Coles 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 29, 2023 | 78 hrs | 9,390 (29%) | Drought |
| Jul 13, 2016 | 12 hrs | 8,551 (26%) | Thunderstorm Wind |
| Sep 8, 2015 | 3 hrs | 8,078 (25%) | Thunderstorm Wind |
| Feb 24, 2016 | 15 hrs | 6,112 (19%) | Blizzard |
| Mar 30, 2025 | 6 hrs | 5,432 (17%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Coles County, Illinois that day.
Over the 12 years from 2014 to 2025, Coles County recorded 291 distinct power outage events, averaging 2.1 hours per event.
The single worst outage on record in Coles County started June 29, 2023 (Drought), lasting 78 hours and leaving up to 9,390 customers without power (29% of the county) at its peak.
June has historically been the worst month for outages in Coles County, with 38 events recorded during that month across the dataset.
Based on this history, Coles County earns a Reliability Grade of A, placing it in the 84th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Illinois
Counties with the closest reliability grade and national percentile to Coles County.
| County | Grade | National percentile |
|---|---|---|
| Jersey County | A | 84th |
| Menard County | A | 82nd |
| Richland County | A | 87th |
| Wayne County | A | 88th |
| White County | A | 88th |
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 Coles County?
Between 2014 and 2025, Coles County recorded 291 outage events, averaging 2.1 hours each.
What is Coles County's reliability grade?
Coles County has a Reliability Grade of A, in the 84th national percentile.
What was the worst power outage in Coles County?
The worst outage on record started June 29, 2023 (Drought), lasting 78 hours and affecting up to 9,390 customers.