Solar Payback Period in Illinois (2026)
Updated 2026-07-07 · MySunROI Research
The average solar payback period in Illinois is 9.9 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: $11,780. Annual savings: ~$1,190. Simple payback ≈ 9.9 years.
Actual payback varies by system size, roof, shading, and rate plan.
- Low: 7.3 years · Avg: 9.9 · High: 13.8 years
What affects payback in Illinois
Illinois install costs average $2.81/W with estimated 9.9-year payback on a 6 kW system — near US national averages.
- Electricity rate (14.5¢/kWh)
- Install cost ($3/watt)
- Production (4.4 peak sun hours)
- Compare at least three installer quotes in Illinois
- Model payback using your actual utility rate and usage
Savings after payback
30-year savings: $24,500–$41,100.
Illinois quick stats
- 6 kW after ITC
- $11,780
- Payback
- 9.9 years
- Electric rate
- 14.5¢/kWh
- Annual savings
- $1,190
Frequently Asked Questions
Average payback in Illinois?
9.9 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.