Rock 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 |
|---|---|---|---|
| Jul 15, 2024 | 39 hrs | 12,673 (19%) | Thunderstorm Wind |
| Apr 15, 2015 | 2 hrs | 9,902 (15%) | Unnamed event |
| Apr 11, 2019 | 2 hrs | 9,625 (14%) | Flood |
| Jun 23, 2024 | 26 hrs | 6,407 (10%) | Thunderstorm Wind |
| Sep 18, 2015 | 6 hrs | 4,802 (7%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, Rock County recorded 466 distinct power outage events, averaging 1.8 hours per event.
The single worst outage on record in Rock County started July 15, 2024 (Thunderstorm Wind), lasting 39 hours and leaving up to 12,673 customers without power (19% of the county) at its peak.
July has historically been the worst month for outages in Rock County, with 79 events recorded during that month across the dataset.
Based on this history, Rock County earns a Reliability Grade of A, placing it in the 89th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Rock County's outage profile
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Similar counties in Wisconsin
Counties with the closest reliability grade and national percentile to Rock County.
| County | Grade | National percentile |
|---|---|---|
| Juneau County | A | 89th |
| Burnett County | A | 89th |
| Fond du Lac County | A | 90th |
| Eau Claire County | A | 90th |
| Sauk County | A | 90th |
FAQ
How often does power go out in Rock County?
Between 2014 and 2025, Rock County recorded 466 outage events, averaging 1.8 hours each.
What is Rock County's reliability grade?
Rock County has a Reliability Grade of A, in the 89th national percentile.
What was the worst power outage in Rock County?
The worst outage on record started July 15, 2024 (Thunderstorm Wind), lasting 39 hours and affecting up to 12,673 customers.