Solar in Arizona

Arizona's residential solar policy is defined by the 2017 move to net billing. The Arizona Corporation Commission eliminated full-retail net metering for the state's investor-owned utilities — Arizona Public Service (APS), Tucson Electric Power (TEP), and UniSource Energy Services (UNSE) — replacing it with reduced export credits set to each utility's avoided cost. Current export rates run roughly 5–7 cents per kilowatt-hour (APS about $0.0617/kWh, TEP about $0.0513/kWh, and UNSE about $0.0612/kWh through September 1, 2026), a small fraction of the retail rate customers pay for power. Salt River Project (SRP), a large municipal provider outside Corporation Commission jurisdiction, operates its own separate net-billing plan with its own export rate.

The Arizona Residential Solar Energy Tax Credit is the standout state incentive and the only remaining state-level solar income tax credit in the Sun Belt. Worth 25% of system cost up to $1,000, it is claimable against personal income tax and is one reason Arizona's economics remain workable despite the net-billing export rates. Solar energy devices are also exempt from property tax on their added value under ARS 42-11054.

The strategic implication of net billing is the same as in California's NEM 3.0: the value proposition shifts from exporting surplus to self-consuming it. Storage and load-shifting — running air conditioning, EV charging, or appliances during peak generation — are what capture the full retail value of each kilowatt-hour. Arizona offers no dedicated battery rebate comparable to California's SGIP, so storage here is justified on self-consumption and resilience logic rather than an upfront incentive.

Arizona's 5.2 peak sun hours are among the highest in the United States, trailing only a handful of desert and high-altitude states. The Phoenix metro and the low desert routinely exceed 5.5, while Tucson and the southern basin land near the state average; the higher-elevation Flagstaff and Prescott areas run slightly lower in raw hours but benefit from cooler panel temperatures that can partly offset the difference. Annual production is remarkably consistent, with minimal seasonal swing compared to northern states — Arizona's winter output stays productive where a Michigan or New York array drops to a fraction of its summer peak.

A south-facing 8 kW array tilted near latitude (roughly 33°) typically produces on the order of 11,000–12,000 kWh per year. But because net billing compensates exports at only a few cents per kilowatt-hour, raw output maximization is no longer the right objective. The value-maximizing design in Arizona pushes production toward the afternoon and early-evening hours when air-conditioning load peaks — a west-facing or southwest orientation can capture more of that expensive peak demand, even at the cost of slightly lower total generation.

Arizona's summer heat also affects panel performance. Photovoltaic output degrades as cell temperature rises, so a 110°F Phoenix afternoon produces less than the raw irradiance would suggest. Adequate roof-to-panel airflow and, where possible, a slight rack gap help preserve output during the months that matter most.

At $2.70/W, Arizona is one of the least expensive states for installed solar — below the national average and well below high-cost markets like California and New York. A typical 8 kW system runs about $21,600 before incentives. The state layers the Arizona Residential Solar Energy Tax Credit (25% of cost, up to $1,000) on top of a property tax exemption for the added value of solar devices (ARS 42-11054), meaning the improvement does not raise the property tax bill. There is no state sales tax exemption for solar equipment in Arizona.

The 30% federal residential credit (Section 25D) ended December 31, 2025, so owned systems placed in service in 2026 no longer receive it — a meaningful change that pushes payback out relative to a year ago. Leased and PPA arrangements can still capture the Section 48E Investment Tax Credit for projects that began construction before July 6, 2026, with the developer passing savings through as lower payments.

Payback lands near 10 years on the 8 kW model without the federal credit, driven by the combination of low installed cost, abundant sun, and the $1,000 state credit. That timeline is sensitive to how much generation is self-consumed versus exported: a household that uses most of its midday production pays back faster than one that exports a large surplus at the reduced net-billing rate.