Trempealeau County Power Outage History
2014–2025 · Wisconsin
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 |
|---|---|---|---|
| Dec 16, 2021 | 21 hrs | 2,900 (20%) | Winter Storm |
| Jul 13, 2024 | 26 hrs | 1,725 (12%) | Flood |
| Jul 29, 2023 | 14 hrs | 1,460 (10%) | Hail |
| Aug 29, 2021 | 3 hrs | 1,450 (10%) | Lightning |
| Jul 19, 2020 | 2 hrs | 1,448 (10%) | Funnel Cloud |
Over the 12 years from 2014 to 2025, Trempealeau County recorded 165 distinct power outage events, averaging 2.9 hours per event.
The single worst outage on record in Trempealeau County started December 16, 2021 (Winter Storm), lasting 21 hours and leaving up to 2,900 customers without power (20% of the county) at its peak.
July has historically been the worst month for outages in Trempealeau County, with 38 events recorded during that month across the dataset.
Based on this history, Trempealeau County earns a Reliability Grade of A, placing it in the 86th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Trempealeau County's outage profile
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Similar counties in Wisconsin
Counties with the closest reliability grade and national percentile to Trempealeau County.
| County | Grade | National percentile |
|---|---|---|
| Monroe County | A | 86th |
| Calumet County | A | 87th |
| Vernon County | A | 85th |
| Dunn County | A | 85th |
| La Crosse County | A | 84th |
FAQ
How often does power go out in Trempealeau County?
Between 2014 and 2025, Trempealeau County recorded 165 outage events, averaging 2.9 hours each.
What is Trempealeau County's reliability grade?
Trempealeau County has a Reliability Grade of A, in the 86th national percentile.
What was the worst power outage in Trempealeau County?
The worst outage on record started December 16, 2021 (Winter Storm), lasting 21 hours and affecting up to 2,900 customers.