Power plants in Illinois

626 operating power projects with 52,000 MW of nameplate capacity, from EIA-860M for August 2026.

Projects

626

Nameplate capacity

52,000 MW

Counties with a plant

84

Operators

331

Power markets: PJM prices, MISO prices

Capacity by fuel

MW is nameplate from operating generators and batteries. Plant counts use each project's primary fuel, so a coal and gas plant counts once.

Largest power plants in Illinois

Top 50 · All 626 plants
PlantPrimary fuelMWCountyOperator
Braidwood Generation StationNuclear2,450WillConstellation Nuclear
Byron Generating StationNuclear2,450OgleConstellation Nuclear
LaSalle Generating StationNuclear2,340LaSalleConstellation Nuclear
Dresden Generating StationNuclear2,019GrundyConstellation Nuclear
Quad Cities Generating StationNuclear2,019Rock IslandConstellation Nuclear
PowertonCoal1,786TazewellMidwest Generations EME LLC
Prairie State Generating StationCoal1,766St ClairPrairie State Generating Co LLC
Kincaid Generation LLCCoal1,319ChristianDynegy Kincaid Generation
CPV Three Rivers Energy CenterNatural gas1,300GrundyCPV Three Rivers, LLC
Jackson Generation, LLCNatural gas1,289WillJackson Generation, LLC

Illinois power plants by fuel

Newest plants in Illinois

Ordered by the month the first generator began operating.

Counties with the most capacity

Largest operators in Illinois

Grouped by EIA operator name. Parent companies are not merged.

All 626 plants in Illinois, by county

Adams County 6 plants

Bureau County 15 plants

Carroll County 1 plant

Cass County 3 plants

Christian County 5 plants

Clark County 3 plants

Clay County 6 plants

Clinton County 11 plants

Coles County 3 plants

Cook County 37 plants

Crawford County 2 plants

Cumberland County 1 plant

DeKalb County 31 plants

DeWitt County 7 plants

Douglas County 2 plants

DuPage County 6 plants

Edgar County 2 plants

Fayette County 2 plants

Ford County 5 plants

Franklin County 1 plant

Grundy County 9 plants

Henderson County 1 plant

Henry County 8 plants

Jackson County 2 plants

Jasper County 2 plants

Jefferson County 1 plant

Jersey County 1 plant

Jo Daviess County 4 plants

Kane County 13 plants

Kankakee County 30 plants

Kendall County 5 plants

Knox County 8 plants

Lake County 5 plants

LaSalle County 20 plants

Lawrence County 3 plants

Lee County 13 plants

Livingston County 17 plants

Logan County 5 plants

Macon County 6 plants

Madison County 9 plants

Marion County 4 plants

Mason County 6 plants

McDonough County 6 plants

McHenry County 22 plants

McLean County 8 plants

Mercer County 2 plants

Monroe County 1 plant

Montgomery County 3 plants

Morgan County 7 plants

Moultrie County 1 plant

Ogle County 10 plants

Perry County 5 plants

Piatt County 4 plants

Pike County 2 plants

Pulaski County 1 plant

Putnam County 2 plants

Randolph County 7 plants

Richland County 1 plant

Rock Island County 3 plants

Saline County 2 plants

Sangamon County 7 plants

Scott County 1 plant

  • Alsey Natural gas · 173 MW

Shelby County 2 plants

Stark County 2 plants

Stephenson County 30 plants

Tazewell County 8 plants

Union County 1 plant

Warren County 1 plant

Washington County 1 plant

White County 3 plants

Whiteside County 19 plants

Will County 29 plants

Winnebago County 18 plants

Woodford County 1 plant

Questions about power plants in Illinois

How many power plants are in Illinois?

EIA-860M for August 2026 lists 626 operating power projects in Illinois, with 52,000 MW of nameplate capacity including batteries.

What is the largest power plant in Illinois?

Braidwood Generation Station in Will County, with 2,449.8 MW of nameplate capacity. The next largest is Byron Generating Station, with 2,449.8 MW.

How much of Illinois's capacity is nuclear?

12,415 MW, about 24% of nameplate capacity. 6 projects have nuclear as their primary fuel.

Source: EIA-860M August 2026, published 2026-09-24. Page updated 2026-10-04. Data sources