Knox County, IL solar installation & market data
Updated October 1, 2026 By The SolarDNA Data Team
Knox County has 613 solar installations across 16 zip codes, installations down 15.0% over the trailing twelve months, and an installs-weighted Market Score of 40.
Active installations
613
Zip markets
16
Median cost
—
12-mo growth
▼ 15.0%
Installers active
55
County Market Score
Good · installs-weighted across 16 zips
Best zip in Knox County scores higher than 45% of U.S. zip markets.
Versus Illinois
How Knox County compares with the state
Installed cost
—
state median $6.56/W
Market score
40 vs 43
Illinois scores 43
Share of state installs
0.54%
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: 122–150 installs (midpoint 136)
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
Knox County by year
147 installs in the trailing twelve months vs 173 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in Knox County
Summed across every zip in the county
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | SUNRUN | 65 | 26 | 12 | — |
| 2 | FREEDOM FOREVER | 41 | 27 | 8 | — |
| 3 | CR SOLAR | 20 | 18 | 7 | — |
| 4 | LGCY POWER | 12 | 8 | 4 | — |
| 5 | KAISER ELECTRIC CONTRACTORS | 12 | 3 | 6 | — |
| 6 | LEGACY SOLAR | 9 | 8 | 7 | — |
| 7 | ADVANCED RENEWABLE CONCEPTS | 8 | 2 | 2 | — |
| 8 | OFF GRID BLUE SKY SMART SOLUTIONS | 7 | 0 | 2 | — |
| 9 | ONE EARTH SOLAR | 6 | 6 | 4 | — |
| 10 | ADT SOLAR | 5 | 1 | 3 | — |
| 11 | SUPPLIED ENERGY | 4 | 0 | 3 | — |
| 12 | OFF GRID ENERGY SOLUTIONS DBA AVEYO | 4 | 4 | 4 | — |
| 13 | OBERLANDER ELECTRIC | 4 | 1 | 3 | — |
| 14 | EAGLE POINT SOLAR | 3 | 0 | 1 | — |
| 15 | REVOLUTION ENERGY SYSTEMS | 3 | 1 | 3 | — |
| 16 | PORTER ELECTRIC | 3 | 0 | 2 | — |
| 17 | ATLAS TOTAL HOME | 3 | 1 | 3 | — |
| 18 | OASIS WORLD SOLUTIONS | 2 | 1 | 2 | — |
| 19 | KAISER ELECTRIC | 2 | 0 | 2 | — |
| 20 | 360 ELECTRIC | 2 | 2 | 1 | — |
| 21 | REFICIENCY | 2 | 2 | 2 | — |
| 22 | EMPWR SOLAR LLP | 2 | 2 | 1 | — |
| 23 | SUN SOLAR | 2 | 0 | 2 | — |
| 24 | ROUTE 66 SOLAR | 2 | 0 | 2 | — |
| 25 | CLEAN ENERGY DESIGN GROUP | 1 | 0 | 1 | — |