WashingtonSolar Panel Costs & Savings
Washington averages 3.5 hrs of peak sun per day with an average payback period of 12.5 years. Homeowners can save $22,800 over 20 years.
Peak Sun Hours
3.5 hrs
per day
6kW System Cost
$18,600
before incentives
Payback Period
12.5 yrs
average
20-Year Savings
$22,800
estimated
Solar Cost Breakdown in Washington
| Item | Amount |
|---|---|
| 6kW System Cost ($3.1/W) | $18,600 |
| Federal Tax Credit (30%) | -$5,580 |
| Net Cost | $13,020 |
Net Metering
Full Net Metering
Electricity Rate
11.26¢/kWh
Avg Monthly Bill
$106/mo
Solar Incentives in Washington
Federal Solar Investment Tax Credit (ITC)
The federal ITC allows homeowners to deduct 30% of solar installation costs from federal taxes. Available for systems installed through 2032, stepping down to 26% in 2033 and 22% in 2034.
Washington Sales Tax Exemption
Solar energy equipment is exempt from Washington state sales tax.
Solar Potential by ZIP Code in Washington
| ZIP | City | Sun Hours | Annual Savings | Payback |
|---|---|---|---|---|
| 99301 | Pasco | 4.6 hrs | $933 | 13.9 yrs |
| 98301 | Pasco | 4.5 hrs | $912 | 14.3 yrs |
| 99401 | Clarkston | 4.4 hrs | $892 | 14.6 yrs |
| 98801 | Wenatchee | 4.2 hrs | $851 | 15.3 yrs |
| 99201 | Spokane | 4.0 hrs | $811 | 16.1 yrs |
| 98601 | Amboy | 3.6 hrs | $730 | 17.9 yrs |
| 98001 | Auburn | 3.5 hrs | $709 | 18.4 yrs |
| 98401 | Tacoma | 3.5 hrs | $709 | 18.4 yrs |
| 98101 | Seattle | 3.4 hrs | $689 | 18.9 yrs |
| 98201 | Everett | 3.4 hrs | $689 | 18.9 yrs |
| 98501 | Olympia | 3.4 hrs | $689 | 18.9 yrs |
Compare With Other States
More Data for Washington
Frequently Asked Questions
How much do solar panels cost in Washington?
A typical 6kW solar system in Washington costs approximately $18,600 before incentives. After the 30% federal tax credit ($5,580), the net cost is approximately $13,020.
How long does solar take to pay for itself in Washington?
The average solar payback period in Washington is 12.5 years, slower than the national average of 9.4 years. After payback, homeowners enjoy free electricity for the remaining system life.
Does Washington have net metering?
Washington has full net metering. Homeowners receive full retail rate credits for excess solar energy sent to the grid.
How much sun does Washington get for solar?
Washington averages 3.5 peak sun hours per day, which is 1.0 hours below the national average. A 6kW system produces approximately 7,665 kWh per year.
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Data verified March 2026 · Source: NREL, DSIRE, EIA