Winnebago County Power Outage History
2014–2025 · Wisconsin
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 |
|---|---|---|---|
| Jul 23, 2022 | 26 hrs | 20,041 (26%) | Thunderstorm Wind |
| May 16, 2018 | 1 hrs | 12,757 (16%) | Unnamed event |
| Jun 14, 2017 | 22 hrs | 10,230 (13%) | Flood |
| May 31, 2019 | 1 hrs | 9,837 (13%) | Unnamed event |
| May 3, 2019 | 0 hrs | 7,889 (10%) | Unnamed event |
Over the 12 years from 2014 to 2025, Winnebago County recorded 387 distinct power outage events, averaging 2.5 hours per event.
The single worst outage on record in Winnebago County started July 23, 2022 (Thunderstorm Wind), lasting 26 hours and leaving up to 20,041 customers without power (26% of the county) at its peak.
July has historically been the worst month for outages in Winnebago County, with 55 events recorded during that month across the dataset.
Based on this history, Winnebago County earns a Reliability Grade of B, placing it in the 77th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Winnebago County's outage profile
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Outage-prep kit
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Similar counties in Wisconsin
Counties with the closest reliability grade and national percentile to Winnebago County.
| County | Grade | National percentile |
|---|---|---|
| Clark County | B | 78th |
| Adams County | B | 76th |
| Barron County | B | 76th |
| Grant County | B | 79th |
| Brown County | B | 79th |
FAQ
How often does power go out in Winnebago County?
Between 2014 and 2025, Winnebago County recorded 387 outage events, averaging 2.5 hours each.
What is Winnebago County's reliability grade?
Winnebago County has a Reliability Grade of B, in the 77th national percentile.
What was the worst power outage in Winnebago County?
The worst outage on record started July 23, 2022 (Thunderstorm Wind), lasting 26 hours and affecting up to 20,041 customers.