Solar panels in Tucson, AZ: cost, incentives, and quotes

Tucson has some of the strongest solar resources in the United States: 350+ sunny days per year, 5.5\u20136.5 peak sun hours daily, and an extreme dry climate that keeps panels operating efficiently. The economics under Tucson Electric Power are nonetheless meaningfully different from the older "30% federal credit plus full net metering" picture that most solar content references. TEP phased out 1:1 net metering in 2018 and replaced it with the Resource Comparison Proxy (RCP) export rate. The federal residential tax credit ended December 31, 2025. The right system design for Tucson in 2026 looks different than the system that would have made sense in 2020.

Why solar still makes sense in Tucson

The physics case for Tucson solar is excellent. The Sonoran Desert offers some of the best year-round solar resource in the country, with low humidity, minimal cloud cover, and high direct-normal irradiance. A 7 kW residential system in Tucson typically produces 11,000\u201312,500 kWh per year, comparable to Phoenix and substantially better than most US markets.

TEP residential rates average around 15 cents per kilowatt-hour, modestly below the US average. The combination of strong production and moderate rates produces meaningful per-kWh savings, but the RCP export structure means how you use the electricity matters more than how much you produce. Maximizing self-consumption (using solar power when you generate it rather than exporting it) is the central design principle for Tucson solar economics in 2026.

The Resource Comparison Proxy: what changed in 2018

Until 2018, TEP offered 1:1 retail-rate net metering: exported solar earned credits at the same rate the homeowner paid for grid electricity. In October 2018, the Arizona Corporation Commission voted to phase out net metering across investor-owned utilities in the state, replacing it with the RCP export rate.

Under the RCP framework, exported solar earns a credit based on the average market cost of utility-scale solar energy over a recent five-year period. The 2024\u20132025 RCP rate is $0.0570 per kWh; the rate effective from October 2025 is approximately $0.0633 per kWh. Both are roughly 38\u201342% of TEP\u2019s retail rate.

Two structural features of the RCP shape Tucson solar design:

• 10-year rate lock. New solar customers lock in the RCP rate in effect at their interconnection date for 10 years. After 10 years, the system resets to the then-current RCP rate, which is expected to be lower.
• Same-billing-cycle credits only. Unlike traditional net metering, RCP credits don\u2019t carry over month to month. Excess production that isn\u2019t consumed or used to offset usage in the same billing cycle is paid out as a small financial credit but cannot be banked for later use.
• Maximum 10% annual decrease cap. The ACC limits annual RCP rate decreases to 10%, which provides some predictability but also signals continued downward pressure on the rate over time.

The pre-2018 net metering customers were grandfathered: their original 1:1 retail-rate structure continues for 20 years from their interconnection date. New 2026 customers are subject to RCP.

Designing for self-consumption (and why batteries matter)

Because the RCP export rate (~6.3 cents) is meaningfully lower than the retail rate you pay for grid electricity (~15 cents), every kWh you self-consume is worth more than every kWh you export. The design implication: size and configure your solar system to maximize self-consumption rather than to maximize annual production.

For most Tucson homes, this means:

• Right-size the solar array to match your annual usage closely rather than substantially exceeding it (oversizing produces more exports at the lower RCP rate, with diminishing returns).
• Shift discretionary electricity use to daylight hours when possible (running dishwasher, laundry, pool pump, EV charging in the afternoon).
• Strongly consider battery storage to store midday production for evening use.

Battery economics in Tucson under TEP\u2019s RCP structure are similar in shape to California NEM 3.0 economics: the difference between the retail rate you avoid paying (15 cents) and the RCP rate you would earn (6.3 cents) is about 9 cents per kWh. A battery that lets you self-consume one kWh of solar production instead of exporting it captures that 9-cent spread, which is the source of the battery\u2019s economic value beyond pure backup.

Solar plus a battery typically produces 9\u201312 year payback in Tucson. Solar alone is workable but typically extends payback to 12+ years, especially after the loss of the federal residential tax credit.

TEP requires time-of-use rates for solar customers

TEP requires all new residential solar customers to take service on a time-of-use rate plan rather than the simple flat rate available to non-solar customers. TOU rates have on-peak and off-peak periods with different per-kWh charges. The on-peak window in Tucson is typically afternoon and early evening (4\u20139 pm), when grid demand is highest.

This TOU requirement affects solar customers in two ways. First, it means solar production during the day partially offsets on-peak grid rates if you\u2019re using power at home; that\u2019s a benefit. Second, it means electricity drawn from the grid during the evening peak (after solar production has dropped) costs more than it would on a flat rate; that\u2019s a cost. The net effect is favorable for solar customers with high midday self-consumption and meaningful evening battery discharge, less favorable for solar customers with limited midday usage and no battery.

The 2026 federal credit reality

The 30% federal residential tax credit (Section 25D) ended December 31, 2025 under the One Big Beautiful Bill Act signed July 4, 2025. For customer-owned solar installed in Tucson in 2026 and beyond, the federal credit is no longer available. The commercial credit (Section 48E) continues to apply to third-party-owned residential systems (leases and PPAs) through 2027\u20132030 deadlines.

Arizona\u2019s state-level programs partially offset the federal change. The Arizona Residential Solar Energy Credit (25% up to $1,000) is small but nonzero. The state property tax exemption and sales tax exemption continue. Combined, state-level value in Arizona is meaningful but substantially smaller than in states like California, Massachusetts, or Maryland. Tucson solar economics in 2026 are still defensible, particularly with battery storage and a well-designed system, but the math is tighter than it was pre-OBBBA.

Permitting and interconnection in Tucson

Residential solar in Tucson requires a building and electrical permit through the appropriate jurisdiction (City of Tucson, Town of Marana, Town of Oro Valley, Pima County, depending on your address), followed by a TEP interconnection agreement before the system can be energized. TEP uses PowerClerk for interconnection applications and has specific Electric Service Requirements standards (numbered like 702, 703, 710) that installers must follow.

The full timeline from signed contract to running system typically runs 6\u201310 weeks, with TEP interconnection often the longest single step. Arizona Senate Bill 1254 (2007) protects homeowner solar rights against HOA restrictions; HOAs cannot prohibit solar installations or impose rules that meaningfully impair function or significantly affect cost or efficiency.

Getting quotes in Tucson

Start by estimating what a system would cost and produce on your specific roof. Our solar calculator uses satellite roof analysis to size a system and estimate output and savings for your Tucson address. Then compare quotes from pre-screened local installers familiar with TEP\u2019s RCP rate structure and TOU billing requirements. Ask each installer how they\u2019d size the solar array and battery storage to maximize self-consumption given the RCP export rate; that\u2019s the design decision that most affects long-term economics in Tucson.