Joliet, IL solar installation & market data
Updated September 23, 2026 By The SolarDNA Data Team
Joliet has 1,208 solar installations across 5 zip codes, installations down 14.9% over the trailing twelve months, and an installs-weighted Market Score of 42.
Active installations
1,208
Zip markets
5
Median cost
—
12-mo growth
▼ 14.9%
Installers active
44
City Market Score
Good · installs-weighted across 5 zips
Best zip in Joliet scores higher than 58% of U.S. zip markets.
Versus Illinois
How Joliet 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: 139–169 installs (midpoint 154)
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
Joliet by year
166 installs in the trailing twelve months vs 195 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in Joliet
Summed across every zip in the city
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | SUNRUN | 145 | 74 | 5 | — |
| 2 | FREEDOM FOREVER | 34 | 16 | 5 | — |
| 3 | BRIGHT PLANET SOLAR | 28 | 20 | 5 | — |
| 4 | LGCY POWER | 7 | 7 | 4 | — |
| 5 | TRON SOLAR | 5 | 4 | 2 | — |
| 6 | NATIONAL SOLAR SERVICE | 5 | 0 | 3 | — |
| 7 | GREENGRIDS | 4 | 4 | 3 | — |
| 8 | BLUE RAVEN SOLAR | 4 | 0 | 3 | — |
| 9 | GREEN GRIDS SOLAR | 4 | 4 | 2 | — |
| 10 | SUNPOWER | 4 | 4 | 3 | — |
| 11 | SPARC SOLAR | 4 | 4 | 4 | — |
| 12 | CR SOLAR | 3 | 1 | 1 | — |
| 13 | GOODPWR | 3 | 3 | 3 | — |
| 14 | WOLFPACK ELECTRIC | 3 | 3 | 1 | — |
| 15 | BRS FIELD OPS | 3 | 2 | 2 | — |
| 16 | EMPWR SOLAR LLP | 3 | 3 | 3 | — |
| 17 | VIVINT SOLAR DEVELOPER | 3 | 1 | 2 | — |
| 18 | TRUHOME PROS | 2 | 1 | 1 | — |
| 19 | RETHINK ELECTRIC | 2 | 0 | 1 | — |
| 20 | CERTASUN | 2 | 1 | 2 | — |
| 21 | SUNRISE SOLAR IL | 2 | 2 | 1 | — |
| 22 | ION SOLAR | 2 | 2 | 2 | — |
| 23 | TITAN SOLAR POWER | 2 | 1 | 1 | — |
| 24 | SIGE ELECTRIC | 2 | 0 | 1 | — |
| 25 | STRAIGHTUP SOLAR | 2 | 0 | 1 | — |