Warren County Power Outage History
2014–2025 · Illinois
Worse than average — more frequent or longer outages than most counties. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Oct 22, 2015 | 2 hrs | 6,801 (80%) | Unnamed event |
| Dec 4, 2023 | 3 hrs | 5,611 (66%) | Unnamed event |
| Dec 4, 2023 | 4 hrs | 4,980 (59%) | Unnamed event |
| Jul 17, 2015 | 19 hrs | 3,892 (46%) | Tornado |
| Dec 28, 2015 | 56 hrs | 3,590 (42%) | Tornado |
Over the 12 years from 2014 to 2025, Warren County recorded 350 distinct power outage events, averaging 3.8 hours per event.
The single worst outage on record in Warren County started October 22, 2015, lasting 2 hours and leaving up to 6,801 customers without power (80% of the county) at its peak.
June has historically been the worst month for outages in Warren County, with 43 events recorded during that month across the dataset.
Based on this history, Warren County earns a Reliability Grade of D, placing it in the 35th 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 Warren County.
| County | Grade | National percentile |
|---|---|---|
| Gallatin County | D | 35th |
| De Witt County | D | 32nd |
| Monroe County | D | 38th |
| Washington County | D | 31st |
| Rock Island County | C | 41st |
FAQ
How often does power go out in Warren County?
Between 2014 and 2025, Warren County recorded 350 outage events, averaging 3.8 hours each.
What is Warren County's reliability grade?
Warren County has a Reliability Grade of D, in the 35th national percentile.
What was the worst power outage in Warren County?
The worst outage on record started October 22, 2015, lasting 2 hours and affecting up to 6,801 customers.