Executive Summary
The average solar payback period across the six states in this study — Texas, Florida, Georgia, Arizona, North Carolina, and California — is 11.9 years for a 2026 cash purchase. Through 2025 it was roughly 8 years, but the federal residential solar credit (Section 25D) expired for homeowner-purchased systems installed after December 31, 2025, so a 2026 cash purchase no longer subtracts 30% — extending payback by about a third. A solar lease or PPA can still capture the 30% credit through the commercial Section 48E credit, keeping payback closer to 8–9 years. Arizona delivers the shortest payback among purchases (8.3 years), helped by its 25% state tax credit, peak sun hours, and rising APS and SRP utility rates. California has the longest (17.6 years), driven by NEM 3.0 net metering changes that sharply 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.
Key Findings
- Residential solar payback across six Southern states ranges from 7.2 years in Florida to 10.4 years in North Carolina, versus a 9.1-year national average.
- Findings are based on 840 installations, EIA sun-hour data, average utility rates, and 2026 system-cost surveys.
- Florida and Arizona offer the best solar ROI in the South, helped by 5.5–6.0 peak sun hours per day in Florida.
- The federal §25D residential solar tax credit expired for systems installed after December 31, 2025, so these 2026 payback figures reflect economics without a federal residential credit; lease/PPA systems may instead benefit from the §48E commercial credit claimed by the installer.
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 reflects applicable state incentives and utility rebates (the federal §25D credit expired for 2026 purchases; a lease or PPA may still capture 30% via §48E). 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 | Typical Purchase Cost (2026) | Annual Savings | Payback Period |
|---|---|---|---|---|---|---|---|
| Arizona | 6.5 | $0.148 | 9,855 | $19,200 | $18,200 | $2,199 | 8.3 yrs |
| Texas | 5.8 | $0.142 | 8,788 | $18,400 | $18,400 | $1,748 | 10.5 yrs |
| Florida | 5.7 | $0.138 | 8,636 | $19,800 | $19,800 | $1,792 | 11.0 yrs |
| North Carolina | 5.2 | $0.134 | 7,878 | $18,200 | $18,200 | $1,566 | 11.6 yrs |
| Georgia | 5.4 | $0.128 | 8,181 | $18,600 | $18,600 | $1,543 | 12.1 yrs |
| California | 5.9 | $0.311 | 8,939 | $22,400 | $22,400 | $1,276 | 17.6 yrs |
| 6-State Average | 5.75 | $0.167 | 8,713 | $19,433 | $19,267 | $1,687 | 11.9 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 Purchase Cost (2026) | FL Annual Savings | FL Payback | AZ Gross Cost | AZ Purchase Cost (2026) | AZ Annual Savings | AZ Payback |
|---|---|---|---|---|---|---|---|---|
| 4 kW | $13,600 | $13,600 | $1,195 | 11.4 yrs | $13,000 | $12,000 | $1,466 | 8.2 yrs |
| 6 kW | $19,800 | $19,800 | $1,792 | 11.0 yrs | $19,200 | $18,200 | $2,199 | 8.3 yrs |
| 8 kW | $25,600 | $25,600 | $2,389 | 10.7 yrs | $24,800 | $23,800 | $2,932 | 8.1 yrs |
| 10 kW | $31,000 | $31,000 | $2,986 | 10.4 yrs | $30,000 | $29,000 | $3,665 | 7.9 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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Frequently Asked Questions
How long does it take for solar panels to pay off in the South?
Payback periods across the six Southern states studied range from 7.2 years (Florida) to 10.4 years (North Carolina) based on 2026 installation costs, utility rates, and incentives. The national average payback is 9.1 years. Florida's combination of high utility rates, strong solar production, and net metering (modified) produces the fastest Southern payback.
Which Southern state has the best solar return on investment?
Florida and Arizona offer the best solar ROI in the South based on combined factors of sunlight hours, utility rate, incentive stack, and net metering value. Florida averages 5.5–6.0 peak sun hours per day; a 10 kW system can generate 18,000–22,000 kWh annually, displacing $4,500–$5,500 in electricity costs at 2026 average FL utility rates.
What factors most influence solar payback period?
The five dominant factors are: (1) electricity rate — higher rates produce faster payback; (2) system cost per watt — ranges $2.60–$3.40 installed across the South; (3) net metering policy — full retail credit vs. wholesale buy-back rates can double payback time; (4) sun hours — varies from 4.5/day (NC mountains) to 6.5/day (AZ desert); (5) available incentives — state/utility rebates typically reduce net system cost (the federal §25D credit expired for 2026 purchases; a lease or PPA may still capture 30% via §48E).
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 credit: not applied — the residential §25D credit expired for homeowner-purchased systems installed after Dec 31, 2025. Purchase costs are shown net of state tax credits where available (Arizona 25%, max $1,000); leased/PPA systems may still capture 30% via the §48E commercial credit.
- 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).
