Jefferson County, IL solar installation & market data
Updated October 1, 2026Provisional score · under 500 installs By The SolarDNA Data Team
Jefferson County has 223 solar installations across 11 zip codes, installations up 176.7% over the trailing twelve months, and an installs-weighted Market Score of 41.
Active installations
223
Zip markets
11
Median cost
—
12-mo growth
▲ 176.7%
Installers active
28
County Market Score
Good · installs-weighted across 11 zips
Best zip in Jefferson County scores higher than 47% of U.S. zip markets.
Versus Illinois
How Jefferson County compares with the state
Installed cost
—
state median $6.56/W
Market score
41 vs 43
Illinois scores 43
Share of state installs
0.20%
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: 81–109 installs (midpoint 95)
Trailing-12-month installs carried forward at half the observed growth rate (capped at ±30%), with a ±15% band. Not a forecast of permits or policy.
Growth & pricing
Jefferson County by year
83 installs in the trailing twelve months vs 30 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in Jefferson County
Summed across every zip in the county
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | SOLARSHIPS INSTALLATION SERVICES | 17 | 17 | 4 | — |
| 2 | LGCY POWER | 14 | 14 | 4 | — |
| 3 | SUN SOLAR | 13 | 5 | 6 | — |
| 4 | FREEDOM FOREVER | 9 | 6 | 2 | — |
| 5 | SUNVOLT SOLAR | 7 | 5 | 2 | — |
| 6 | CR SOLAR | 7 | 7 | 4 | — |
| 7 | STRAIGHTUP SOLAR | 4 | 3 | 2 | — |
| 8 | AMBIA ENERGY | 4 | 4 | 1 | — |
| 9 | WOLFPACK ELECTRIC | 3 | 3 | 3 | — |
| 10 | CORVUS PRO SOLAR LLP | 3 | 2 | 1 | — |
| 11 | CONTEMPORARY CONTRACTING | 2 | 1 | 2 | — |
| 12 | MARTIN SOLAR | 2 | 2 | 1 | — |
| 13 | ADVANCED ENERGY SOLUTIONS GROUP | 2 | 1 | 2 | — |
| 14 | SOLAR ENERGY SOLUTIONS | 1 | 1 | 1 | — |
| 15 | FOWLER HEATING AND COOLING | 1 | 0 | 1 | — |
| 16 | SPARC SOLAR | 1 | 1 | 1 | — |
| 17 | AVEYO OFF GRID ENERGY SOLUTIONS | 1 | 1 | 1 | — |
| 18 | TITAN SOLAR POWER | 1 | 0 | 1 | — |
| 19 | MISSOURI SUN SOLAR | 1 | 0 | 1 | — |
| 20 | OFF GRID ENERGY SOLUTIONS DBA AVEYO | 1 | 1 | 1 | — |
| 21 | ABSOLUTE CLIMATE D B A C H ELECTRIC | 1 | 0 | 1 | — |
| 22 | PALS ELECTRIC | 1 | 1 | 1 | — |
| 23 | WELLSPRING COMPONENTS | 1 | 1 | 1 | — |
| 24 | STRAIGHT UP SOLAR | 1 | 0 | 1 | — |
| 25 | RESIDENTIAL SERVICE PROVIDERS | 1 | 0 | 1 | — |