Lee County Power Outage History
2014–2025 · Illinois
Average — typical outage frequency and duration nationally. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jul 29, 2023 | 22 hrs | 9,505 (37%) | Excessive Heat |
| Aug 11, 2021 | 19 hrs | 9,310 (36%) | Tornado |
| Apr 1, 2023 | 48 hrs | 8,782 (34%) | Tornado |
| Sep 29, 2025 | 1 hrs | 8,245 (32%) | Unnamed event |
| May 20, 2024 | 2 hrs | 7,859 (31%) | Unnamed event |
Over the 12 years from 2014 to 2025, Lee County recorded 314 distinct power outage events, averaging 3.2 hours per event.
The single worst outage on record in Lee County started July 29, 2023 (Excessive Heat), lasting 22 hours and leaving up to 9,505 customers without power (37% of the county) at its peak.
June has historically been the worst month for outages in Lee County, with 55 events recorded during that month across the dataset.
Based on this history, Lee County earns a Reliability Grade of C, placing it in the 46th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Lee County's outage profile
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Similar counties in Illinois
Counties with the closest reliability grade and national percentile to Lee County.
| County | Grade | National percentile |
|---|---|---|
| Shelby County | C | 46th |
| Vermilion County | C | 46th |
| Fayette County | C | 46th |
| Pope County | C | 45th |
| Jefferson County | C | 47th |
FAQ
How often does power go out in Lee County?
Between 2014 and 2025, Lee County recorded 314 outage events, averaging 3.2 hours each.
What is Lee County's reliability grade?
Lee County has a Reliability Grade of C, in the 46th national percentile.
What was the worst power outage in Lee County?
The worst outage on record started July 29, 2023 (Excessive Heat), lasting 22 hours and affecting up to 9,505 customers.