Phoenix averages 5.8 peak sun hours per day — more than any other major US city, more than Los Angeles, more than Miami, more than my own Austin rooftop at 4.9. By raw sunlight alone, Arizona should be the most solar-friendly state in the country.
The reality is more complicated. Arizona’s two dominant utilities have spent the better part of a decade restructuring their solar compensation policies in ways that made the economics significantly harder — particularly in one service territory where the math barely works at all for most homeowners. Understanding which utility serves your address is, without exaggeration, the single most important variable in an Arizona solar decision.
Here’s what the numbers actually look like, utility by utility.
The Solar Resource: Arizona’s Real Advantage
Start with the physics. A 9.6kW system in Austin — my system — produces approximately 14,300 kWh per year. The same system on a Phoenix rooftop would produce roughly 19,800–20,400 kWh per year, depending on roof angle and orientation. That’s 38–43% more electricity from identical equipment.
Higher production means more value per dollar of system cost and faster payback — in theory. The utility policies determine how much of that production actually translates into financial return.
According to SEIA’s Arizona solar market data, Arizona ranks consistently among the top five states for installed solar capacity. The resource is real and the industry is mature. But the utility question looms over all of it.
The Three Utilities You Need to Know
APS (Arizona Public Service) — ~70% of Residential Customers
APS serves most of the Phoenix metro, Flagstaff, Prescott, and large swaths of rural Arizona. If you’re in the Phoenix area and not in SRP territory, you’re likely an APS customer.
APS moved away from traditional net metering in 2017 and has progressively reduced export compensation since. Under the current structure, solar customers export excess production to the grid at the Resource Comparison Proxy (RCP) rate — currently approximately $0.076–$0.082 per kWh depending on rate plan. APS’s retail electricity rate for residential customers runs roughly $0.127–$0.145/kWh.
The math: every kWh you export to the grid is worth about $0.079. Every kWh you consume directly from your panels (or battery) is worth about $0.135 in avoided purchase cost. That’s a 41% penalty on exported power versus self-consumed power.
This is the same structural problem California created with NEM 3.0 — the policy shift that fundamentally changed the California solar calculus. Arizona simply got there a few years earlier. The response is also the same: prioritize self-consumption and add storage to capture excess production rather than exporting it at a discount.
APS payback estimate (2025):
- System size: 9.6kW
- Annual production: ~20,000 kWh (Phoenix)
- Typical household consumption: 12,000–14,000 kWh
- Self-consumed production: ~11,000–12,500 kWh (valued at $0.135/kWh)
- Exported production: ~7,500–9,000 kWh (valued at $0.079/kWh)
- Annual savings: approximately $2,300–$2,700
- Typical system cost after 30% ITC: $19,000–$22,000
- Estimated payback: 8–10 years
With a battery (which captures much of the would-be export for evening self-consumption), the payback tightens to roughly 9–11 years all-in for the system plus battery — but you’re starting from a higher net cost.
SRP (Salt River Project) — Scottsdale, Tempe, Mesa, Chandler, Gilbert
SRP is where Arizona solar gets genuinely difficult. It serves the southeast Phoenix metro — some of the most populated and affluent suburbs in the state — and has arguably the most solar-hostile rate structure of any major US utility.
In 2015, SRP introduced a demand charge for solar customers: a monthly fee based on your highest 30-minute electricity draw of the month, regardless of how much solar you produce. The demand charge can add $50–$150/month to a solar customer’s bill depending on usage patterns — and it’s nearly impossible to design around with normal household behavior.
The impact: a typical SRP solar customer can go solar, dramatically reduce their consumption from the grid, and still end up with a monthly bill higher than before — because the demand charge structures punish any grid draw at peak moments.
Marcus has worked with a handful of installers who do business in SRP territory. His candid assessment: “Installers who are being honest will tell you the SRP math doesn’t work for most customers without a significant battery and serious load management. The ones who don’t mention it aren’t doing you any favors.”
I’m not going to tell you solar is impossible in SRP territory. But it requires a fundamentally different system design — larger battery, home energy management system, careful appliance scheduling — and a realistic expectation that payback will be 12–15 years even with the excellent sun resource. For many homeowners, it genuinely isn’t worth it right now. If you’re in SRP territory, get a quote from at least one installer who specializes in SRP system design and ask them to model the demand charge explicitly in their production estimate.
TEP (Tucson Electric Power) — Tucson Metro
TEP is the bright spot in the Arizona utility landscape. Tucson Electric has maintained a more competitive net metering structure — export rates closer to retail value — and the Tucson market is generally considered more solar-friendly than Phoenix from a policy standpoint.
Tucson also gets slightly fewer sun hours than Phoenix (5.3–5.5 vs 5.7–6.0), but the better export economics more than compensate. TEP customers in Tucson generally see payback periods of 7–9 years — comparable to Texas, and better than most of the country — on well-designed owned systems.
If you’re in Tucson considering solar, the economics are favorable. The analysis is more similar to how I approached the Texas solar decision than the California or APS/SRP analysis.
Arizona’s Incentives: Simpler Than You’d Expect
Federal Investment Tax Credit (ITC): 30% of the gross system cost. Same as every other state — the anchor of any Arizona solar financial model.
Arizona State Sales Tax Exemption: Solar equipment is fully exempt from Arizona’s 5.6% state sales tax. On a $28,000 system, that’s $1,568 in immediate savings. Most installers apply this automatically; confirm it’s reflected in your quote.
Arizona Property Tax Exemption: Solar installations do not increase the assessed value of your home for property tax purposes under Arizona law. Meaningful given the home value premium discussed elsewhere — you get the value benefit without the tax increase.
No state income tax credit: Arizona previously offered a state income tax credit for solar (25% of costs, up to $1,000), but it was exhausted and has not been renewed as of 2025. Check the DSIRE database for current Arizona programs — state-level incentives do occasionally change, and local utility rebates vary.
No meaningful utility rebates: APS and SRP do not currently offer significant upfront rebate programs. TEP has offered periodic limited rebates; check directly with TEP if you’re in Tucson.
The Self-Consumption Imperative
Both APS and SRP customers arrive at the same conclusion from different directions: the financial case for solar in Arizona depends heavily on consuming as much of your own production as possible, rather than exporting it.
Practical strategies:
Time-of-use awareness: Run high-draw appliances (dishwasher, laundry, pool pump) during peak solar production hours — 10 AM to 3 PM. Direct solar consumption avoids both the export penalty and, in SRP territory, helps manage demand charge exposure.
Battery storage: Captures midday surplus for evening use rather than exporting it at the RCP rate. In APS territory, a battery converts would-be $0.079/kWh export power into $0.135/kWh self-consumption savings — a 71% improvement in value per kWh. In SRP territory, a battery also helps flatten demand peaks that drive the demand charge.
Smart thermostat pre-cooling: Arizona summers routinely hit 110°F+, and AC is the dominant electrical load for most households. Pre-cooling the house during peak solar hours (when electricity is effectively free) and letting it coast through the evening reduces both grid draw and demand peaks.
EV charging timing: Schedule EV charging during the peak solar window, not overnight. In Arizona’s high-sun environment, daytime EV charging from solar is more straightforward than in most states.
Who Should and Shouldn’t Go Solar in Arizona Right Now
Strong candidates:
- APS customers with above-average consumption (1,200+ kWh/month) — more self-consumption, better economics
- TEP customers — policy environment supports it
- APS customers adding a battery — converts export penalty into self-consumption value
- Homeowners with pool pumps, EVs, or other controllable high-draw loads they can shift to midday
Proceed with serious caution:
- SRP customers without a clear demand charge management plan and budget for battery storage
- APS customers with very low consumption — less production to self-consume, more goes to export at the discounted rate
- Anyone being quoted a solar-only system in SRP territory without an explicit demand charge analysis
The honest headline: Arizona’s sun resource is the best in the country and the federal ITC applies just like everywhere else. For APS and TEP customers with adequate consumption, solar makes sense in 2025 — but the payback math requires acknowledging the reduced export rate, which some installers still understate. For SRP customers, do the work carefully before signing anything.
— Allen
