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2025 Illinois Power Outage Report

In 2025, the average Illinois customer went without power for about 2.5 hours — the 45th worst of any US state that year, below the state's decade average. Figures from DOE/ORNL EAGLE-I.

Avg hrs / customer
2.5
Peak customers out
63,645
Rank (worst state)
45th
Counties affected
20

Illinois outages over the decade

Average hours without power per customer, 2025 highlighted.

2.3h20151.5h20161.4h20172.5h20181.8h20195.9h20202.3h20211.6h20224.0h20233.0h20242.5h2025

Hardest-hit Illinois counties in 2025

By peak customers out during the year's worst event.

1Cook County63,6452DuPage County20,5303Kane County18,8704Madison County18,7315Rock Island County18,3066St. Clair County18,0627Will County14,9998McHenry County13,2509Morgan County11,73010Williamson County10,89411Monroe County9,15912Lake County8,58013Lee County8,24514Winnebago County8,09115Franklin County8,03316McLean County7,64717Saline County7,44418Boone County7,25419Macon County6,40520LaSalle County6,369

Biggest Illinois outages of 2025

CountyBeganPeak customers out
Cook CountyMay 11, 202563,645
Cook CountyAugust 7, 202544,656
Cook CountyJuly 21, 202529,730
DuPage CountyAugust 8, 202520,530
Kane CountyAugust 16, 202518,870
Madison CountyMay 15, 202518,731
Rock Island CountyJune 3, 202518,306
St. Clair CountyMarch 14, 202518,062
Will CountyAugust 16, 202514,999
DuPage CountyAugust 16, 202514,386
Illinois by year:20242023202220212020201920182017
Other states in 2025:WVMIAKPANCMO

Part of the 2025 US Power Outage Report. Source: DOE/ORNL EAGLE-I. “Avg hours per customer” is a SAIDI-like measure (outage customer-minutes ÷ tracked customers); coverage varies by year.