Solar Panels in Washington: Cost, Savings & Incentives (2026)
How much do solar panels cost in Washington in 2026? Typical 8.0 kW system: $16,800 after 30% ITC, 25-year payback, 4.0 sun hrs/day, 10.8¢/kWh. Free calculators.
Calculate your exact Washington numbers
Pre-loaded with Washington electricity rates and sun hours — free, instant, no signup.
Washington solar decision guides
Data hub — jump to in-depth sizing, bill-based, or policy guides. This page stays focused on rates & incentives.
Washington solar snapshot (2026)
A 8 kW system in Washington produces roughly 9,344 kWh/year at 4 peak sun hours and 10.8¢/kWh — saving about $1,009/year with ~16-year payback after the 30% ITC.
| Cost item | Amount |
|---|---|
| System cost (8 kW) | $24,000 |
| Federal 30% ITC | −$7,200 |
| Net cost after ITC | $16,800 |
| Est. annual savings | $1,009/yr |
| 25-year net profit (est.) | $8,425 |
Get at least 3 installer quotes — pricing varies up to 30% within the same state.
Washington solar incentives
Federal ITC — 30%
All US homeowners qualify for the 30% federal Investment Tax Credit through 2032. On a $24,000 system, that's a $7,200 dollar-for-dollar tax credit.
Washington state programs
Washington State exempts solar energy systems from the state sales tax, saving homeowners the 6.5% state sales tax on equipment purchases. Puget Sound Energy and other utilities offer net metering at the full retail rate. Washington's low electricity rates from hydropower reduce savings potential, but the sales tax exemption provides immediate upfront savings.
Is solar worth it in Washington?
Washington homeowners benefit most when system size matches actual usage and roof orientation is south-facing. Use the calculators above for a bill-specific estimate, or open a decision guide below for sizing by monthly bill or home sq ft.
Frequently asked questions
Direct answers for US homeowners in Washington.