Alton, IL solar installation & market data
Updated September 23, 2026Provisional score · under 500 installs By The SolarDNA Data Team
Alton has 267 solar installations across 1 zip code, installations up 44.1% over the trailing twelve months, and an installs-weighted Market Score of 53.
Active installations
267
Zip markets
1
Median cost
—
12-mo growth
▲ 44.1%
Installers active
12
City Market Score
Excellent · installs-weighted across 1 zips
Best zip in Alton scores higher than 97% of U.S. zip markets.
Versus Illinois
How Alton compares with the state
Installed cost
—
state median $6.56/W
Market score
53 vs 43
Illinois scores 43
Share of state installs
0.24%
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: 96–130 installs (midpoint 113)
Trailing-12-month installs carried forward at half the observed growth rate (capped at ±30%), with a ±15% band. Not a forecast of permits or policy.
Growth & pricing
Alton by year
98 installs in the trailing twelve months vs 68 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in Alton
Summed across every zip in the city
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | LGCY POWER | 27 | 24 | 1 | — |
| 2 | FREEDOM FOREVER | 17 | 16 | 1 | — |
| 3 | CR SOLAR | 13 | 9 | 1 | — |
| 4 | AMBIA ENERGY | 10 | 10 | 1 | — |
| 5 | GOODPWR | 7 | 7 | 1 | — |
| 6 | ARF SOLAR | 7 | 2 | 1 | — |
| 7 | APTIVE SOLAR DBA AMBIA ENERGY | 6 | 6 | 1 | — |
| 8 | CONTEMPORARY CONTRACTING | 5 | 1 | 1 | — |
| 9 | SUN SOLAR | 5 | 1 | 1 | — |
| 10 | SOLARSHIPS INSTALLATION SERVICES | 4 | 4 | 1 | — |
| 11 | ROUTE 66 SOLAR | 4 | 1 | 1 | — |
| 12 | GREENGRIDS | 3 | 3 | 1 | — |
Zip markets
Zips in Alton
Ranked by installations · click for the zip market
| Zip | Installs | $/W | Score |
|---|---|---|---|
| 62002 | 267 | — | 53 A |