Mahnomen CountyPower Outage History
2020–2025 · Minnesota
Top 20% most reliable nationally — infrequent, short outages.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Oct 11, 2025 | 46 hrs | 1,887 (46%) | Unnamed event |
| Jun 21, 2025 | 12 hrs | 1,070 (26%) | Thunderstorm Wind |
| Jul 27, 2023 | 2 hrs | 787 (19%) | Unnamed event |
| Dec 14, 2020 | 1 hrs | 367 (9%) | Unnamed event |
| Apr 23, 2022 | 6 hrs | 367 (9%) | Unnamed event |
Over the 6 years from 2020 to 2025, Mahnomen County recorded 67 distinct power outage events, averaging 3.7 hours per event.
The single worst outage on record in Mahnomen County started October 11, 2025, lasting 46 hours and leaving up to 1,887 customers without power (46% of the county) at its peak.
June has historically been the worst month for outages in Mahnomen County, with 14 events recorded during that month across the dataset.
Based on this history, Mahnomen County earns a Reliability Grade of A, placing it in the 90th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Mahnomen County's outage profile
See more picks in our Best Small Power Stations (Under 1,000Wh) roundup.
Outage-prep kit
See our outage-prep guides.
Similar counties in Minnesota
Counties with the closest reliability grade and national percentile to Mahnomen County.
| County | Grade | National percentile |
|---|---|---|
| Polk County | A | 90th |
| Renville County | A | 91st |
| Scott County | A | 91st |
| Houston County | A | 91st |
| Winona County | A | 89th |
Most reliable counties in Minnesota
The top 3 counties in Minnesota by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Clearwater County | A | 99th |
| Brown County | A | 99th |
| Jackson County | A | 98th |
Least reliable counties in Minnesota
The bottom 3 counties in Minnesota by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Cass County | F | 16th |
| Aitkin County | F | 18th |
| Itasca County | D | 25th |
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 Mahnomen County?
Between 2020 and 2025, Mahnomen County recorded 67 outage events, averaging 3.7 hours each.
What is Mahnomen County's reliability grade?
Mahnomen County has a Reliability Grade of A, in the 90th national percentile.
What was the worst power outage in Mahnomen County?
The worst outage on record started October 11, 2025, lasting 46 hours and affecting up to 1,887 customers.