Pierce County Power Outage History
2015–2025 · 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 |
|---|---|---|---|
| Apr 1, 2023 | 14 hrs | 4,570 (26%) | Winter Storm |
| Aug 18, 2025 | 1 hrs | 4,120 (24%) | Thunderstorm Wind |
| Mar 27, 2020 | 1 hrs | 4,070 (24%) | Unnamed event |
| May 11, 2022 | 1 hrs | 3,469 (20%) | Hail |
| Aug 3, 2022 | 11 hrs | 2,857 (17%) | Unnamed event |
Over the 11 years from 2015 to 2025, Pierce County recorded 143 distinct power outage events, averaging 2.8 hours per event.
The single worst outage on record in Pierce County started April 1, 2023 (Winter Storm), lasting 14 hours and leaving up to 4,570 customers without power (26% of the county) at its peak.
July has historically been the worst month for outages in Pierce County, with 32 events recorded during that month across the dataset.
Based on this history, Pierce County earns a Reliability Grade of A, placing it in the 90th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Pierce County's outage profile
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Similar counties in Wisconsin
Counties with the closest reliability grade and national percentile to Pierce County.
| County | Grade | National percentile |
|---|---|---|
| Columbia County | A | 90th |
| Sauk County | A | 90th |
| Richland County | A | 91st |
| Eau Claire County | A | 90th |
| Douglas County | A | 91st |
FAQ
How often does power go out in Pierce County?
Between 2015 and 2025, Pierce County recorded 143 outage events, averaging 2.8 hours each.
What is Pierce County's reliability grade?
Pierce County has a Reliability Grade of A, in the 90th national percentile.
What was the worst power outage in Pierce County?
The worst outage on record started April 1, 2023 (Winter Storm), lasting 14 hours and affecting up to 4,570 customers.