| State Rank | County | Net Generation (Past Year) | Power Plants |
|---|
| #29 | Cook County, IL | 618.6 GWh | 60 |
| #1 | Will County, IL | 28.3 TWh | 33 |
| #34 | Stephenson County, IL | 483.6 GWh | 26 |
| #45 | Winnebago County, IL | 192.6 GWh | 20 |
| #3 | LaSalle County, IL | 20.5 TWh | 17 |
| #51 | McHenry County, IL | 33.2 GWh | 17 |
| #30 | Kankakee County, IL | 617.0 GWh | 15 |
| #52 | Whiteside County, IL | 32.2 GWh | 15 |
| #11 | McLean County, IL | 3.2 TWh | 14 |
| #28 | DeKalb County, IL | 660.2 GWh | 14 |
| #35 | DuPage County, IL | 467.8 GWh | 13 |
| #47 | Kane County, IL | 75.4 GWh | 13 |
| #15 | Livingston County, IL | 2.4 TWh | 12 |
| #43 | Champaign County, IL | 281.1 GWh | 12 |
| #9 | Lee County, IL | 5.2 TWh | 12 |
| #4 | Ogle County, IL | 19.9 TWh | 11 |
| #2 | Grundy County, IL | 22.4 TWh | 10 |
| #19 | Sangamon County, IL | 1.8 TWh | 10 |
| #24 | Vermilion County, IL | 1.2 TWh | 9 |
| #17 | Bureau County, IL | 2.1 TWh | 9 |
| #33 | Madison County, IL | 503.4 GWh | 9 |
| #38 | Lake County, IL | 345.0 GWh | 8 |
| #46 | Morgan County, IL | 121.3 GWh | 8 |
| #5 | Rock Island County, IL | 16.3 TWh | 7 |
| #13 | Tazewell County, IL | 2.7 TWh | 7 |
| #25 | Williamson County, IL | 761.7 GWh | 7 |
| #50 | Peoria County, IL | 35.3 GWh | 7 |
| #21 | Logan County, IL | 1.5 TWh | 6 |
| #20 | Henry County, IL | 1.6 TWh | 6 |
| #6 | St. Clair County, IL | 11.3 TWh | 6 |
| #57 | Clinton County, IL | 9.1 GWh | 6 |
| #48 | Clay County, IL | 51.1 GWh | 6 |
| #16 | Christian County, IL | 2.4 TWh | 6 |
| #8 | Randolph County, IL | 6.5 TWh | 5 |
| #18 | Macon County, IL | 2.0 TWh | 5 |
| #32 | McDonough County, IL | 551.1 GWh | 5 |
| #71 | Pike County, IL | 1.7 GWh | 4 |
| #72 | Knox County, IL | 1.6 GWh | 4 |
| #7 | De Witt County, IL | 10.2 TWh | 4 |
| #40 | Marshall County, IL | 317.2 GWh | 4 |
| #22 | Mason County, IL | 1.3 TWh | 4 |
| #41 | Perry County, IL | 303.8 GWh | 3 |
| #31 | Woodford County, IL | 580.4 GWh | 3 |
| #14 | Shelby County, IL | 2.7 TWh | 3 |
| #58 | Boone County, IL | 7.9 GWh | 3 |
| #42 | Clark County, IL | 296.2 GWh | 3 |
| #44 | Fayette County, IL | 237.2 GWh | 3 |
| #23 | Ford County, IL | 1.2 TWh | 3 |
| #27 | Iroquois County, IL | 759.3 GWh | 3 |
| #56 | Macoupin County, IL | 10.5 GWh | 2 |
| #70 | Adams County, IL | 2.4 GWh | 2 |
| #36 | Coles County, IL | 375.5 GWh | 2 |
| #39 | White County, IL | 334.5 GWh | 2 |
| #26 | Douglas County, IL | 761.0 GWh | 2 |
| #66 | Fulton County, IL | 3.6 GWh | 2 |
| #55 | Piatt County, IL | 12.4 GWh | 2 |
| #62 | Jackson County, IL | 5.8 GWh | 2 |
| #10 | Kendall County, IL | 4.9 TWh | 2 |
| #12 | Jasper County, IL | 2.8 TWh | 2 |
| #73 | Monroe County, IL | 462.0 MWh | 2 |
| #61 | Montgomery County, IL | 6.6 GWh | 2 |
| #60 | Jo Daviess County, IL | 6.9 GWh | 2 |
| #67 | Marion County, IL | 3.2 GWh | 1 |
| #69 | Brown County, IL | 2.6 GWh | 1 |
| #49 | Warren County, IL | 39.0 GWh | 1 |
| #74 | Moultrie County, IL | 208.0 MWh | 1 |
| #75 | Effingham County, IL | 80.0 MWh | 1 |
| #53 | Jersey County, IL | 26.2 GWh | 1 |
| #37 | Stark County, IL | 363.5 GWh | 1 |
| #64 | Jefferson County, IL | 3.9 GWh | 1 |
| #65 | Franklin County, IL | 3.8 GWh | 1 |
| #54 | Scott County, IL | 20.1 GWh | 1 |
| #59 | Saline County, IL | 7.1 GWh | 1 |
| #68 | Henderson County, IL | 2.8 GWh | 1 |
| #63 | Richland County, IL | 4.5 GWh | 1 |
Net Generation data is based on the last 12 months since Dec 2023
