| State Rank | County | Net Generation (Past Year) | Power Plants |
|---|
| #34 | Cook County, IL | 472.0 GWh | 77 |
| #1 | Will County, IL | 28.6 TWh | 40 |
| #32 | Stephenson County, IL | 523.1 GWh | 26 |
| #35 | DuPage County, IL | 444.0 GWh | 25 |
| #48 | Winnebago County, IL | 187.2 GWh | 23 |
| #3 | LaSalle County, IL | 20.6 TWh | 20 |
| #59 | McHenry County, IL | 34.0 GWh | 19 |
| #29 | Kankakee County, IL | 665.4 GWh | 17 |
| #56 | Whiteside County, IL | 45.8 GWh | 17 |
| #28 | DeKalb County, IL | 677.5 GWh | 15 |
| #12 | McLean County, IL | 3.3 TWh | 14 |
| #53 | Kane County, IL | 69.8 GWh | 14 |
| #15 | Livingston County, IL | 2.4 TWh | 13 |
| #9 | Lee County, IL | 5.8 TWh | 12 |
| #43 | Champaign County, IL | 258.5 GWh | 12 |
| #4 | Ogle County, IL | 19.2 TWh | 12 |
| #2 | Grundy County, IL | 21.9 TWh | 10 |
| #16 | Sangamon County, IL | 2.4 TWh | 10 |
| #18 | Bureau County, IL | 2.2 TWh | 9 |
| #23 | Vermilion County, IL | 1.2 TWh | 9 |
| #13 | Tazewell County, IL | 3.2 TWh | 9 |
| #33 | Madison County, IL | 481.7 GWh | 9 |
| #38 | Lake County, IL | 398.2 GWh | 8 |
| #44 | Morgan County, IL | 251.6 GWh | 8 |
| #5 | Rock Island County, IL | 16.4 TWh | 7 |
| #52 | Peoria County, IL | 90.9 GWh | 7 |
| #6 | St. Clair County, IL | 11.4 TWh | 7 |
| #14 | Christian County, IL | 2.7 TWh | 7 |
| #47 | Clay County, IL | 216.7 GWh | 7 |
| #26 | Williamson County, IL | 746.0 GWh | 7 |
| #20 | Henry County, IL | 1.7 TWh | 6 |
| #21 | Logan County, IL | 1.5 TWh | 6 |
| #60 | Clinton County, IL | 11.4 GWh | 6 |
| #8 | Randolph County, IL | 6.7 TWh | 5 |
| #41 | Marshall County, IL | 348.8 GWh | 5 |
| #19 | Macon County, IL | 2.1 TWh | 5 |
| #31 | McDonough County, IL | 532.4 GWh | 5 |
| #7 | De Witt County, IL | 10.1 TWh | 4 |
| #22 | Mason County, IL | 1.3 TWh | 4 |
| #66 | Knox County, IL | 4.4 GWh | 4 |
| #49 | Cass County, IL | 115.7 GWh | 4 |
| #64 | Jo Daviess County, IL | 6.9 GWh | 4 |
| #54 | Pike County, IL | 67.5 GWh | 4 |
| #36 | White County, IL | 419.5 GWh | 4 |
| #39 | Coles County, IL | 362.8 GWh | 4 |
| #40 | Perry County, IL | 362.0 GWh | 3 |
| #71 | Putnam County, IL | 3.7 GWh | 3 |
| #17 | Shelby County, IL | 2.4 TWh | 3 |
| #30 | Woodford County, IL | 651.1 GWh | 3 |
| #68 | Marion County, IL | 4.2 GWh | 3 |
| #62 | Boone County, IL | 8.1 GWh | 3 |
| #61 | Macoupin County, IL | 10.4 GWh | 3 |
| #10 | Kendall County, IL | 5.2 TWh | 3 |
| #42 | Clark County, IL | 294.1 GWh | 3 |
| #45 | Fayette County, IL | 230.4 GWh | 3 |
| #24 | Ford County, IL | 1.1 TWh | 3 |
| #70 | Fulton County, IL | 3.8 GWh | 3 |
| #25 | Iroquois County, IL | 816.8 GWh | 3 |
| #58 | Montgomery County, IL | 34.7 GWh | 2 |
| #74 | Adams County, IL | 2.2 GWh | 2 |
| #27 | Douglas County, IL | 724.2 GWh | 2 |
| #76 | Monroe County, IL | 491.0 MWh | 2 |
| #63 | Jackson County, IL | 7.6 GWh | 2 |
| #11 | Jasper County, IL | 3.3 TWh | 2 |
| #46 | Piatt County, IL | 229.3 GWh | 2 |
| #67 | Jefferson County, IL | 4.3 GWh | 1 |
| #77 | Moultrie County, IL | 195.0 MWh | 1 |
| #75 | Brown County, IL | 1.3 GWh | 1 |
| #72 | Carroll County, IL | 3.0 GWh | 1 |
| #51 | Jersey County, IL | 113.3 GWh | 1 |
| #55 | Warren County, IL | 65.4 GWh | 1 |
| #78 | Effingham County, IL | 56.0 MWh | 1 |
| #65 | Richland County, IL | 4.4 GWh | 1 |
| #37 | Stark County, IL | 406.4 GWh | 1 |
| #69 | Franklin County, IL | 3.8 GWh | 1 |
| #57 | Scott County, IL | 38.7 GWh | 1 |
| #73 | Henderson County, IL | 2.8 GWh | 1 |
| #50 | Saline County, IL | 115.2 GWh | 1 |
Net Generation data is based on the last 12 months since May 2025
