Illinois has 212 solar farms in the EIA Form 860 database, with a combined installed capacity of 3,189 MW. Of those, 17 plants are utility-scale (50 MW or larger), including 3 mega-projects of 200 MW or more. The largest single facility is Double Back Diamond in Virden, Sangamon County — a 593 MW plant operated by Double Back Diamond Solar Power, LLC.
Use the interactive Illinois solar farms map below to explore every plant, color-coded by technology type and sized by capacity. Click any solar farm for its name, operator, capacity (MW), technology, and location — or view the full US solar farms interactive map to compare Illinois to every other state.
Type
Capacity
Illinois Solar Farms by the Numbers
- 212 total solar farms in Illinois (EIA Form 860 (US Energy Information Administration), latest reporting period)
- 3,189 MW total installed solar capacity
- 4 MW co-located battery storage capacity
- 17 utility-scale plants (50 MW or larger)
- 3 mega-projects rated 200 MW or larger
- 182 small / community-scale plants (under 5 MW)
Illinois Solar Farms by Technology Type
- 210 Solar Photovoltaic (PV) — standard panel installations, the dominant technology nationwide
- 2 Solar PV with Battery Storage — newer hybrid plants that pair panels with on-site batteries to store excess generation
The 15 Largest Solar Farms in Illinois
The largest solar farm in Illinois by installed capacity is Double Back Diamond at 593 MW. The 15 largest Illinois solar farms from the latest EIA filing:
| # | Solar Farm | Operator | Capacity | Location |
|---|---|---|---|---|
| 1 | Double Back Diamond | Double Back Diamond Solar Power, LLC | 593 MW | Virden, Sangamon |
| 2 | Maple Flats | Invenergy Services LLC | 250 MW | Louisville, Clay |
| 3 | Prairie Wolf Solar LLC | National Grid Renewables | 200 MW | Ashmore Township, Coles |
| 4 | River Ferry Solar 1 | River Ferry Solar 1, LLC | 172 MW | West Union, Clark |
| 5 | Eldorado Solar I | Sol Systems | 150 MW | Eldorado, Saline |
| 6 | Cass County Renewable Energy Center | Union Electric Co – (MO) | 150 MW | , |
| 7 | Boomtown Renewable Energy Center | Union Electric Co – (MO) | 150 MW | , |
| 8 | Big River Solar | Big River Solar, LLC | 149 MW | Norris City, White |
| 9 | Wolf Run Solar | Wolf Run Solar LLC | 140 MW | Chapin, Morgan |
| 10 | Hickory Solar | Hickory Solar LLC | 110 MW | Jerseyville, Jersey |
| 11 | High Point Solar LLC | Acciona Energy USA Global, LLC | 100 MW | Lena, Stephenson |
| 12 | Prairie State Solar Project | Prairie State Solar, LLC | 99 MW | Swanwick Township, Perry |
| 13 | Dressor Plains Solar, LLC | Dressor Plains Solar, LLC | 99 MW | Herrick, Fayette |
| 14 | Mulligan Solar, LLC | Mulligan Solar | 70 MW | Broadwell, Logan |
| 15 | Baldwin Solar BESS | Vistra Corp | 68 MW + 2 MW battery | Baldwin, Randolph |
Top Solar Operators in Illinois
Five operators account for the largest share of solar generation in Illinois:
- Double Back Diamond Solar Power, LLC — 1 plant, 593 MW total
- Union Electric Co – (MO) — 2 plants, 300 MW total
- Invenergy Services LLC — 2 plants, 270 MW total
- National Grid Renewables — 1 plant, 200 MW total
- Sol Systems — 2 plants, 180 MW total
Solar Permitting and Regulation in Illinois
Utility-scale solar in Illinois is overseen by the Illinois Commerce Commission. Wholesale market participation and interconnection are regulated by the Federal Energy Regulatory Commission (FERC) and the relevant ISO/RTO. All generators above 1 MW must report capacity, fuel type, and location to the EIA via Form 860 — the dataset used in this map.
Frequently Asked Questions
How many solar farms are in Illinois?
Illinois has 212 solar farms in the latest EIA Form 860 filing — a combined 3,189 MW of installed capacity. Of those, 17 are utility-scale (50 MW or larger).
What is the largest solar farm in Illinois?
The largest solar farm in Illinois is Double Back Diamond, located in Virden (Sangamon County), with 593 MW of installed capacity. It is operated by Double Back Diamond Solar Power, LLC.
How much solar capacity does Illinois have?
Illinois has 3,189 MW of installed solar capacity across 212 plants reporting to the EIA. This counts only the solar portion (Solar_MW field) — co-located batteries and other generation are reported separately.
Who regulates solar farms in Illinois?
Solar farms in Illinois are regulated by the Illinois Commerce Commission at the state level, with federal oversight from FERC. The EIA collects annual data on every utility-scale solar plant via Form 860.
View all 6,406 US solar farms on the national interactive map
