Winona County Power Outage History
2015–2025 · Minnesota
Top 20% most reliable nationally — infrequent, short outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jun 1, 2023 | 2 hrs | 4,068 (18%) | Unnamed event |
| Sep 10, 2025 | 0 hrs | 3,400 (15%) | Unnamed event |
| Aug 12, 2025 | 0 hrs | 3,393 (15%) | Unnamed event |
| Oct 18, 2024 | 2 hrs | 3,387 (15%) | Unnamed event |
| Jun 25, 2025 | 2 hrs | 3,382 (15%) | Tornado |
Over the 11 years from 2015 to 2025, Winona County recorded 228 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Winona County started June 1, 2023, lasting 2 hours and leaving up to 4,068 customers without power (18% of the county) at its peak.
June has historically been the worst month for outages in Winona County, with 44 events recorded during that month across the dataset.
Based on this history, Winona County earns a Reliability Grade of A, placing it in the 89th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Winona County's outage profile
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Similar counties in Minnesota
Counties with the closest reliability grade and national percentile to Winona County.
| County | Grade | National percentile |
|---|---|---|
| Traverse County | A | 89th |
| Mahnomen County | A | 90th |
| Polk County | A | 90th |
| Lyon County | A | 88th |
| Renville County | A | 91st |
FAQ
How often does power go out in Winona County?
Between 2015 and 2025, Winona County recorded 228 outage events, averaging 2.6 hours each.
What is Winona County's reliability grade?
Winona County has a Reliability Grade of A, in the 89th national percentile.
What was the worst power outage in Winona County?
The worst outage on record started June 1, 2023, lasting 2 hours and affecting up to 4,068 customers.