Winnebago CountyPower Outage History
What this grade means
Better than average — fewer or shorter outages than most counties. This county's outage history is better than the national median: recorded outages are less frequent and/or shorter in duration than a typical US county experienced over the same 12-year period. It isn't in the top tier nationally, but its track record points to lower-than-average outage risk.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Aug 10, 2020 | 119 hrs | 24,445 (18%) | Tornado |
| Feb 22, 2023 | 72 hrs | 23,635 (18%) | Winter Storm |
| Jul 16, 2024 | 93 hrs | 17,055 (13%) | Thunderstorm Wind |
| Jun 29, 2017 | 40 hrs | 14,324 (11%) | Thunderstorm Wind |
| Apr 1, 2023 | 51 hrs | 14,187 (11%) | Winter Storm |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Winnebago County, Illinois that day.
Over the 12 years from 2014 to 2025, Winnebago County recorded 890 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Winnebago County started August 10, 2020 (Tornado), lasting 119 hours and leaving up to 24,445 customers without power (18% of the county) at its peak.
June has historically been the worst month for outages in Winnebago County, with 118 events recorded during that month across the dataset.
Based on this history, Winnebago County earns a Reliability Grade of B, placing it in the 61st percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Illinois
Counties with the closest reliability grade and national percentile to Winnebago County.
| County | Grade | National percentile |
|---|---|---|
| Randolph County | B | 61st |
| Franklin County | B | 62nd |
| Crawford County | B | 60th |
| Whiteside County | B | 60th |
| Adams County | B | 62nd |
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 Winnebago County?
Between 2014 and 2025, Winnebago County recorded 890 outage events, averaging 2.6 hours each.
What is Winnebago County's reliability grade?
Winnebago County has a Reliability Grade of B, in the 61st national percentile.
What was the worst power outage in Winnebago County?
The worst outage on record started August 10, 2020 (Tornado), lasting 119 hours and affecting up to 24,445 customers.