| State Rank | County | Net Generation (Past Year) | Power Plants |
|---|
| #1 | Pottawattamie County, IA | 7.9 TWh | 2 |
| #2 | Louisa County, IA | 4.5 TWh | 2 |
| #3 | Marshall County, IA | 4.1 TWh | 7 |
| #4 | Adair County, IA | 4.0 TWh | 18 |
| #5 | Wapello County, IA | 3.5 TWh | 2 |
| #6 | Woodbury County, IA | 3.3 TWh | 3 |
| #7 | Cerro Gordo County, IA | 2.8 TWh | 7 |
| #8 | Polk County, IA | 2.0 TWh | 9 |
| #9 | Poweshiek County, IA | 1.9 TWh | 10 |
| #10 | O'Brien County, IA | 1.8 TWh | 3 |
| #11 | Ida County, IA | 1.8 TWh | 2 |
| #12 | Cass County, IA | 1.6 TWh | 6 |
| #13 | Mitchell County, IA | 1.5 TWh | 7 |
| #14 | Hancock County, IA | 1.5 TWh | 3 |
| #15 | Palo Alto County, IA | 1.5 TWh | 5 |
| #16 | Kossuth County, IA | 1.5 TWh | 9 |
| #17 | Lee County, IA | 1.5 TWh | 4 |
| #18 | Linn County, IA | 1.4 TWh | 24 |
| #19 | Audubon County, IA | 1.4 TWh | 3 |
| #20 | Franklin County, IA | 1.4 TWh | 6 |
| #21 | Hamilton County, IA | 1.3 TWh | 4 |
| #22 | Pocahontas County, IA | 1.3 TWh | 4 |
| #23 | Boone County, IA | 1.2 TWh | 4 |
| #24 | Winnebago County, IA | 1.1 TWh | 7 |
| #25 | Clay County, IA | 1.1 TWh | 3 |
| #26 | Union County, IA | 1.0 TWh | 4 |
| #27 | Story County, IA | 997.9 GWh | 18 |
| #28 | Carroll County, IA | 994.4 GWh | 5 |
| #29 | Iowa County, IA | 843.6 GWh | 4 |
| #30 | Guthrie County, IA | 819.7 GWh | 3 |
| #31 | Cherokee County, IA | 815.3 GWh | 1 |
| #32 | Sac County, IA | 815.2 GWh | 2 |
| #33 | Webster County, IA | 812.7 GWh | 5 |
| #34 | Plymouth County, IA | 758.6 GWh | 1 |
| #35 | Buena Vista County, IA | 748.0 GWh | 5 |
| #36 | Muscatine County, IA | 714.4 GWh | 6 |
| #37 | Clinton County, IA | 698.7 GWh | 6 |
| #38 | Adams County, IA | 642.5 GWh | 4 |
| #39 | Chickasaw County, IA | 640.9 GWh | 2 |
| #40 | Grundy County, IA | 626.5 GWh | 4 |
| #41 | Osceola County, IA | 619.1 GWh | 8 |
| #42 | Worth County, IA | 617.4 GWh | 7 |
| #43 | Mahaska County, IA | 606.3 GWh | 1 |
| #44 | Howard County, IA | 539.0 GWh | 3 |
| #45 | Tama County, IA | 431.2 GWh | 6 |
| #46 | Page County, IA | 405.2 GWh | 2 |
| #47 | Dickinson County, IA | 403.0 GWh | 5 |
| #48 | Delaware County, IA | 402.8 GWh | 5 |
| #49 | Taylor County, IA | 352.9 GWh | 4 |
| #50 | Hardin County, IA | 331.0 GWh | 3 |
| #51 | Floyd County, IA | 270.3 GWh | 3 |
| #52 | Crawford County, IA | 263.0 GWh | 3 |
| #53 | Madison County, IA | 248.7 GWh | 2 |
| #54 | Greene County, IA | 221.5 GWh | 5 |
| #55 | Marion County, IA | 203.2 GWh | 5 |
| #56 | Bremer County, IA | 174.4 GWh | 6 |
| #57 | Monroe County, IA | 112.1 GWh | 1 |
| #58 | Black Hawk County, IA | 64.8 GWh | 9 |
| #59 | Des Moines County, IA | 35.0 GWh | 2 |
| #60 | Appanoose County, IA | 26.0 GWh | 2 |
| #61 | Johnson County, IA | 8.3 GWh | 5 |
| #62 | Dubuque County, IA | 6.5 GWh | 6 |
| #63 | Scott County, IA | 6.4 GWh | 3 |
| #64 | Henry County, IA | 5.8 GWh | 3 |
| #65 | Jackson County, IA | 5.8 GWh | 5 |
| #66 | Winneshiek County, IA | 4.6 GWh | 3 |
| #67 | Lucas County, IA | 4.3 GWh | 1 |
| #68 | Clayton County, IA | 2.2 GWh | 4 |
| #69 | Davis County, IA | 1.9 GWh | 2 |
| #70 | Dallas County, IA | 1.9 GWh | 1 |
| #71 | Emmet County, IA | 577.0 MWh | 2 |
| #72 | Cedar County, IA | 295.4 MWh | 4 |
| #73 | Decatur County, IA | 45.0 MWh | 1 |
| #74 | Allamakee County, IA | 30.4 MWh | 3 |
| #75 | Montgomery County, IA | 22.0 MWh | 1 |
| #76 | Lyon County, IA | 20.0 MWh | 1 |
| #77 | Shelby County, IA | 1.0 MWh | 1 |
Net Generation data is based on the last 12 months since Dec 2025
