Is solar worth it in Arizona?

Arizona gets excellent sunshine — about 6.5 peak sun hours a day — and residential electricity runs around $0.15/kWh. For a typical $150-a-month power bill, that points to roughly a 6.3-kW system costing about $18,967 — with no federal tax credit, which ended for installations completed after December 31, 2025 — paying for itself in about 10.5 years and netting on the order of $42,397 over 25 years. Your own numbers will differ — the calculator above uses your real bill.

Arizona has some of the best sunshine in the country, so systems produce a lot — but electricity is relatively cheap, which lengthens payback a little. Net-billing (not full retail net metering) means exports are credited below retail, so self-consumption matters.

What changes the math in Arizona

• Your electricity rate — the more you pay per kWh, the more each solar kWh saves you. Arizona sits at about $0.15.
• Sun hours — more sun means a smaller, cheaper system covers the same usage. Arizona averages ~6.5 hours.
• Net metering / buyback — how your utility credits power you export swings the payback; check your specific utility's current terms.
• Install cost — quotes vary by installer and roof; the calculator defaults to a typical $/watt you can override.

Arizona: the rules that actually decide your payback

Who your utility is, and why it matters

Arizona Public Service and Tucson Electric Power are regulated by the Arizona Corporation Commission. Salt River Project is not — it is a political subdivision governed by its own elected board, and it sets its own price plans for solar customers independently of anything the ACC decides. Establishing which of the three serves you is genuinely the first step here, because the SRP approach and the ACC approach differ in structure, not just in rate.

What your exported power is worth

Arizona replaced retail net metering with net billing. Exported power is bought at an export price the Commission sets through a Resource Comparison Proxy methodology, well below the retail rate, and that price steps down over time as the methodology is re-run. The important protection is that the export price applying when you interconnect is locked for a period of years, so the rate you sign up under is not immediately eroded. SRP customers instead move onto price plans that have historically included a demand charge — billing partly on your single highest period of draw rather than on total energy — which rewards spreading load and punishes short sharp peaks.

The Arizona incentive layer

Arizona offers a residential solar energy credit against state income tax worth 25% of system cost, capped at $1,000. It is modest against a five-figure system but it is a real reduction and it survives the federal credit's expiry untouched. Solar equipment is also exempt from state sales tax, and the added value is excluded from property-tax assessment.

Battery and self-consumption

With exports credited below retail and demand charges in play for some customers, using your own generation as you make it is worth more here than selling it. Arizona's load peaks late on summer afternoons and holds into the evening, which is exactly when an array is fading — the textbook case for shifting stored energy into the evening. Heat is the counterweight to remember: module output falls as cell temperature rises, so Arizona's excellent irradiance does not translate into proportionally excellent production, and a credible production estimate will have accounted for that.

What to check on a Arizona quote

• Establish whether you are an APS, TEP or SRP customer before anything else — SRP's rules are not the ACC's.
• Ask what export price was assumed, and for how many years it locks at your interconnection date.
• If you would be on a demand-charge plan, ask to see savings modelled on that plan specifically, not on a flat rate.
• Confirm the $1,000 state tax credit is reflected, and that you have the tax liability to use it.
• Ask what temperature derate the production estimate used — an estimate that ignores Arizona heat overstates output.

Programme and tariff detail above is summarised from Arizona Corporation Commission — net billing and the Resource Comparison Proxy export rate. Last reviewed 20 August 2026 by SolarDime editorial. These rules change — confirm the current terms with your utility and the regulator before you sign.