massoutage

2023 Illinois Power Outage Report

In 2023, the average Illinois customer went without power for about 4.0 hours — the 27th worst of any US state that year, 1.5× the state's decade average. Figures from DOE/ORNL EAGLE-I.

Avg hrs / customer
4.0
Peak customers out
48,681
Rank (worst state)
27th
Counties affected
20

Illinois outages over the decade

Average hours without power per customer, 2023 highlighted.

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

Hardest-hit Illinois counties in 2023

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

1Sangamon County48,6812McHenry County36,1093Vermilion County32,6884Champaign County30,5485Winnebago County23,6356Cook County23,4377Macon County19,9968Kane County19,8339Madison County18,53910Rock Island County18,51911Lake County14,71912DuPage County14,33413St. Clair County13,15614Christian County9,97115Edgar County9,57516Lee County9,50517Coles County9,39018Douglas County8,94219Crawford County8,58320Will County8,303

Biggest Illinois outages of 2023

CountyBeganPeak customers out
Sangamon CountyJune 29, 202348,681
McHenry CountyFebruary 22, 202336,109
Vermilion CountyJune 29, 202332,688
Champaign CountyJune 29, 202330,548
Winnebago CountyFebruary 22, 202323,635
Cook CountyFebruary 22, 202323,437
Cook CountyJuly 17, 202321,521
Macon CountyJune 29, 202319,996
Kane CountyFebruary 22, 202319,833
Madison CountyJuly 1, 202318,539
Illinois by year:20252024202220212020201920182017
Other states in 2023:MEMIKYOKARWV

Part of the 2023 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.