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 |
|---|---|---|---|
| Jul 23, 2022 | 26 hrs | 20,041 (26%) | Thunderstorm Wind |
| May 16, 2018 | <1 hr | 12,757 (16%) | Unnamed event |
| Jun 14, 2017 | 22 hrs | 10,230 (13%) | Flood |
| May 31, 2019 | <1 hr | 9,837 (13%) | Unnamed event |
| May 3, 2019 | <1 hr | 7,889 (10%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Winnebago County, Wisconsin that day.
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).
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 |
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 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.