Is solar worth it in Illinois?
Short answer for a typical Illinois home: a reasonable payback if you'll stay put — roughly 11.2 years to break even after the 30% credit. Run your own bill through the calculator below.
Illinois gets moderate sunshine — about 4 peak sun hours a day — and residential electricity runs around $0.16/kWh. For a typical $150-a-month power bill, that points to roughly a 9.6-kW system costing about $20,227 after the 30% federal tax credit, paying for itself in about 11.2 years and netting on the order of $41,138 over 25 years. Your own numbers will differ — the calculator above uses your real bill.
Illinois pairs modest sun with a strong state incentive (Illinois Shines / SREC program) that can meaningfully cut net cost. Combined with the federal credit, payback is better than the sunshine alone would suggest.
What changes the math in Illinois
- Your electricity rate — the more you pay per kWh, the more each solar kWh saves you. Illinois sits at about $0.16.
- Sun hours — more sun means a smaller, cheaper system covers the same usage. Illinois averages ~4 hours.
- Net metering / buyback — how your utility credits power you export swings the payback; check your specific utility's current terms.
- Install cost — quotes vary by installer and roof; the calculator defaults to a typical $/watt you can override.