Solar Topps, SunValley Solar, Momentum Solar and Palmetto are the four installers in our vetted Arizona network for 2026. In Arizona the rate plan is the product: APS, TEP and SRP are three different regimes, and the right company is the one fluent in yours before it sizes your roof.
Arizona utility rate structures, regulatory jurisdiction notes, and federal credit status reviewed August 2026.
Arizona has more solar companies per capita than almost any state, and that abundance hides the actual problem: finding a competent crew here is easy, and finding a company that designs around the right utility rate plan is not. The second one is worth far more money.
In most states the installer sells hardware and the utility bill takes care of itself. In Arizona the rate plan you land on is the product, and the hardware is the delivery mechanism. A company that cannot name your plan has not started the job.
The Arizona Rate-Plan Fit Test
Arizona’s three major utilities are separate regimes, not variations on a theme, and one of them sits outside the Corporation Commission’s rate jurisdiction entirely. The design consequence differs in each.
Utility | Who sets its solar terms | What the system design has to optimize for |
|---|---|---|
Arizona Public Service | Arizona Corporation Commission | Time-of-use pricing, so production timing matters more than annual total |
Tucson Electric Power | Arizona Corporation Commission | Time-of-use pricing under separate tariffs from APS, modeled on its own terms |
Salt River Project | Its own elected board, outside Commission rate jurisdiction | Demand-based components, which penalize short usage spikes rather than total consumption |
Designing for a demand charge is a different exercise from designing for an energy charge. A company that treats all three the same will get at least one of them wrong, and the homeowner absorbs it.
Ask directly: which utility serves me, which specific rate plan are you modeling, and have you built systems on that plan before? Then ask what happens to your bill if the utility changes the plan, because these have changed before. Program and rate detail is in Arizona solar incentives.
Four Arizona Companies, Ordered by Rate-Plan Fluency
Ordered by depth of Arizona rate-plan and utility-specific design experience. Ranking is not influenced by any commercial relationship, and no company pays for placement or position.
Solar Topps
An Arizona company focused on solar paired with home battery storage, which is the design combination that time-of-use pricing and below-retail export credits actually reward here.
SunValley Solar
Arizona-based with a long presence in the state’s residential market and the utility-specific experience that comes with it.
Momentum Solar
A large multi-state residential installer active in Arizona among roughly ten states.
Palmetto
Operating in Arizona among fifteen states, founded 2011, with 25-year panel and inverter warranties and 10-year workmanship coverage.
Arizona Solar Companies Compared
The same four companies side by side, on the points that actually separate them in Arizona.
Company | Rate-Plan Fluency To Test | Storage Practice | Service Area |
|---|---|---|---|
Solar Topps | APS / SRP / TEP, ask for plan-specific installs | Core of the practice | Arizona |
SunValley Solar | Long AZ record, ask by plan | Ask | Arizona |
Momentum Solar | Ask for AZ plan-specific installs | Ask | Multi-state |
Palmetto | Ask for AZ plan-specific installs | Ask | National |
Two Arizona-based companies and two multi-state operators is a reasonable spread. Arizona’s market is dense enough that collecting a fourth quote genuinely moves the price, which is not true in a thin market like New Hampshire.
The Flat-Rate Savings Model
Arizona’s characteristic bad proposal is arithmetically simple and completely wrong.
It multiplies annual production by a single cents-per-kilowatt-hour figure and presents the result as your savings. In a time-of-use state where exported power earns an export credit rather than retail value, that calculation misprices almost every kilowatt-hour in it. Power you consume as you generate it is worth retail. Power you export is worth less. A model that values both identically overstates the outcome, and the overstatement is largest in exactly the summer months that dominate the annual figure.
Three related things a competent Arizona proposal will contain and a lazy one will not:
- Production shaped by hour and season, not just an annual kilowatt-hour total. Arizona’s value concentrates in summer afternoons, and an annual number hides whether the array produces then.
- Heat derate in the production estimate. Panel output falls as cell temperature rises, and Phoenix summers are the extreme case. Ignoring it is optimistic in the season that matters most.
- The battery priced as its own line with its own case. Storage is genuinely valuable under time-of-use and demand structures, which is exactly why it should be justified separately rather than bundled into one monthly payment.
Then compare cash price beside financed price. Arizona’s competitive market produces aggressive financing, and dealer fees ride inside the principal.
Benchmark against what solar costs in Arizona, settle the purchase question with whether solar is worth it in Arizona, and for no-upfront-cost offers read how zero-down solar works in Arizona first.
What a Demand Charge Does to an SRP System Design
If Salt River Project serves you, this section is the one that matters, and most Arizona solar content skips it entirely.
An energy charge bills you for how much electricity you use. A demand charge bills you for your highest short burst of usage in the billing period. They reward completely different behavior. Under an energy charge, cutting total consumption saves money. Under a demand charge, one hot afternoon where the air conditioning, the oven, and the dryer all run together can set a charge that solar production does not necessarily offset, because the peak may land outside strong production hours or exceed what the array can cover in that moment.
The consequence is specific: on a demand-based plan, a bigger array does not reliably reduce your demand charge. Controlling the peak does. That is a storage-and-controls problem, not a panel-count problem, and it is the single most common way an SRP proposal disappoints a homeowner who did everything else right.
Three questions for any company quoting an SRP home:
- What is my current demand charge, and what does your model expect it to be after installation? Two numbers. If the proposal cannot produce them, it modeled an energy charge.
- How does the system reduce the peak specifically, rather than total consumption?
- How many SRP customers have you installed for, and what did their demand charges actually do?
A company that works SRP regularly will answer without hesitation. A company that treats SRP as a variation on APS will answer about annual kilowatt-hours, which is the wrong quantity.
Model My Rate Plan Before I Compare Quotes
In Arizona the rate plan decides the design, and the design decides the return. Enter your ZIP code to identify your utility and see what a correctly modeled proposal has to account for before you compare prices.
How We Rank Solar Companies
Rankings are built from what we can verify, never from who pays us. Five weighted factors:
Frequently Asked Questions
Not in the traditional retail form. Arizona utilities compensate exported solar through an export credit rather than at the full retail rate, and residential solar customers are generally placed on time-of-use plans. Ask which rate plan and export rate the savings model used.
There is no single answer, because the right company depends on your utility. The four in our network are Solar Topps, SunValley Solar, Momentum Solar and Palmetto, ordered by depth of Arizona rate-plan experience. When comparing solar companies in AZ, weight rate-plan fluency heavily: an installer who models the wrong plan produces a savings figure that never arrives.
They are separate regimes with different rate designs, and SRP is governed by its own elected board rather than the Arizona Corporation Commission. SRP structures for solar customers have historically included demand-based components, which require a different system design than energy-only charges.
More often than in most states. Time-of-use pricing and export credits below retail both improve the case for storing production and using it during expensive hours. It should still be priced as its own line item with its own justification.
Fix the system size and equipment tier, then compare cash prices. Require each company to name the rate plan it modeled, state the export credit separately from retail value, and show a production estimate accounting for heat derate. Those assumptions explain more of the gap between quotes than the hardware does.
Not for a purchased system. The federal residential credit ended for installations completed after December 31, 2025. A lease or PPA provider may access a business-side credit, but the homeowner does not claim it.
Sources
References & Research Sources
EcoGen America reviewed Arizona Corporation Commission rate materials, Arizona Public Service, Tucson Electric Power and Salt River Project residential solar resources, installer service-area disclosures published by the companies themselves, and federal tax guidance for this article. Sources were accessed August 4, 2026, unless another publication, release, effective, or update date is listed below.
- Arizona Corporation Commission (ACC). Utilities Division Rate Resources. State regulatory resource covering residential rate structures for regulated utilities. Accessed August 4, 2026.
- Arizona Public Service (APS). Residential Solar and Rate Plans. Utility resource covering solar customer rate plan options and export compensation. Accessed August 4, 2026.
- Salt River Project (SRP). Solar Price Plans. Utility resource covering price plans for customers with on-site generation, including demand components. Accessed August 4, 2026.
- Tucson Electric Power (TEP). Residential Solar Resources. Utility resource covering solar customer rate treatment and export compensation. Accessed August 4, 2026.
- Solar Topps. Company Service Area and Storage Resources. Installer-published Arizona coverage information. Accessed August 4, 2026.
- SunValley Solar. Company Service Area Resources. Installer-published Arizona coverage information. Accessed August 4, 2026.
- Momentum Solar. Company Service Area Resources. Installer-published multi-state coverage information. Accessed August 4, 2026.
- Palmetto. Locations and Solar Protection Terms. Installer-published multi-state coverage and warranty information. Accessed August 4, 2026.
- Internal Revenue Service (IRS). FAQs for Modification of Sections 25C, 25D, 25E, 30C, 30D, 45L, 45W and 179D under Public Law 119-21. Federal guidance confirming termination of the residential clean energy credit for installations completed after December 31, 2025. Accessed August 4, 2026.
