St. Clair County, IL solar installation & market data
Updated October 1, 2026 By The SolarDNA Data Team
St. Clair County has 2,915 solar installations across 27 zip codes, installations up 11.1% over the trailing twelve months, and an installs-weighted Market Score of 43.
Active installations
2,915
Zip markets
27
Median cost
—
12-mo growth
▲ 11.1%
Installers active
126
County Market Score
Good · installs-weighted across 27 zips
Best zip in St. Clair County scores higher than 98% of U.S. zip markets.
Versus Illinois
How St. Clair County compares with the state
Installed cost
—
state median $6.56/W
Market score
43 vs 43
Illinois scores 43
Share of state installs
2.59%
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: 797–975 installs (midpoint 886)
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
St. Clair County by year
839 installs in the trailing twelve months vs 755 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in St. Clair County
Summed across every zip in the county
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | GOODPWR | 128 | 123 | 15 | — |
| 2 | FREEDOM FOREVER | 124 | 87 | 18 | — |
| 3 | SUN SOLAR | 117 | 38 | 16 | — |
| 4 | LGCY POWER | 109 | 92 | 15 | — |
| 5 | CONTEMPORARY CONTRACTING | 101 | 43 | 12 | — |
| 6 | GREEN GRIDS SOLAR | 50 | 50 | 9 | — |
| 7 | CR SOLAR | 49 | 42 | 14 | — |
| 8 | STRAIGHTUP SOLAR | 41 | 23 | 11 | — |
| 9 | MIDWEST SOLAR SOLUTIONS | 33 | 12 | 8 | — |
| 10 | ADVANCED RENEWABLE CONCEPTS | 28 | 15 | 6 | — |
| 11 | SOLARSHIPS INSTALLATION SERVICES | 28 | 26 | 12 | — |
| 12 | JESSCO ENTERPRISES | 27 | 10 | 8 | — |
| 13 | AMBIA ENERGY | 24 | 24 | 7 | — |
| 14 | SUN SOLAR ILLINOIS | 24 | 1 | 9 | — |
| 15 | OFF GRID BLUE SKY SMART SOLUTIONS | 20 | 3 | 6 | — |
| 16 | CORVUS PRO SOLAR LLP | 19 | 14 | 11 | — |
| 17 | ASTRAWATT SOLAR | 18 | 6 | 8 | — |
| 18 | GRID | 18 | 4 | 6 | — |
| 19 | MARTIN SOLAR | 18 | 7 | 8 | — |
| 20 | SOLAR CITY STL | 15 | 14 | 6 | — |
| 21 | HELIO SOLAR POWER | 14 | 0 | 9 | — |
| 22 | QUALITY SOLAR | 13 | 13 | 3 | — |
| 23 | REVOLUTION ENERGY SYSTEMS | 13 | 8 | 7 | — |
| 24 | SOURCE SOLAR | 12 | 10 | 3 | — |
| 25 | ROUTE 66 SOLAR | 12 | 1 | 6 | — |
Zip markets
Zips in St. Clair County
Ranked by installations · click for the zip market
| Zip | Installs | $/W | Score |
|---|---|---|---|
| 62269 | 752 | — | 42 C |
| 62221 | 521 | — | 40 C |
| 62226 | 280 | — | 55 A |
| 62220 | 169 | — | 42 C |
| 62223 | 165 | — | 49 B |
| 62208 | 155 | — | 42 C |
| 62254 | 139 | — | 42 C |
| 62232 | 95 | — | 41 C |
| 62258 | 93 | — | 41 C |
| 62260 | 81 | — | 41 C |
| 62243 | 68 | — | 41 C |
| 62206 | 55 | — | 41 C |
| 62285 | 48 | — | 41 C |
| 62239 | 47 | — | 41 C |
| 62257 | 36 | — | 41 C |
| 62205 | 35 | — | 41 C |
| 62264 | 33 | — | 41 C |
| 62203 | 27 | — | 41 C |
| 62204 | 23 | — | 41 C |
| 62207 | 23 | — | 41 C |
| 62201 | 18 | — | 41 C |
| 62255 | 15 | — | 41 C |
| 62240 | 15 | — | 41 C |
| 62289 | 11 | — | 41 C |
| 62282 | 7 | — | 41 C |
| 62225 | 3 | — | 41 C |
| 62222 | 1 | — | 41 C |