Solar in O'Fallon, MO
With Ameren Missouri's electricity at about 13.9¢ per kWh and 1,408 kWh of sun per kW, solar is a close call for a typical O'Fallon home today: about a 15.6-year payback.
- Payback, typical home
- 15.6 yrsMissouri: 15.5 yrs
- 25-year net
- $13,650after paying $19,950
- Sun
- 1,408kWh per kW per year
- Electricity
- 13.9¢23% below U.S. average
A typical O'Fallon home, by the numbers
| Utility | Ameren Missouri |
|---|---|
| Electricity use | 1,032 kWh a month |
| Best-value system | 7 kW, about 16 panels, 9,857 kWh a year (80% of use) |
| Cost | $19,950 |
| First-year savings | $1,357 |
| Payback | 15.6 years |
| Exported power | 4.6¢/kWh (Ameren Missouri) |
Cash purchase, no federal credit, 1.7% yearly rate increases. Run it with your own numbers.
Homes in O'Fallon
- Owner-occupied homes
- 81%
- Single-family detached
- 75%
- Median home value
- $326k
- Median year built
- 2000
- Population
- 93,801
- Roofs suitable for solar†
- 96%
Census ACS 2020–2024. †Share of 22,737 buildings Google Project Sunroof rated technically suitable (2019 snapshot).
Installers working in O'Fallon
Public installation records for Missouri don't name installers, so we can't rank local companies here. Browse installers in Missouri.
Always verify the license and get at least three quotes. Compare quotes side by side.
Questions about solar in O'Fallon
Is solar worth it in O'Fallon, MO?
For a typical home in O'Fallon, solar is a close call at 2026 prices: a 7 kW system costs about $19,950 after state incentives, saves about $1,357 in year one and pays back in about 15.6 years. Enter your address for an estimate based on your roof and bill.
How much solar power does a system produce in O'Fallon?
About 1,408 kWh per year for each kW of panels on a south-facing roof, based on PVWatts and local weather. That's 0% less than the Missouri average. East- or west-facing roofs produce roughly 10–20% less.
Who is the electric utility in O'Fallon?
Most homes in O'Fallon are served by Ameren Missouri, at about 13.9¢ per kWh on average. Some areas are served by Cuivre River Electric Cooperative.
How much do solar panels cost in O'Fallon?
A fair cash price is around $2.85 per watt before incentives, so about $19,950 for a 7 kW system. There's no federal tax credit for homeowners who buy in 2026.
Nearby
- St. Peters 15.6 yrs
- Wentzville 15.6 yrs
- St. Charles 15.7 yrs
- Chesterfield 16.8 yrs
- Maryland Heights 16.7 yrs
- Wildwood 16.1 yrs
- Ballwin 16.3 yrs
- Hazelwood 16 yrs
- All of Missouri
Data: PVWatts (National Laboratory of the Rockies), EIA-861 2025 adjusted to 2026, U.S. Census ACS, LBNL Tracking the Sun, state policy research as of October 2026.