Winnebago County Power Outage History
2014–2025 · Illinois
Better than average — fewer or shorter 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 |
|---|---|---|---|
| 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 |
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).
Sized for Winnebago County's outage profile
See more picks in our Best Small Power Stations (Under 1,000Wh) roundup.
Outage-prep kit
See our outage-prep guides.
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 |
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.