Clay CountyPower Outage History
What this grade means
Top 20% most reliable nationally — infrequent, short outages. This county ranks in the most reliable fifth of all US counties in our dataset, based on 12 years of real DOE outage records: outages happen less often here, and when they do occur they tend to be resolved quickly compared to the rest of the country. Baseline outage risk is low, though a severe local storm can still occasionally cause a longer-than-usual outage regardless of the long-term track record.
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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Clay County, Illinois that day.
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).
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 |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
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.