DeKalb County, IL solar installation & market data
Updated September 24, 2026 By The SolarDNA Data Team
DeKalb County has 1,209 solar installations across 14 zip codes, installations down 7.4% over the trailing twelve months, and an installs-weighted Market Score of 42.
Active installations
1,209
Zip markets
14
Median cost
—
12-mo growth
▼ 7.4%
Installers active
57
County Market Score
Good · installs-weighted across 14 zips
Best zip in DeKalb County scores higher than 55% of U.S. zip markets.
Versus Illinois
How DeKalb County compares with the state
Installed cost
—
state median $6.56/W
Market score
42 vs 43
Illinois scores 43
Share of state installs
1.07%
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: 152–186 installs (midpoint 169)
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
DeKalb County by year
176 installs in the trailing twelve months vs 190 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in DeKalb County
Summed across every zip in the county
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | SUNRUN | 102 | 46 | 11 | — |
| 2 | FREEDOM FOREVER | 35 | 29 | 11 | — |
| 3 | BRIGHT PLANET SOLAR | 18 | 10 | 4 | — |
| 4 | ICONIC ENERGY | 13 | 6 | 6 | — |
| 5 | GREENLINK SOLAR SOLUTIONS | 9 | 1 | 3 | — |
| 6 | LGCY POWER | 8 | 5 | 5 | — |
| 7 | SUNPOWER | 8 | 8 | 5 | — |
| 8 | INDEPENDENCE RENEWABLE ENERGY | 8 | 5 | 4 | — |
| 9 | RETHINK ELECTRIC | 6 | 4 | 5 | — |
| 10 | ION SOLAR | 6 | 6 | 2 | — |
| 11 | STATELINE SOLAR | 5 | 2 | 5 | — |
| 12 | LEGACY SOLAR | 5 | 5 | 3 | — |
| 13 | CR SOLAR LIMITED LIABILITY COMPANY | 4 | 4 | 2 | — |
| 14 | ONE EARTH SOLAR | 4 | 3 | 4 | — |
| 15 | ION DEVELOPER | 3 | 1 | 2 | — |
| 16 | ALTHOFF INDUSTRIES | 3 | 3 | 2 | — |
| 17 | TRON SOLAR | 3 | 2 | 1 | — |
| 18 | TESLA | 3 | 1 | 2 | — |
| 19 | PALMETTO SOLAR | 3 | 1 | 2 | — |
| 20 | VIVINT SOLAR DEVELOPER | 3 | 1 | 2 | — |
| 21 | TRUHOME PROS | 2 | 1 | 2 | — |
| 22 | AMBIA ENERGY | 2 | 2 | 2 | — |
| 23 | GEM ENERGY | 2 | 2 | 1 | — |
| 24 | GENERAL ENERGY CORPORATION | 2 | 0 | 1 | — |
| 25 | SOURCE SOLAR | 2 | 1 | 2 | — |