Harper CountyPower Outage History
What this grade means
(How grades are calculated)Average — typical outage frequency and duration nationally. This county sits in the middle of the national distribution — its outage frequency and duration over the past 12 years are close to the nationwide median, neither notably better nor worse than most other US counties. A typical amount of backup-power preparedness is reasonable here.
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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Harper County, Oklahoma that day.
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).
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 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.