Solar panels in Washington
What a residential solar system actually costs in Washington in 2026 — plus incentives, payback, and how to pick a vetted installer.
The real cost of solar in Washington
A typical 9.5 kW rooftop system in Washington runs about $28,500 installed. The federal Residential Clean Energy Credit knocks 30% off — around $8,550 — bringing the net price to roughly $19,950.
Washington adds its own incentive: Sales tax exemption. Stack that on top of the federal credit. Washington also waives sales tax on solar equipment.
What you'll produce — and save
- ~10,541 kWh/year from a 9.5 kW system at 3.8 peak sun hours.
- At 11.6¢/kWh that's $1,223/yr off your electric bill in year one.
- Estimated payback: 16.3 years.
- 25-year net savings (2.5% annual rate escalation): $21,825.
Estimates only. Actual production depends on roof orientation, shade, equipment and your utility's specific tariff.
Net metering in Washington
Washington operates under a full retail policy for residential solar exports. Every kWh you export offsets a kWh you consume at retail rates — the strongest policy for homeowner economics.
Top Washington metros we cover
FAQ
How much do solar panels cost in Washington?
A typical 9.5 kW residential system in Washington costs about $28,500 before incentives, or roughly $3.00 per watt installed. After the 30% federal tax credit that drops to about $19,950.
Is solar worth it in Washington?
With an average residential electricity rate of 11.6¢/kWh and 3.8 peak sun hours per day, a properly sized system typically pays for itself in about 16.3 years and saves roughly $21,825 over 25 years.
Does Washington have net metering?
Washington operates under a full retail policy for residential solar exports. Exact credit values vary by utility — always confirm with the specific utility serving your address.
What state incentives are available in Washington?
State incentive: Sales tax exemption. Property tax exemption: No. Sales tax exemption: Yes. The 30% federal Residential Clean Energy Credit also applies.
Get vetted Washington installer quotes.
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Sources: EIA average residential electricity rates, NREL PVWatts sun hour data, DSIRE state incentive database, LBNL "Tracking the Sun" installed-cost benchmarks. Figures are estimates for guidance only, not a binding quote.