Winnebago County Power Outage History
2015–2025 · Iowa
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 |
|---|---|---|---|
| Dec 16, 2021 | 26 hrs | 3,317 (31%) | Winter Storm |
| Dec 23, 2020 | 19 hrs | 2,187 (21%) | Blizzard |
| Apr 11, 2019 | 74 hrs | 2,116 (20%) | High Wind |
| Oct 16, 2018 | 3 hrs | 2,028 (19%) | Frost/Freeze |
| May 30, 2022 | 4 hrs | 1,768 (17%) | Unnamed event |
Over the 11 years from 2015 to 2025, Winnebago County recorded 248 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Winnebago County started December 16, 2021 (Winter Storm), lasting 26 hours and leaving up to 3,317 customers without power (31% of the county) at its peak.
June has historically been the worst month for outages in Winnebago County, with 35 events recorded during that month across the dataset.
Based on this history, Winnebago County earns a Reliability Grade of B, placing it in the 72nd 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 Iowa
Counties with the closest reliability grade and national percentile to Winnebago County.
| County | Grade | National percentile |
|---|---|---|
| Delaware County | B | 72nd |
| Pottawattamie County | B | 72nd |
| Henry County | B | 71st |
| Monona County | B | 74th |
| Taylor County | B | 74th |
FAQ
How often does power go out in Winnebago County?
Between 2015 and 2025, Winnebago County recorded 248 outage events, averaging 2.6 hours each.
What is Winnebago County's reliability grade?
Winnebago County has a Reliability Grade of B, in the 72nd national percentile.
What was the worst power outage in Winnebago County?
The worst outage on record started December 16, 2021 (Winter Storm), lasting 26 hours and affecting up to 3,317 customers.