Rock CountyPower Outage History
What this grade means
Better than average — fewer or shorter outages than most counties. This county's outage history is better than the national median: recorded outages are less frequent and/or shorter in duration than a typical US county experienced over the same 12-year period. It isn't in the top tier nationally, but its track record points to lower-than-average outage risk.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Mar 23, 2017 | <1 hr | 4,613 (62%) | Unnamed event |
| Oct 19, 2016 | <1 hr | 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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Rock County, Minnesota that day.
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 less than 1 hour 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).
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 |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
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 less than 1 hour and affecting up to 4,613 customers.