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Solar Panel Cost in Washington
6 kW system cost and incentives for Washington homeowners.
By Jessica Martinez · Updated June 20266 kW system cost and incentives for Washington homeowners.
By Jessica Martinez · Updated June 2026A 6 kW home solar system in Washington runs about $20,700 before incentives. For Washington homeowners, the 30% federal tax credit brings that to roughly $14,490 out of pocket, a difference of about $6,210.
Seattle averages around 3.5 peak sun hours a day, while Spokane is closer to 4.5. The solar cost calculator narrows that down to your actual Washington home.
| System size | 6 kW |
|---|---|
| Price before incentives | $20,700 |
| 30% federal tax credit | -$6,210 |
| Price after credit | $14,490 |
Washington exempts solar equipment from sales tax.
Puget Sound Energy and Pacific Power both offer net metering. Use the system size calculator to match panel count to your actual Washington usage rather than a flat 6 kW.
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What will a 6 kW system cost me in Washington? Plan on about $20,700 before incentives and about $14,490 after the 30% federal credit in Washington, which works out to roughly $6,210 in savings.
What else affects solar savings in Washington beyond the federal credit? Actual Washington pricing still comes down to your roof, your installer, and the quotes you collect.
Where can I run my own numbers for your Washington system? Use the solar cost calculator for installed price, the system size calculator for panel count, and the savings calculator for payback specific to your Washington address.