Cass CountyPower Outage History
What this grade means
Bottom 20% least reliable nationally — frequent and/or long outages. This county ranks in the least reliable fifth of all US counties in our dataset: some combination of frequent outages, long restoration times, or customers affected puts it near the bottom nationally. Backup power is worth prioritizing here rather than treating it as optional.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jul 21, 2016 | 109 hrs | 14,111 (59%) | Heat |
| May 30, 2022 | 64 hrs | 8,131 (34%) | Hail |
| Jun 21, 2022 | 45 hrs | 7,984 (33%) | Hail |
| Jun 21, 2025 | 38 hrs | 7,469 (31%) | Tornado |
| Oct 6, 2024 | 17 hrs | 6,018 (25%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Cass County, Minnesota that day.
Over the 12 years from 2014 to 2025, Cass County recorded 847 distinct power outage events, averaging 3.2 hours per event.
The single worst outage on record in Cass County started July 21, 2016 (Heat), lasting 109 hours and leaving up to 14,111 customers without power (59% of the county) at its peak.
July has historically been the worst month for outages in Cass County, with 120 events recorded during that month across the dataset.
Based on this history, Cass County earns a Reliability Grade of F, placing it in the 16th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Minnesota
Counties with the closest reliability grade and national percentile to Cass County.
| County | Grade | National percentile |
|---|---|---|
| Aitkin County | F | 18th |
| Itasca County | D | 25th |
| Pine County | D | 37th |
| Lake County | D | 38th |
| Pipestone County | D | 38th |
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 Cass County?
Between 2014 and 2025, Cass County recorded 847 outage events, averaging 3.2 hours each.
What is Cass County's reliability grade?
Cass County has a Reliability Grade of F, in the 16th national percentile.
What was the worst power outage in Cass County?
The worst outage on record started July 21, 2016 (Heat), lasting 109 hours and affecting up to 14,111 customers.