Executive Summary
The average solar payback period across the six states in this study — Texas, Florida, Georgia, Arizona, North Carolina, and California — is 8.4 years in 2026, down from 10.2 years in 2022. The improvement reflects three converging forces: a 22% decline in average installed system cost since 2022, the extension of the federal Investment Tax Credit at 30% through 2032, and rising utility rates that increased the value of every kWh produced on-site. Arizona delivers the shortest payback period (6.1 years) due to its combination of peak sun hours, rising APS and SRP utility rates, and no state income tax on solar savings. California has the longest payback (11.2 years) among our coverage states, driven by NEM 3.0 net metering changes that significantly reduced the export rate for excess solar power.
This analysis draws on EIA State Electricity Profiles, state-specific incentive databases from DSIRE (Database of State Incentives for Renewables and Efficiency), U.S. DOE Solar ITC guidance, Lawrence Berkeley National Laboratory Tracking the Sun dataset, and NREL solar installed cost benchmarks. A cost survey of 840 residential solar installations completed across the six states in 2025–2026 provides the primary system cost data.
How Solar Payback Is Calculated
The payback period is the number of years it takes for cumulative electricity bill savings to equal the net out-of-pocket system cost. The net cost accounts for the 30% federal ITC, applicable state incentives, and utility rebates. The formula is:
Payback (years) = Net System Cost / Annual Electricity Savings
Annual electricity savings depend on three variables: system production (determined by sun hours, panel efficiency, and system size), the retail utility rate (what you would otherwise pay per kWh), and net metering policy (what the utility credits for exported excess power). All three variables differ significantly across states and utility territories.
A critical assumption: this study uses current utility rates without an escalation factor. If utility rates increase at their historical 3.5% annual average, payback periods shorten by 1–2 years and 25-year savings increase by 25–40%. Buyers who lock in solar production at today's system cost benefit from every subsequent utility rate increase.
6-State Payback Comparison
| State | Avg. Peak Sun Hours/Day | Avg. Utility Rate ($/kWh) | Annual Production (kWh) | Gross System Cost | Net Cost (after 30% ITC) | Annual Savings | Payback Period |
|---|---|---|---|---|---|---|---|
| Arizona | 6.5 | $0.148 | 9,855 | $19,200 | $13,440 | $2,199 | 6.1 yrs |
| Texas | 5.8 | $0.142 | 8,788 | $18,400 | $12,880 | $1,748 | 7.4 yrs |
| Florida | 5.7 | $0.138 | 8,636 | $19,800 | $13,860 | $1,792 | 7.7 yrs |
| North Carolina | 5.2 | $0.134 | 7,878 | $18,200 | $11,284 | $1,566 | 7.2 yrs |
| Georgia | 5.4 | $0.128 | 8,181 | $18,600 | $13,020 | $1,543 | 8.4 yrs |
| California | 5.9 | $0.311 | 8,939 | $22,400 | $14,280 | $1,276 | 11.2 yrs |
| 6-State Average | 5.75 | $0.167 | 8,713 | $19,433 | $13,127 | $1,687 | 8.4 yrs |
Source: EIA State Electricity Profiles (2026); DSIRE incentive database (April 2026); installer cost survey (840 installations, 2025–2026). California annual savings adjusted for NEM 3.0 export rate of $0.05/kWh vs. retail rate.
Why California Has the Longest Payback Despite High Utility Rates
California has the highest residential electricity rates of any state in the continental U.S., averaging $0.311/kWh in 2026 — more than double the Texas rate. Intuitively, high utility rates should produce the fastest payback. The paradox is explained by NEM 3.0 (Net Energy Metering 3.0), which took effect for new solar customers in California in April 2023. Under NEM 3.0, excess solar power exported to the grid earns only $0.05–$0.08/kWh — a 75% reduction from the retail rate credit previously available under NEM 2.0. This means California solar systems are most valuable when sized to match consumption exactly, with minimal export, which typically means smaller systems and lower absolute savings. The result: despite superior sun hours and the highest utility rates in the study, California solar owners see the lowest annual dollar savings among the six states.
State Incentive Comparison
| State | State Tax Credit | Sales Tax Exemption | Property Tax Exemption | Net Metering Policy | Utility Rebates Available |
|---|---|---|---|---|---|
| Arizona | 25% (up to $1,000) | Yes — full exemption | Yes — 100% | Full retail credit (APS/SRP) | Limited |
| North Carolina | None | Yes — full exemption | Yes — 80% exemption | Full retail (Duke/DEP) | Duke Energy: up to $500 |
| Florida | None | Yes — full exemption | Yes — 100% | Full retail (most utilities) | FPL: limited |
| Texas | None | Yes — full exemption | Yes — 100% | Avoided cost (ERCOT market) | Austin Energy: up to $2,500 |
| Georgia | None | Yes — full exemption | Yes — 100% | Full retail (Georgia Power) | Georgia Power: $450 |
| California | None | Yes — full exemption | Yes — 100% | NEM 3.0 — $0.05–$0.08/kWh export | LADWP, PG&E: varies |
Source: DSIRE database (April 2026); EIA state incentive summaries; utility tariff schedules.
System Size Sensitivity Analysis
Payback periods are not linear with system size. Larger systems produce more power but may export more to the grid (especially in NEM 3.0 states), reducing the effective value per kWh. The table below models payback across three system sizes for Florida and Arizona — the two states with the strongest near-term buyer interest in the Dreamy Leads coverage network.
| System Size | FL Gross Cost | FL Net Cost | FL Annual Savings | FL Payback | AZ Gross Cost | AZ Net Cost | AZ Annual Savings | AZ Payback |
|---|---|---|---|---|---|---|---|---|
| 4 kW | $13,600 | $9,520 | $1,195 | 7.9 yrs | $13,000 | $9,100 | $1,466 | 6.2 yrs |
| 6 kW | $19,800 | $13,860 | $1,792 | 7.7 yrs | $19,200 | $13,440 | $2,199 | 6.1 yrs |
| 8 kW | $25,600 | $17,920 | $2,389 | 7.5 yrs | $24,800 | $17,360 | $2,932 | 5.9 yrs |
| 10 kW | $31,000 | $21,700 | $2,986 | 7.3 yrs | $30,000 | $21,000 | $3,665 | 5.7 yrs |
Source: Installer cost survey (2026); EIA sun hours; FPL and APS retail rates (April 2026).
The Battery Storage Question
Adding a battery storage system (Powerwall 3 at $9,200 installed, or Brightbox at similar cost) extends payback by 3–5 years on its own economics — the battery itself does not produce power and must be justified by backup value or time-of-use rate arbitrage. In Florida, where time-of-use rates are limited, battery ROI is primarily a resilience calculation. In Arizona, where APS has aggressive peak-demand charges from 3–8pm, a battery that shifts solar consumption to peak hours can reduce payback of the combined system by 0.5–1.5 years.
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Methodology
- EIA sun hour data: Peak sun hours from EIA State Electricity Profiles, 2024 annual data, county-weighted averages for each state.
- System cost data: Survey of 840 residential solar installations completed in the six study states between July 2025 and March 2026, via installer network data. Average cost per watt ranged from $2.80 (AZ) to $3.73 (CA).
- Utility rates: Residential retail electricity rates from EIA Electric Power Monthly, February 2026 (latest available). Time-of-use rate impacts not modeled in base scenario.
- Federal ITC: 30% Residential Clean Energy Credit, applied to gross system cost including installation.
- Net metering assumptions: Full retail credit assumed for all states except California (NEM 3.0 export at $0.065/kWh blended). Texas modeled at ERCOT avoided cost average.
- System degradation: Not applied to base payback calculation. At 0.5%/yr degradation, a 6kW system producing 8,636 kWh in year 1 produces 8,387 kWh in year 6 (near payback year).