A real cost breakdown for a typical 6kW system in Washington, not just a national $/watt figure.
Washington has one of the lower electricity rates in the country at approximately $0.11/kWh, and a below-average solar resource, which some systems offset by sizing larger at 3.4 peak sun hours a day. Combined with a regional installed-cost estimate of $2.90/watt, a standard 6kW residential system runs approximately $15,140 before any incentives.
| Line item | Estimated cost | Share of total |
|---|---|---|
| Equipment (panels, inverter, racking) | $9,570 | 63% |
| Labor / installation | $5,220 | 34% |
| Permitting & inspection | $350 | 2% |
| Total (before incentives) | $15,140 | 100% |
A 6kW system in Washington costs 11% less than the average across the 25 states we track ($17,060), and the electricity rate it offsets is 31% lower than the 0.16 USD/kWh average across those same states. That combination is what actually determines whether Washington is a faster- or slower-than-average place to go solar — a lower system cost alone doesn't help if the rate you're offsetting is also low, and vice versa. See how every state stacks up on the Electricity & Solar Rate Tracker.
At $655 in estimated annual value from 5,957 kWh of yearly production, this system pays back in roughly 23 years — a longer payback period than the national average. Washington: Net metering at retail rate, low electricity rates limit payback speed. On incentives specifically: Washington's low hydro-powered electricity rates mean solar payback is naturally longer here than in most states. The federal residential tax credit (Section 25D) expired for owned systems after December 31, 2025 — see our 2026 tax credit guide for what that means for your net price.
A typical 6kW residential solar system in Washington costs approximately $15,140 installed in 2026, based on a regional estimate of $2.52/watt — equipment usually makes up about 55% of that, labor about 30%, with the rest in permitting.
At Washington's average rate of $0.11/kWh, a 6kW system pays back in roughly 23 years — a longer payback period than the national average. Your actual number depends on your usage and roof; check it precisely with the Solar Panel Cost Calculator.
A 6kW system in Washington costs 11% less than the 25-state average of $17,060, while the electricity rate it offsets is 31% lower than the 0.16 USD/kWh average across those states.