Solar Panel Cost in Washington (2026)
In Washington, home solar installs for roughly $2.85/watt in 2026. A typical 8 kW system runs about $22,800, with an estimated payback near 18.5 years at the state's ~14¢/kWh electricity rate.
| System size | Est. cost | Est. annual savings | Payback |
|---|---|---|---|
| 6 kW | $17,100 | $900/yr | 18.5 yrs |
| 8 kW | $22,800 | $1,200/yr | 18.5 yrs |
| 11 kW | $31,400 | $1,700/yr | 18.5 yrs |
Estimates use ~$2.85/watt installed and Washington's ~14¢/kWh rate. Before any state/local incentives.
Washington solar notes
Washington guarantees retail net metering until a utility hits its cap and waives sales tax on residential solar, but very low hydro-based rates and limited sun lengthen payback.
Heads up: the 30% federal tax credit for purchased home solar ended Dec 31, 2025. Leased/PPA systems may still qualify through 2027, and Washington may offer its own incentives — check locally.
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