Grundy County, IL solar installation & market data
Updated September 23, 2026 By The SolarDNA Data Team
Grundy County has 653 solar installations across 9 zip codes, installations up 3.7% over the trailing twelve months, and an installs-weighted Market Score of 42.
Active installations
653
Zip markets
9
Median cost
—
12-mo growth
▲ 3.7%
Installers active
38
County Market Score
Good · installs-weighted across 9 zips
Best zip in Grundy County scores higher than 54% of U.S. zip markets.
Versus Illinois
How Grundy County compares with the state
Installed cost
—
state median $6.56/W
Market score
42 vs 43
Illinois scores 43
Share of state installs
0.58%
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: 104–127 installs (midpoint 115)
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
Grundy County by year
113 installs in the trailing twelve months vs 109 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in Grundy County
Summed across every zip in the county
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | SUNRUN | 69 | 37 | 5 | — |
| 2 | FREEDOM FOREVER | 26 | 15 | 5 | — |
| 3 | BRIGHT PLANET SOLAR | 10 | 7 | 4 | — |
| 4 | HARVEST ENERGY SOLUTIONS | 10 | 1 | 3 | — |
| 5 | LEGACY SOLAR | 8 | 6 | 4 | — |
| 6 | GREEN GRIDS SOLAR | 7 | 7 | 3 | — |
| 7 | SUNPOWER | 6 | 6 | 3 | — |
| 8 | TRON SOLAR | 5 | 3 | 4 | — |
| 9 | GREENGRIDS | 4 | 3 | 3 | — |
| 10 | ADT SOLAR | 4 | 0 | 3 | — |
| 11 | LGCY POWER | 3 | 1 | 1 | — |
| 12 | REVOLUTION ENERGY SYSTEMS | 3 | 2 | 3 | — |
| 13 | INDEPENDENCE RENEWABLE ENERGY | 2 | 0 | 2 | — |
| 14 | CERTASUN | 2 | 1 | 2 | — |
| 15 | AG TECHNOLOGIES | 2 | 0 | 2 | — |
| 16 | ION SOLAR | 2 | 2 | 2 | — |
| 17 | SOLARSHIPS INSTALLATION SERVICES | 2 | 2 | 2 | — |
| 18 | AILEY SOLAR ELECTRIC | 2 | 1 | 2 | — |
| 19 | QUALITY SOLAR | 2 | 2 | 2 | — |
| 20 | STRAIGHTUP SOLAR | 1 | 0 | 1 | — |
| 21 | 360 ELECTRIC | 1 | 1 | 1 | — |
| 22 | TRUHOME PROS | 1 | 0 | 1 | — |
| 23 | GRNE-NELNET | 1 | 0 | 1 | — |
| 24 | PREFERRED ELECTRIC CONSTRUCTION OF IL | 1 | 1 | 1 | — |
| 25 | LEHMANN ELECTRIC & DESIGN | 1 | 1 | 1 | — |