| State Rank | County | (Past Year)">Net Generation (Past Year) | Power Plants |
|---|
| #66 | Adams County, IL | 2.8 GWh | 2 |
| #56 | Boone County, IL | 7.6 GWh | 2 |
| #64 | Brown County, IL | 3.3 GWh | 1 |
| #19 | Bureau County, IL | 2.1 TWh | 9 |
| #44 | Champaign County, IL | 279.2 GWh | 12 |
| #17 | Christian County, IL | 2.5 TWh | 5 |
| #49 | Clark County, IL | 74.0 GWh | 3 |
| #53 | Clay County, IL | 11.8 GWh | 6 |
| #54 | Clinton County, IL | 10.2 GWh | 4 |
| #38 | Coles County, IL | 405.7 GWh | 1 |
| #36 | Cook County, IL | 585.0 GWh | 57 |
| #7 | De Witt County, IL | 9.3 TWh | 4 |
| #32 | DeKalb County, IL | 708.6 GWh | 11 |
| #31 | Douglas County, IL | 765.9 GWh | 2 |
| #33 | DuPage County, IL | 628.8 GWh | 13 |
| #71 | Effingham County, IL | 95.5 MWh | 1 |
| #45 | Fayette County, IL | 257.3 GWh | 3 |
| #25 | Ford County, IL | 1.2 TWh | 3 |
| #60 | Franklin County, IL | 4.5 GWh | 1 |
| #63 | Fulton County, IL | 3.6 GWh | 2 |
| #3 | Grundy County, IL | 21.7 TWh | 8 |
| #65 | Henderson County, IL | 3.2 GWh | 1 |
| #22 | Henry County, IL | 1.6 TWh | 5 |
| #26 | Iroquois County, IL | 960.8 GWh | 3 |
| #58 | Jackson County, IL | 6.9 GWh | 2 |
| #12 | Jasper County, IL | 3.4 TWh | 2 |
| #61 | Jefferson County, IL | 4.2 GWh | 1 |
| #57 | Jo Daviess County, IL | 7.1 GWh | 2 |
| #47 | Kane County, IL | 103.5 GWh | 12 |
| #28 | Kankakee County, IL | 808.2 GWh | 14 |
| #9 | Kendall County, IL | 5.7 TWh | 2 |
| #39 | Lake County, IL | 400.6 GWh | 8 |
| #2 | LaSalle County, IL | 21.8 TWh | 15 |
| #11 | Lee County, IL | 5.1 TWh | 12 |
| #16 | Livingston County, IL | 2.7 TWh | 9 |
| #23 | Logan County, IL | 1.6 TWh | 6 |
| #18 | Macon County, IL | 2.4 TWh | 5 |
| #55 | Macoupin County, IL | 9.1 GWh | 2 |
| #34 | Madison County, IL | 599.9 GWh | 8 |
| #70 | Marion County, IL | 224.0 MWh | 1 |
| #41 | Marshall County, IL | 360.5 GWh | 4 |
| #27 | Mason County, IL | 836.0 GWh | 4 |
| #10 | Massac County, IL | 5.6 TWh | 2 |
| #35 | McDonough County, IL | 596.4 GWh | 4 |
| #50 | McHenry County, IL | 36.2 GWh | 11 |
| #13 | McLean County, IL | 3.3 TWh | 12 |
| #67 | Monroe County, IL | 681.3 MWh | 2 |
| #51 | Morgan County, IL | 29.2 GWh | 7 |
| #69 | Moultrie County, IL | 241.0 MWh | 1 |
| #4 | Ogle County, IL | 21.2 TWh | 10 |
| #14 | Peoria County, IL | 3.0 TWh | 7 |
| #43 | Perry County, IL | 281.5 GWh | 3 |
| #68 | Piatt County, IL | 568.3 MWh | 1 |
| #62 | Pike County, IL | 4.0 GWh | 4 |
| #8 | Randolph County, IL | 6.4 TWh | 2 |
| #59 | Richland County, IL | 4.6 GWh | 1 |
| #5 | Rock Island County, IL | 17.0 TWh | 7 |
| #21 | Sangamon County, IL | 1.8 TWh | 10 |
| #48 | Scott County, IL | 81.6 GWh | 1 |
| #15 | Shelby County, IL | 2.8 TWh | 3 |
| #6 | St. Clair County, IL | 13.6 TWh | 5 |
| #37 | Stark County, IL | 499.0 GWh | 1 |
| #40 | Stephenson County, IL | 399.7 GWh | 15 |
| #20 | Tazewell County, IL | 1.9 TWh | 7 |
| #24 | Vermilion County, IL | 1.2 TWh | 9 |
| #42 | White County, IL | 359.5 GWh | 2 |
| #52 | Whiteside County, IL | 27.7 GWh | 8 |
| #1 | Will County, IL | 32.8 TWh | 28 |
| #29 | Williamson County, IL | 787.8 GWh | 6 |
| #46 | Winnebago County, IL | 221.0 GWh | 15 |
| #30 | Woodford County, IL | 768.4 GWh | 3 |
Net Generation data is based on the last 12 months since Dec 2022
