Jefferson County Power Outage History
2014–2025 · Wisconsin
Average — typical outage frequency and duration nationally. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| May 29, 2024 | 0 hrs | 13,807 (39%) | Tornado |
| Jul 29, 2023 | 63 hrs | 12,904 (37%) | Thunderstorm Wind |
| Jun 16, 2022 | 15 hrs | 8,397 (24%) | Thunderstorm Wind |
| Jun 25, 2023 | 17 hrs | 8,279 (23%) | Strong Wind |
| Mar 15, 2025 | 15 hrs | 7,953 (23%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, Jefferson County recorded 450 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Jefferson County started May 29, 2024 (Tornado), lasting 0 hours and leaving up to 13,807 customers without power (39% of the county) at its peak.
July has historically been the worst month for outages in Jefferson County, with 73 events recorded during that month across the dataset.
Based on this history, Jefferson County earns a Reliability Grade of C, placing it in the 46th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Wisconsin
Counties with the closest reliability grade and national percentile to Jefferson County.
| County | Grade | National percentile |
|---|---|---|
| Marquette County | C | 46th |
| Sawyer County | C | 44th |
| Waupaca County | C | 44th |
| Walworth County | C | 49th |
| Waukesha County | C | 42nd |
FAQ
How often does power go out in Jefferson County?
Between 2014 and 2025, Jefferson County recorded 450 outage events, averaging 2.6 hours each.
What is Jefferson County's reliability grade?
Jefferson County has a Reliability Grade of C, in the 46th national percentile.
What was the worst power outage in Jefferson County?
The worst outage on record started May 29, 2024 (Tornado), lasting 0 hours and affecting up to 13,807 customers.