Harper CountyPower Outage History
2015–2025 · Oklahoma
Average — typical outage frequency and duration nationally.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| May 9, 2016 | 4 hrs | 1,691 (41%) | Unnamed event |
| Jun 28, 2020 | 3 hrs | 1,443 (35%) | Thunderstorm Wind |
| Oct 22, 2017 | 4 hrs | 1,421 (34%) | Unnamed event |
| Jun 1, 2025 | 2 hrs | 1,111 (27%) | Unnamed event |
| Aug 11, 2025 | 2 hrs | 1,072 (26%) | Heat |
Over the 11 years from 2015 to 2025, Harper County recorded 598 distinct power outage events, averaging 2.8 hours per event.
The single worst outage on record in Harper County started May 9, 2016, lasting 4 hours and leaving up to 1,691 customers without power (41% of the county) at its peak.
June has historically been the worst month for outages in Harper County, with 80 events recorded during that month across the dataset.
Based on this history, Harper County earns a Reliability Grade of C, placing it in the 49th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Oklahoma
Counties with the closest reliability grade and national percentile to Harper County.
| County | Grade | National percentile |
|---|---|---|
| Seminole County | C | 48th |
| Pontotoc County | C | 48th |
| Comanche County | C | 50th |
| Garvin County | C | 50th |
| Major County | C | 51st |
Most reliable counties in Oklahoma
The top 3 counties in Oklahoma by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Texas County | A | 96th |
| Kay County | A | 95th |
| Greer County | A | 89th |
Least reliable counties in Oklahoma
The bottom 3 counties in Oklahoma by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Caddo County | F | 4th |
| Washita County | F | 10th |
| Oklahoma County | F | 15th |
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 Harper County?
Between 2015 and 2025, Harper County recorded 598 outage events, averaging 2.8 hours each.
What is Harper County's reliability grade?
Harper County has a Reliability Grade of C, in the 49th national percentile.
What was the worst power outage in Harper County?
The worst outage on record started May 9, 2016, lasting 4 hours and affecting up to 1,691 customers.