The solar payback period — the time it takes for your cumulative electricity savings to equal the cost of your system — is one of the most useful numbers when evaluating solar. It varies enormously by state because electricity rates, sun hours, and installation costs all differ. In Hawaii, solar can pay back in well under 10 years on gross cost alone. In low-rate states like North Dakota or Washington, gross payback can run past 15 years.
The data below assumes a $150/month electricity bill and each state's electricity rate, peak sun hours, and installation cost per kW as tracked in our electricity rate dataset. These are gross figures — no incentives of any kind are subtracted. Your actual payback will also vary based on your bill size, roof orientation, and installer quotes.
States with the Fastest Solar Payback
These states combine high electricity rates, good sun, or strong net metering to deliver the fastest return on investment:
| State | Rate ($/kWh) | Peak Sun Hrs | Est. Payback |
|---|---|---|---|
| Hawaii | $0.420 | 6.5h | 4.4 years |
| California | $0.310 | 5.82h | 5.9 years |
| Rhode Island | $0.267 | 4.7h | 8.5 years |
| Massachusetts | $0.270 | 4.7h | 8.6 years |
| Connecticut | $0.256 | 4.7h | 9.1 years |
States with the Longest Solar Payback
Low electricity rates are the main culprit here. Even with excellent sun, cheap power means slower savings accumulation:
| State | Rate ($/kWh) | Peak Sun Hrs | Est. Payback |
|---|---|---|---|
| Washington | $0.109 | 4.5h | 20.2 years |
| North Dakota | $0.109 | 4.8h | 19.0 years |
| Alaska | $0.243 | 3.1h | 17.3 years |
| Wyoming | $0.103 | 5.5h | 17.2 years |
| Arkansas | $0.115 | 4.9h | 16.7 years |
Full Data: All 50 US States
| State | Rate ($/kWh) | Sun Hrs/Day | Payback (at $150/mo bill) |
|---|---|---|---|
| Hawaii | $0.420 | 6.5h | 4.4 yrs |
| California | $0.310 | 5.82h | 5.9 yrs |
| Rhode Island | $0.267 | 4.7h | 8.5 yrs |
| Massachusetts | $0.270 | 4.7h | 8.6 yrs |
| Connecticut | $0.256 | 4.7h | 9.1 yrs |
| New Hampshire | $0.248 | 4.7h | 9.1 yrs |
| New Mexico | $0.140 | 7.1h | 9.3 yrs |
| Arizona | $0.128 | 7.5h | 9.5 yrs |
| Nevada | $0.135 | 7.2h | 9.5 yrs |
| Maine | $0.235 | 4.5h | 9.7 yrs |
| New York | $0.220 | 4.79h | 10.4 yrs |
| Vermont | $0.210 | 4.6h | 11.0 yrs |
| Florida | $0.145 | 5.67h | 11.2 yrs |
| New Jersey | $0.190 | 4.8h | 11.5 yrs |
| Washington D.C. | $0.175 | 4.8h | 12.2 yrs |
| Michigan | $0.185 | 4.4h | 12.4 yrs |
| Texas | $0.138 | 5.5h | 12.4 yrs |
| Maryland | $0.168 | 4.8h | 12.5 yrs |
| Wisconsin | $0.175 | 4.5h | 12.6 yrs |
| Colorado | $0.140 | 5.5h | 12.7 yrs |
| Utah | $0.112 | 6.5h | 12.7 yrs |
| Kansas | $0.138 | 5.3h | 13.1 yrs |
| Illinois | $0.155 | 4.8h | 13.3 yrs |
| Alabama | $0.138 | 5.2h | 13.4 yrs |
| South Carolina | $0.140 | 5.1h | 13.4 yrs |
| North Carolina | $0.135 | 5.2h | 13.7 yrs |
| Pennsylvania | $0.160 | 4.6h | 13.7 yrs |
| Virginia | $0.143 | 5h | 13.7 yrs |
| Georgia | $0.133 | 5.2h | 13.9 yrs |
| Ohio | $0.155 | 4.5h | 14.0 yrs |
| Oklahoma | $0.120 | 5.6h | 14.0 yrs |
| Indiana | $0.145 | 4.7h | 14.1 yrs |
| Minnesota | $0.150 | 4.6h | 14.4 yrs |
| Delaware | $0.143 | 4.8h | 14.5 yrs |
| Mississippi | $0.125 | 5.1h | 14.8 yrs |
| Missouri | $0.128 | 5h | 15.0 yrs |
| Louisiana | $0.115 | 5.3h | 15.2 yrs |
| Tennessee | $0.122 | 5h | 15.4 yrs |
| Kentucky | $0.126 | 4.8h | 15.6 yrs |
| Iowa | $0.127 | 4.8h | 15.7 yrs |
| West Virginia | $0.130 | 4.7h | 15.7 yrs |
| Montana | $0.121 | 5.1h | 15.8 yrs |
| Nebraska | $0.117 | 5.1h | 16.1 yrs |
| Oregon | $0.136 | 4.5h | 16.2 yrs |
| Idaho | $0.111 | 5.2h | 16.3 yrs |
| South Dakota | $0.120 | 5h | 16.3 yrs |
| Arkansas | $0.115 | 4.9h | 16.7 yrs |
| Wyoming | $0.103 | 5.5h | 17.2 yrs |
| Alaska | $0.243 | 3.1h | 17.3 yrs |
| North Dakota | $0.109 | 4.8h | 19.0 yrs |
| Washington | $0.109 | 4.5h | 20.2 yrs |
Data assumes a $150/month electric bill, installation cost estimates per kW, EIA electricity rates, and NREL peak sun hours. No federal, state, provincial, or utility incentive is subtracted — these are gross payback periods. Actual results vary by roof, usage, and installer quote.
What Drives the Payback Period?
1. Electricity Rate (Biggest Factor)
Your electricity rate determines how much money each kWh of solar production is worth. Hawaii pays $0.42/kWh while North Dakota pays $0.109/kWh — a 4× difference that directly drives a 4× difference in annual savings.
2. Peak Sun Hours
More sun = more kWh produced = faster payback. The Southwest (Arizona, Nevada, New Mexico) wins here with 7+ hours daily vs. New England's 4.5–4.7 hours.
3. Net Metering Policy
States with full net metering (Florida, New York, Massachusetts) allow you to "bank" daytime excess production, effectively running your meter backward. States with partial or no net metering (Texas, Arizona, California NEM 3.0) reduce the value of that excess.
4. Installation Cost
Costs vary by state due to labor markets and permit complexity. Hawaii and Northeast states average $3,100–$3,500/kW; Sunbelt states average $2,650–$2,750/kW. Shop at least 3 local installers.
Your Personalized Payback Estimate
The table above uses a $150/month bill as the baseline. Your payback will be shorter if your bill is higher, and longer if it's lower. Use our free calculator with your actual bill size:
Frequently Asked Questions
Does the payback period include the 30% federal tax credit?
No. The federal Residential Clean Energy Credit applied to spending through 2025-12-31 and does not apply to systems installed in 2026 or later, so it is not part of any figure on this page. If you installed before that date and claimed the credit, or if you qualify for a currently verified state, provincial, or utility incentive, your real payback will be shorter than the gross figure shown here.
How does a higher monthly bill affect payback?
A higher bill means you need a larger system — but you also save more per year. In most states, doubling your bill from $100 to $200 reduces the payback period because the larger system captures better economies of scale on installation cost per kW.
What happens after payback?
Every year after your payback period is pure savings — typically $1,500–$3,000/year depending on your location. With electricity rates rising ~3% annually, year 15 savings are worth more than year 5 savings.