores your excess solar power so you can use it yourself instead of selling it cheap and buying it back expensive.

Projected Savings

Your Expected Savings on TEP Bills

Installing a solar and battery system allows you to power your home day and night with clean energy from your roof. This translates to an estimated $900 in electricity bill savings in the first year alone. That's money that stays in your pocket instead of going to TEP. These savings will compound over the 25+ year lifespan of the system, especially as utility rates inevitably increase.

Local Questions Answered

Do I need a battery with TEP's rate plans?
Yes. To get significant savings with TEP, a battery is essential. It lets you avoid their low export credits and use your own solar power during peak evening hours when electricity is most expensive, a strategy known as 'self-consumption'.
How does the Arizona sunshine impact panel choice?
The high solar irradiance in Casas Adobes is fantastic for production. We recommend high-efficiency panels with a good temperature coefficient, as they perform better in the summer heat. Our calculator automatically suggests panels suited for the local climate.
What happens during a power outage with a solar and battery system?
A key benefit of a battery is blackout protection. When the TEP grid goes down, your system can automatically disconnect and use the stored energy in your battery to power essential appliances like your refrigerator, lights, and medical devices.

Calculate Your Solar Savings

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Initializing Solar Engine...

* Calculations based on Tucson Electric Power (TEP) residential rates (0.135/kWh).

Data Transparency & Methodology

Estimates for Casas Adobes, Arizona are produced by the SunCents Solar Engine (v1.2). We combine the following verified or standard industry sources:

Performance (PV production)

NREL PVWatts — modeled annual and hourly AC output (kWh), solar radiation, and system losses for a standardized array size so cities can be compared fairly.

nrel.gov

Electricity rates (tariffs)

U.S. Energy Information Administration (EIA) — state-level average retail electricity prices ($/kWh) and supporting series for economic context.

eia.gov

Incentives & programs

DSIRE — state and local rebates, net metering, and policy programs (summarized for readability; always confirm eligibility with a tax or solar professional).

dsireusa.org

Federal tax credit (ITC)

Investment Tax Credit — federal residential solar credit (e.g. 30% of qualified costs where applicable); rules change with statute—verify with a qualified advisor.

energy.gov

Utilities & interconnection

Where shown, local utilities (e.g. APS, PG&E, FPL, and other IOUs or munis) are mapped from public interconnection, tariff, or service-territory references so net metering and rider rules match your area—not generic national averages.