Clay County Power Outage History
2014–2025 · Illinois
Top 20% most reliable nationally — infrequent, short outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jun 2, 2018 | 14 hrs | 5,589 (44%) | Thunderstorm Wind |
| Apr 27, 2019 | 1 hrs | 2,421 (19%) | Unnamed event |
| May 12, 2018 | 1 hrs | 2,280 (18%) | Unnamed event |
| May 27, 2024 | 15 hrs | 1,378 (11%) | Tornado |
| May 17, 2018 | 4 hrs | 1,235 (10%) | Unnamed event |
Over the 12 years from 2014 to 2025, Clay County recorded 165 distinct power outage events, averaging 2.3 hours per event.
The single worst outage on record in Clay County started June 2, 2018 (Thunderstorm Wind), lasting 14 hours and leaving up to 5,589 customers without power (44% of the county) at its peak.
April has historically been the worst month for outages in Clay County, with 22 events recorded during that month across the dataset.
Based on this history, Clay County earns a Reliability Grade of A, placing it in the 91st percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Clay County's outage profile
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Similar counties in Illinois
Counties with the closest reliability grade and national percentile to Clay County.
| County | Grade | National percentile |
|---|---|---|
| Edwards County | A | 91st |
| Schuyler County | A | 91st |
| Lake County | A | 92nd |
| Cass County | A | 92nd |
| Kendall County | A | 93rd |
FAQ
How often does power go out in Clay County?
Between 2014 and 2025, Clay County recorded 165 outage events, averaging 2.3 hours each.
What is Clay County's reliability grade?
Clay County has a Reliability Grade of A, in the 91st national percentile.
What was the worst power outage in Clay County?
The worst outage on record started June 2, 2018 (Thunderstorm Wind), lasting 14 hours and affecting up to 5,589 customers.