O Fallon, IL solar installation & market data
Updated September 22, 2026 By The SolarDNA Data Team
O Fallon has 752 solar installations across 1 zip code, installations down 11.8% over the trailing twelve months, and an installs-weighted Market Score of 42.
Active installations
752
Zip markets
1
Median cost
—
12-mo growth
▼ 11.8%
Installers active
12
City Market Score
Good · installs-weighted across 1 zips
Best zip in O Fallon scores higher than 48% of U.S. zip markets.
Versus Illinois
How O Fallon compares with the state
Installed cost
—
state median $6.56/W
Market score
42 vs 43
Illinois scores 43
Share of state installs
0.67%
of 112.7K tracked statewide
Battery attach
0.0%
state 0.0%
Statewide momentum
▲ 23.1%
residential solar added in Illinois, 12 months through Jul 2026
Statewide market
136.9K systems
4.0% of homes · utility-reported through Jul 2026
Next-12-month outlook: 170–208 installs (midpoint 189)
Trailing-12-month installs carried forward at half the observed growth rate (capped at ±30%), with a ±10% band. Not a forecast of permits or policy.
Growth & pricing
O Fallon by year
201 installs in the trailing twelve months vs 228 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in O Fallon
Summed across every zip in the city
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | CONTEMPORARY CONTRACTING | 58 | 27 | 1 | — |
| 2 | SUN SOLAR | 33 | 8 | 1 | — |
| 3 | FREEDOM FOREVER | 31 | 24 | 1 | — |
| 4 | LGCY POWER | 27 | 24 | 1 | — |
| 5 | MIDWEST SOLAR SOLUTIONS | 17 | 6 | 1 | — |
| 6 | GOODPWR | 16 | 14 | 1 | — |
| 7 | STRAIGHTUP SOLAR | 16 | 8 | 1 | — |
| 8 | GREEN GRIDS SOLAR | 13 | 13 | 1 | — |
| 9 | CR SOLAR | 12 | 11 | 1 | — |
| 10 | SUN SOLAR ILLINOIS | 10 | 0 | 1 | — |
| 11 | GRID | 9 | 1 | 1 | — |
| 12 | SOLARSHIPS INSTALLATION SERVICES | 8 | 8 | 1 | — |
Zip markets
Zips in O Fallon
Ranked by installations · click for the zip market
| Zip | Installs | $/W | Score |
|---|---|---|---|
| 62269 | 752 | — | 42 C |