Solar Panel ROI: What the Data Actually Shows Across 50 States
We crunched solar irradiance, installation costs, and electricity rates for all 50 states. The narrative you hear — "solar only makes sense in sunny states" — turns out to be mostly wrong. Electricity rates matter more than sunshine.
The Metric That Actually Matters: Payback Period
ROI in solar is typically measured by payback period — how many years until your cumulative electricity savings cover the net system cost. A system that pays back in 7 years and lasts 25 generates roughly 2.5x its cost in savings. One that pays back in 12 years generates about 1.5x. Under 8 years is generally considered excellent.
The payback equation has three variables: system cost (relatively flat across regions), solar irradiance (how much sun you get), and electricity rate (what you pay per kWh). That third variable is the surprise.
Top Performers: Not Just the Sunny States
The states with the best solar ROI in our data aren't all desert Southwest. Massachusetts, Rhode Island, and New Hampshire all rank in the top 10 — not because they're sunny, but because their electricity rates are among the highest in the country ($0.23–$0.28/kWh). Every kWh your panels produce is worth more.
Our top-performing states for payback period:
- Massachusetts — High rates + state tax credit = 6–7 year payback
- California — High rates + strong sun + NEM 3.0 caveats
- New York — 25% state credit makes the math compelling
- Hawaii — Electricity rates over $0.40/kWh make solar a no-brainer
- Arizona — Best irradiance in the continental US
The Middle Tier: Solid But Not Spectacular
Most of the South and Midwest falls into a 9–12 year payback range. Texas is interesting here — excellent sun, but electricity rates of only $0.12–$0.14/kWh dampen the returns compared to what you'd expect from a state with that much solar resource. Florida is similar: good sun, moderate rates, 8–10 year payback.
The Midwest (Ohio, Indiana, Michigan) has mediocre sun and moderate electricity rates. ROI is present but unexciting — typically 10–13 year paybacks. Still beats a broad stock market index for the right homeowner with a long horizon.
The Outliers: Where Solar Rarely Makes Sense
A handful of states have electricity rates so low that solar struggles to generate meaningful returns. Louisiana averages around $0.09/kWh — roughly half the national average. At that rate, even a well-sited system in a sunny location takes 15+ years to pay back, which is marginal given that panels degrade and inverters need replacing over that timeframe.
Other states with challenging economics: Washington (cheap hydro power), Wyoming, and parts of the Mountain West where natural gas keeps rates low.
What Changed Since 2023
Three things shifted the national picture over the past two years:
- Equipment costs fell further. Average installed cost per watt dropped from ~$3.10 to ~$2.80, shaving $1,800 off a typical 6kW system.
- Electricity rates rose almost everywhere. The national average climbed from $0.145 to $0.163/kWh — a 12% jump. Higher rates directly improve payback math.
- California's NEM 3.0 changed the calculus. California's new net metering rules reduced export rates significantly. Solar still makes sense there due to high retail rates, but the economics shifted.
The National Average
Across all 50 states, the median payback period on a 6kW residential solar system in 2026 is approximately 9.5 years after the 30% federal tax credit. Twenty-five year savings average around $28,000. That's not a lottery ticket — but it's a reliable, tax-advantaged return on a home improvement that also reduces your carbon footprint.
Check the full state-by-state data to see where your state falls, or run your own numbers with the interactive calculator.