Clark County Power Outage History
2015–2025 · 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 |
|---|---|---|---|
| Jun 29, 2023 | 60 hrs | 4,592 (59%) | Drought |
| Jun 18, 2025 | 26 hrs | 2,658 (34%) | Thunderstorm Wind |
| Apr 9, 2020 | 5 hrs | 2,376 (30%) | Thunderstorm Wind |
| Jun 1, 2020 | 2 hrs | 2,340 (30%) | Unnamed event |
| Nov 5, 2022 | 8 hrs | 1,788 (23%) | Unnamed event |
Over the 11 years from 2015 to 2025, Clark County recorded 430 distinct power outage events, averaging 2.4 hours per event.
The single worst outage on record in Clark County started June 29, 2023 (Drought), lasting 60 hours and leaving up to 4,592 customers without power (59% of the county) at its peak.
June has historically been the worst month for outages in Clark County, with 54 events recorded during that month across the dataset.
Based on this history, Clark County earns a Reliability Grade of C, placing it in the 42nd percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Illinois
Counties with the closest reliability grade and national percentile to Clark County.
| County | Grade | National percentile |
|---|---|---|
| Rock Island County | C | 41st |
| Perry County | C | 44th |
| Carroll County | C | 45th |
| Pope County | C | 45th |
| Fayette County | C | 46th |
FAQ
How often does power go out in Clark County?
Between 2015 and 2025, Clark County recorded 430 outage events, averaging 2.4 hours each.
What is Clark County's reliability grade?
Clark County has a Reliability Grade of C, in the 42nd national percentile.
What was the worst power outage in Clark County?
The worst outage on record started June 29, 2023 (Drought), lasting 60 hours and affecting up to 4,592 customers.