Solar Payback Period in Washington (2026)
Updated 2026-07-07 · MySunROI Research
The average solar payback period in Washington is 15.8 years for a 6 kW system (2026). After break-even, electricity savings continue for 15–20+ more years.
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Payback timeline
Net install cost after 30% ITC: $12,940. Annual savings: ~$820. Simple payback ≈ 15.8 years.
Actual payback varies by system size, roof, shading, and rate plan.
- Low: 11.7 years · Avg: 15.8 · High: 22.2 years
What affects payback in Washington
Washington install costs average $3.08/W with estimated 15.8-year payback on a 6 kW system — above US national averages.
- Electricity rate (11¢/kWh)
- Install cost ($3/watt)
- Production (4 peak sun hours)
- Compare at least three installer quotes in Washington
- Model payback using your actual utility rate and usage
Savings after payback
30-year savings: $16,750–$28,200.
Washington quick stats
- 6 kW after ITC
- $12,940
- Payback
- 15.8 years
- Electric rate
- 11¢/kWh
- Annual savings
- $820
Frequently Asked Questions
Average payback in Washington?
15.8 years for a 6 kW system after ITC.
Is 10 years good?
Yes — under 12 years is solid; under 8 is excellent.
Related pages
How We Calculate Solar Costs
MySunROI estimates combine NREL residential PV installed-price benchmarks, EIA state electricity rates, and regional labor modifiers — updated 2026-07-07.
Estimates only — not tax or financial advice. Estimates based on NREL PV cost benchmarks, EIA electricity rates, and 2026 installer pricing surveys.