Winnebago County, IL solar installation & market data
Updated October 1, 2026 By The SolarDNA Data Team
Winnebago County has 4,063 solar installations across 20 zip codes, installations down 15.8% over the trailing twelve months, and an installs-weighted Market Score of 42.
Active installations
4,063
Zip markets
20
Median cost
—
12-mo growth
▼ 15.8%
Installers active
64
County Market Score
Good · installs-weighted across 20 zips
Best zip in Winnebago County scores higher than 81% of U.S. zip markets.
Versus Illinois
How Winnebago County compares with the state
Installed cost
—
state median $6.56/W
Market score
42 vs 43
Illinois scores 43
Share of state installs
3.60%
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: 477–583 installs (midpoint 530)
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
Winnebago County by year
576 installs in the trailing twelve months vs 684 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in Winnebago County
Summed across every zip in the county
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | SUNRUN | 374 | 173 | 14 | — |
| 2 | ICONIC ENERGY | 169 | 61 | 17 | — |
| 3 | BRIGHT PLANET SOLAR | 115 | 82 | 13 | — |
| 4 | FREEDOM FOREVER | 101 | 57 | 16 | — |
| 5 | GREENLINK SOLAR SOLUTIONS | 36 | 13 | 11 | — |
| 6 | SUNPOWER | 30 | 30 | 11 | — |
| 7 | TRON SOLAR | 23 | 17 | 12 | — |
| 8 | CR SOLAR | 21 | 16 | 9 | — |
| 9 | VIVINT SOLAR DEVELOPER | 20 | 1 | 9 | — |
| 10 | LGCY POWER | 16 | 12 | 9 | — |
| 11 | ION SOLAR | 14 | 14 | 8 | — |
| 12 | STATELINE SOLAR | 14 | 4 | 5 | — |
| 13 | CR SOLAR LIMITED LIABILITY COMPANY | 9 | 9 | 5 | — |
| 14 | LEGACY SOLAR | 9 | 8 | 5 | — |
| 15 | TRUHOME PROS | 7 | 3 | 5 | — |
| 16 | AMBIA ENERGY | 7 | 6 | 4 | — |
| 17 | TESLA | 6 | 2 | 6 | — |
| 18 | APTIVE SOLAR DBA AMBIA ENERGY | 6 | 6 | 4 | — |
| 19 | REVOLUTION ENERGY SYSTEMS | 5 | 5 | 4 | — |
| 20 | WILSON ELECTRIC | 4 | 0 | 1 | — |
| 21 | ADT SOLAR | 3 | 1 | 2 | — |
| 22 | BRIGHT OPS | 3 | 3 | 3 | — |
| 23 | CERTASUN | 3 | 2 | 3 | — |
| 24 | PALMETTO SOLAR | 3 | 3 | 3 | — |
| 25 | SIGE ELECTRIC | 3 | 1 | 3 | — |
Zip markets
Zips in Winnebago County
Ranked by installations · click for the zip market
| Zip | Installs | $/W | Score |
|---|---|---|---|
| 61115 | 569 | — | 48 B |
| 61073 | 461 | — | 38 D |
| 61109 | 455 | — | 40 C |
| 61108 | 341 | — | 38 D |
| 61107 | 325 | — | 43 C |
| 61111 | 317 | — | 43 C |
| 61114 | 278 | — | 42 C |
| 61103 | 227 | — | 42 C |
| 61102 | 221 | — | 42 C |
| 61101 | 178 | — | 42 C |
| 61088 | 176 | — | 42 C |
| 61063 | 120 | — | 42 C |
| 61016 | 107 | — | 42 C |
| 61024 | 84 | — | 41 C |
| 61072 | 81 | — | 41 C |
| 61104 | 81 | — | 41 C |
| 61080 | 37 | — | 41 C |
| 61079 | 2 | — | 41 C |
| 61112 | 2 | — | 41 C |
| 61077 | 1 | — | 41 C |