Washington homeowners who go solar in 2026 can expect to pay an average of $13,200 to $17,600 for a fully installed 8 kW system — before incentives. Once you stack the 30% federal tax credit with Washington’s own sales-tax exemption on solar hardware, the out-of-pocket cost can drop by more than $4,500 on a typical install. That makes the Pacific Northwest a better solar market than most people assume, even if it is not the sunniest state in the country.
The case for solar in Washington is quieter but steadier than in Arizona or California. The state’s average residential electricity rate sat at around 10.3 cents per kWh in late 2024, according to EIA data — below the national average — but rates from Puget Sound Energy and Pacific Power have climbed roughly 6% annually over the past five years and show no sign of levelling off. Locking in generation at today’s cost is, in practical terms, a hedge against utility bill inflation. A well-sized system in western Washington typically offsets 80–95% of annual household consumption.
What follows covers real installed costs, the incentives you can actually claim, what the grid looks like for net metering, and how long you should expect to wait before the system pays for itself.
