PowerOutageHistory
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DeKalb County Power Outage History

2014–2025 · Illinois

Top 20% most reliable nationally — infrequent, short outages. How grades are calculated

Total events
369
Avg duration
2.7 hrs
Longest outage
70 hrs
National percentile
89th

Outages by year

Outages by month (seasonality)

Worst outage events on record

DateDurationCustomers affectedCause
Aug 10, 202013 hrs10,587 (13%)Tornado
Feb 19, 20166 hrs7,097 (9%)Unnamed event
Aug 11, 202133 hrs6,262 (8%)Tornado
Apr 10, 20153 hrs4,810 (6%)Tornado
Jun 14, 201724 hrs4,520 (6%)Thunderstorm Wind

Over the 12 years from 2014 to 2025, DeKalb County recorded 369 distinct power outage events, averaging 2.7 hours per event.

The single worst outage on record in DeKalb County started August 10, 2020 (Tornado), lasting 13 hours and leaving up to 10,587 customers without power (13% of the county) at its peak.

June has historically been the worst month for outages in DeKalb County, with 45 events recorded during that month across the dataset.

Based on this history, DeKalb County earns a Reliability Grade of A, placing it in the 89th percentile nationally for grid reliability (higher percentile = more reliable).

Sized for DeKalb County's outage profile

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Similar counties in Illinois

Counties with the closest reliability grade and national percentile to DeKalb County.

CountyGradeNational percentile
Effingham CountyA89th
White CountyA88th
Wayne CountyA88th
Schuyler CountyA91st
Edwards CountyA91st

FAQ

How often does power go out in DeKalb County?

Between 2014 and 2025, DeKalb County recorded 369 outage events, averaging 2.7 hours each.

What is DeKalb County's reliability grade?

DeKalb County has a Reliability Grade of A, in the 89th national percentile.

What was the worst power outage in DeKalb County?

The worst outage on record started August 10, 2020 (Tornado), lasting 13 hours and affecting up to 10,587 customers.

Data: ORNL EAGLE-I Recorded Electricity Outages (2014–2025), CC BY 4.0. Storm names: NOAA Storm Events Database. Last data refresh: 2025. See methodology.