Solar installers in Williamson County
56 companies have installed solar on 681 homes here since 2023 that we know of (Illinois's records name the installer for only 0% of systems). Covers Marion, Herrin, Carterville, Johnston City, Cambria, Crainville and nearby towns.
Ranked by homes installed, which shows who’s active here, not who’s best. Prices are each company’s median for systems sold outright, shown when it sold at least 10.
Towns in Williamson County: Marion, Herrin, Carterville, Johnston City, Cambria, Crainville, Energy, Hurst, Pittsburg, Creal Springs, Freeman Spur, Bush.
Other Illinois counties
How much does solar cost in Williamson County, IL?
There weren't enough Williamson County systems bought outright for a county figure. Across the U.S., homes paid a median $4.10/W installed in 2023–2025, about $26,700 for a 6.5 kW system.
Which solar companies install in Williamson County, IL?
56 installers have put in home systems in Williamson County since 2023, the busiest being Advanced Energy Solutions Group, LGCY Installation Services, Residential Service Providers, CR Solar, Solarships Installation Services.
Installed prices and installers from public installation records: Lawrence Berkeley National Laboratory’s Tracking the Sun (systems installed through 2025) and state program files from California, New York, New Jersey, Connecticut, Illinois and Oregon, which run into 2026. Prices are in dollars per watt of panel capacity (DC), before rebates and tax credits, for homes that bought their system; leased systems and systems with batteries are left out.