Solar panel cost in O'Fallon, MO (2026)
A typical O'Fallon home needs about a 9.6 kW system (~24 panels), costing roughly $27,360 upfront or $25,860 after state incentives. The 30% federal credit ended for purchases on Dec 31, 2025 (a lease/PPA can still pass it through). At 4.5 peak sun hours and Missouri's 13¢/kWh rate, it pays back in about 15.8 years and saves an estimated $29,822 over 25 years.
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| Annual electricity use | 12,646 kWh |
| Annual solar production | 12,614 kWh |
| Gross system cost | $27,360 |
| Federal tax credit (purchase) | Ended Dec 2025 |
| State / local incentives | – $1,500 |
| 30% via lease/PPA instead | ~$8,208 value |
| CO₂ avoided per year | 4.4 tons (~73 trees) |
Estimates only — not a quote or financial advice. See our methodology.
What makes O'Fallon different
O'Fallon (population ~85,040) gets 4.5 peak sun hours per day — that's 6% less sunny than the Missouri average of 4.8. Slightly less local sunlight means panels produce a touch less than the state average, so sizing and orientation matter. Electricity rates, net metering, and incentives are set at the Missouri level: residents pay about 13¢/kWh, and full net metering + utility rebates ($0.25–0.50/w).
| City peak sun hours | 4.5 hrs/day |
| Recommended system size | 9.6 kW (~24 panels) |
| Installed price per watt | $3/W |
| Gross system cost | $27,360 |
| Federal tax credit (purchase) | Ended Dec 31, 2025 |
| State / local incentives | – $1,500 |
| Net cash cost | $25,860 |
| 30% credit via lease/PPA | ~$8,208 value |
| Annual energy produced | 12,614 kWh |
| Estimated year-1 savings | $1,638 |
| Payback period | 15.8 years |
| 25-year net savings | $29,822 |
| CO₂ avoided per year | 4.4 tons (~73 trees) |
Compare with the Missouri state average (9 kW, $24,150 net, 14.7-yr payback). Modeled estimates, June 2026 — not a quote. See methodology.
Compare real solar quotes in O'Fallon, MO
See actual prices from vetted local installers — including lease and PPA options that still capture the 30% credit in 2026. Free, no obligation.