Directory of Power Plants in Illinois
| County | State Rank | Active Plants | May 2026 Generation |
|---|
| Will County, IL | # 1 | 44 | 27.0 TWh |
| Grundy County, IL | # 2 | 12 | 22.3 TWh |
| Ogle County, IL | # 3 | 12 | 19.6 TWh |
| LaSalle County, IL | # 4 | 27 | 19.5 TWh |
| Rock Island County, IL | # 5 | 7 | 16.4 TWh |
| St. Clair County, IL | # 6 | 11 | 12.2 TWh |
| De Witt County, IL | # 7 | 5 | 8.9 TWh |
| Randolph County, IL | # 8 | 6 | 6.4 TWh |
| Lee County, IL | # 9 | 15 | 5.7 TWh |
| Kendall County, IL | # 10 | 7 | 5.5 TWh |
| Tazewell County, IL | # 11 | 12 | 3.5 TWh |
| Jasper County, IL | # 12 | 2 | 3.4 TWh |
| McLean County, IL | # 13 | 16 | 3.2 TWh |
| Sangamon County, IL | # 14 | 11 | 2.9 TWh |
| Shelby County, IL | # 15 | 3 | 2.8 TWh |
| Christian County, IL | # 16 | 7 | 2.4 TWh |
| Livingston County, IL | # 17 | 23 | 2.3 TWh |
| Bureau County, IL | # 18 | 19 | 2.3 TWh |
| Macon County, IL | # 19 | 9 | 2.0 TWh |
| Henry County, IL | # 20 | 11 | 1.8 TWh |
| Logan County, IL | # 21 | 7 | 1.6 TWh |
| Mason County, IL | # 22 | 6 | 1.3 TWh |
| Ford County, IL | # 23 | 5 | 1.3 TWh |
| Vermilion County, IL | # 24 | 13 | 1.1 TWh |
| Piatt County, IL | # 25 | 5 | 932.1 GWh |
| Williamson County, IL | # 26 | 11 | 817.1 GWh |
| Iroquois County, IL | # 27 | 4 | 794.3 GWh |
| Douglas County, IL | # 28 | 2 | 706.6 GWh |
| DeKalb County, IL | # 29 | 21 | 677.9 GWh |
| Kankakee County, IL | # 30 | 29 | 667.6 GWh |
| Woodford County, IL | # 31 | 3 | 622.9 GWh |
| White County, IL | # 32 | 5 | 603.4 GWh |
| DuPage County, IL | # 33 | 26 | 593.8 GWh |
| Stephenson County, IL | # 34 | 27 | 536.6 GWh |
| McDonough County, IL | # 35 | 6 | 533.5 GWh |
| Cook County, IL | # 36 | 82 | 516.9 GWh |
| Lake County, IL | # 37 | 9 | 506.0 GWh |
| Clay County, IL | # 38 | 7 | 504.9 GWh |
| Madison County, IL | # 39 | 12 | 483.7 GWh |
| Saline County, IL | # 40 | 3 | 457.8 GWh |
| Coles County, IL | # 41 | 4 | 421.3 GWh |
| Stark County, IL | # 42 | 2 | 411.5 GWh |
| Perry County, IL | # 43 | 6 | 403.7 GWh |
| County | State Rank | Active Plants | May 2026 Generation |
|---|
| Marshall County, IL | # 44 | 6 | 387.6 GWh |
| Morgan County, IL | # 45 | 8 | 378.6 GWh |
| Champaign County, IL | # 46 | 16 | 359.3 GWh |
| Clark County, IL | # 47 | 4 | 309.4 GWh |
| Cass County, IL | # 48 | 5 | 305.9 GWh |
| Jersey County, IL | # 49 | 1 | 254.8 GWh |
| Cumberland County, IL | # 50 | 1 | 234.8 GWh |
| Fayette County, IL | # 51 | 5 | 231.9 GWh |
| Winnebago County, IL | # 52 | 25 | 215.8 GWh |
| Fulton County, IL | # 53 | 4 | 182.9 GWh |
| Pike County, IL | # 54 | 5 | 150.2 GWh |
| Macoupin County, IL | # 55 | 9 | 144.1 GWh |
| Montgomery County, IL | # 56 | 6 | 92.6 GWh |
| Peoria County, IL | # 57 | 14 | 87.2 GWh |
| Warren County, IL | # 58 | 1 | 76.3 GWh |
| Kane County, IL | # 59 | 20 | 76.1 GWh |
| Whiteside County, IL | # 60 | 21 | 61.5 GWh |
| McHenry County, IL | # 61 | 24 | 58.5 GWh |
| Marion County, IL | # 62 | 4 | 50.3 GWh |
| Scott County, IL | # 63 | 1 | 34.7 GWh |
| Clinton County, IL | # 64 | 12 | 23.6 GWh |
| Knox County, IL | # 65 | 9 | 18.0 GWh |
| Mercer County, IL | # 66 | 3 | 16.0 GWh |
| Jackson County, IL | # 67 | 6 | 8.9 GWh |
| Pulaski County, IL | # 68 | 2 | 8.8 GWh |
| Boone County, IL | # 69 | 3 | 8.2 GWh |
| Jo Daviess County, IL | # 70 | 4 | 7.7 GWh |
| Putnam County, IL | # 71 | 3 | 7.6 GWh |
| Crawford County, IL | # 72 | 4 | 5.4 GWh |
| Edgar County, IL | # 73 | 2 | 4.9 GWh |
| Lawrence County, IL | # 74 | 1 | 4.7 GWh |
| Richland County, IL | # 75 | 2 | 4.4 GWh |
| Jefferson County, IL | # 76 | 3 | 4.3 GWh |
| Franklin County, IL | # 77 | 1 | 3.8 GWh |
| Carroll County, IL | # 78 | 1 | 2.8 GWh |
| Henderson County, IL | # 79 | 1 | 2.5 GWh |
| Adams County, IL | # 80 | 7 | 2.1 GWh |
| Monroe County, IL | # 81 | 2 | 751.0 MWh |
| Moultrie County, IL | # 82 | 1 | 462.0 MWh |
| Effingham County, IL | # 83 | 1 | 75.0 MWh |
| Hamilton County, IL | # 84 | 1 | 42.0 MWh |
| Brown County, IL | # 85 | 1 | 3.0 MWh |
