massoutage

2020 Illinois Power Outage Report

In 2020, the average Illinois customer went without power for about 5.9 hours — the 22nd worst of any US state that year, 2.2× the state's decade average. Figures from DOE/ORNL EAGLE-I.

Avg hrs / customer
5.9
Peak customers out
279,858
Rank (worst state)
22nd
Counties affected
20

Illinois outages over the decade

Average hours without power per customer, 2020 highlighted.

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

Hardest-hit Illinois counties in 2020

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

1Cook County279,8582Will County98,0243DuPage County64,5954Rock Island County56,7655LaSalle County30,0696Lake County28,9097Kankakee County26,7888Winnebago County24,4459McHenry County18,03710Whiteside County17,21811Kane County15,37612Ogle County12,84513Logan County12,59714Peoria County12,32715Clinton County12,24416DeKalb County10,58717Madison County10,33318Kendall County7,53019Bureau County7,25220Macon County7,108

Biggest Illinois outages of 2020

CountyBeganPeak customers out
Cook CountyAugust 5, 2020279,858
Will CountyAugust 10, 202098,024
DuPage CountyAugust 10, 202064,595
Rock Island CountyAugust 10, 202056,765
Cook CountyJune 8, 202031,346
LaSalle CountyAugust 10, 202030,069
Rock Island CountyJuly 12, 202029,421
Lake CountyAugust 10, 202028,909
Kankakee CountyAugust 10, 202026,788
Winnebago CountyAugust 10, 202024,445
Illinois by year:20252024202320222021201920182017
Other states in 2020:LAMEOKIAALNC

Part of the 2020 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.