Rock County Power Outage History
2015–2025 · Minnesota
Better than average — fewer or shorter outages than most counties. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Mar 23, 2017 | 0 hrs | 4,613 (62%) | Unnamed event |
| Oct 19, 2016 | 1 hrs | 4,417 (59%) | Unnamed event |
| Jul 6, 2016 | 11 hrs | 3,924 (53%) | Unnamed event |
| Jun 15, 2016 | 18 hrs | 3,677 (49%) | Excessive Heat |
| Aug 19, 2016 | 19 hrs | 2,197 (30%) | Unnamed event |
Over the 11 years from 2015 to 2025, Rock County recorded 396 distinct power outage events, averaging 2.7 hours per event.
The single worst outage on record in Rock County started March 23, 2017, lasting 0 hours and leaving up to 4,613 customers without power (62% of the county) at its peak.
May has historically been the worst month for outages in Rock County, with 64 events recorded during that month across the dataset.
Based on this history, Rock County earns a Reliability Grade of B, placing it in the 67th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Rock County's outage profile
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Outage-prep kit
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Similar counties in Minnesota
Counties with the closest reliability grade and national percentile to Rock County.
| County | Grade | National percentile |
|---|---|---|
| Chisago County | B | 67th |
| Hennepin County | B | 66th |
| Wabasha County | B | 66th |
| Murray County | B | 68th |
| Stevens County | B | 66th |
FAQ
How often does power go out in Rock County?
Between 2015 and 2025, Rock County recorded 396 outage events, averaging 2.7 hours each.
What is Rock County's reliability grade?
Rock County has a Reliability Grade of B, in the 67th national percentile.
What was the worst power outage in Rock County?
The worst outage on record started March 23, 2017, lasting 0 hours and affecting up to 4,613 customers.