The solar payback period — the time it takes for your cumulative electricity savings to equal the cost of your system — is the most important number when evaluating solar. The national average in 2025 is 8–10 years, but it varies enormously by state. In Hawaii, solar can pay back in under 5 years. In North Dakota, it can take over 15.
The data below assumes a $150/month electricity bill and current 2025 installation costs, electricity rates, and incentives for each state. Your actual payback will vary based on your bill size, roof orientation, and installer quotes.
States with the Fastest Solar Payback
These states combine high electricity rates, good sun, or strong net metering to deliver the fastest return on investment:
| State | Rate ($/kWh) | Peak Sun Hrs | Est. Payback |
|---|---|---|---|
| Hawaii | $0.420 | 6.5h | 3.1 years |
| California | $0.310 | 5.82h | 4.1 years |
| Rhode Island | $0.267 | 4.7h | 5.9 years |
| Massachusetts | $0.270 | 4.7h | 6.0 years |
| Connecticut | $0.256 | 4.7h | 6.4 years |
States with the Longest Solar Payback
Low electricity rates are the main culprit here. Even with excellent sun, cheap power means slower savings accumulation:
| State | Rate ($/kWh) | Peak Sun Hrs | Est. Payback |
|---|---|---|---|
| Washington | $0.109 | 4.5h | 14.2 years |
| North Dakota | $0.109 | 4.8h | 13.3 years |
| Wyoming | $0.103 | 5.5h | 12.1 years |
| Alaska | $0.243 | 3.1h | 12.1 years |
| Arkansas | $0.115 | 4.9h | 11.7 years |
Full Data: All 50 US States
| State | Rate ($/kWh) | Sun Hrs/Day | Payback (at $150/mo bill) |
|---|---|---|---|
| Hawaii | $0.420 | 6.5h | 3.1 yrs |
| California | $0.310 | 5.82h | 4.1 yrs |
| Rhode Island | $0.267 | 4.7h | 5.9 yrs |
| Massachusetts | $0.270 | 4.7h | 6.0 yrs |
| Connecticut | $0.256 | 4.7h | 6.4 yrs |
| New Hampshire | $0.248 | 4.7h | 6.4 yrs |
| New Mexico | $0.140 | 7.1h | 6.5 yrs |
| Arizona | $0.128 | 7.5h | 6.6 yrs |
| Nevada | $0.135 | 7.2h | 6.7 yrs |
| Maine | $0.235 | 4.5h | 6.8 yrs |
| New York | $0.220 | 4.79h | 7.3 yrs |
| Vermont | $0.210 | 4.6h | 7.7 yrs |
| Florida | $0.145 | 5.67h | 7.9 yrs |
| New Jersey | $0.190 | 4.8h | 8.0 yrs |
| Maryland | $0.168 | 4.8h | 8.2 yrs |
| Colorado | $0.140 | 5.5h | 8.6 yrs |
| Washington D.C. | $0.175 | 4.8h | 8.6 yrs |
| Michigan | $0.185 | 4.4h | 8.7 yrs |
| Texas | $0.138 | 5.5h | 8.7 yrs |
| Utah | $0.112 | 6.5h | 8.7 yrs |
| Wisconsin | $0.175 | 4.5h | 8.8 yrs |
| Kansas | $0.138 | 5.3h | 9.2 yrs |
| Illinois | $0.155 | 4.8h | 9.3 yrs |
| Alabama | $0.138 | 5.2h | 9.4 yrs |
| South Carolina | $0.140 | 5.1h | 9.4 yrs |
| North Carolina | $0.135 | 5.2h | 9.6 yrs |
| Pennsylvania | $0.160 | 4.6h | 9.6 yrs |
| Virginia | $0.143 | 5h | 9.6 yrs |
| Georgia | $0.133 | 5.2h | 9.7 yrs |
| Indiana | $0.145 | 4.7h | 9.8 yrs |
| Ohio | $0.155 | 4.5h | 9.8 yrs |
| Oklahoma | $0.120 | 5.6h | 9.8 yrs |
| Delaware | $0.143 | 4.8h | 10.1 yrs |
| Minnesota | $0.150 | 4.6h | 10.1 yrs |
| Mississippi | $0.125 | 5.1h | 10.3 yrs |
| Missouri | $0.128 | 5h | 10.5 yrs |
| Louisiana | $0.115 | 5.3h | 10.6 yrs |
| Tennessee | $0.122 | 5h | 10.8 yrs |
| Kentucky | $0.126 | 4.8h | 10.9 yrs |
| Iowa | $0.127 | 4.8h | 11.0 yrs |
| West Virginia | $0.130 | 4.7h | 11.0 yrs |
| Montana | $0.121 | 5.1h | 11.1 yrs |
| Nebraska | $0.117 | 5.1h | 11.2 yrs |
| Idaho | $0.111 | 5.2h | 11.4 yrs |
| Oregon | $0.136 | 4.5h | 11.4 yrs |
| South Dakota | $0.120 | 5h | 11.4 yrs |
| Arkansas | $0.115 | 4.9h | 11.7 yrs |
| Alaska | $0.243 | 3.1h | 12.1 yrs |
| Wyoming | $0.103 | 5.5h | 12.1 yrs |
| North Dakota | $0.109 | 4.8h | 13.3 yrs |
| Washington | $0.109 | 4.5h | 14.2 yrs |
Data assumes $150/month electric bill, 2025 installation costs per EnergySage, EIA electricity rates, NREL peak sun hours, and the 30% federal ITC. State rebates included where applicable. Actual results vary by roof, usage, and installer.
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?
Yes, all payback figures above are calculated on the net cost after the 30% federal ITC. Without the credit, add roughly 3–4 years to each estimate.
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.