Harmon CountyPower Outage History
2014–2025 · Oklahoma
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 |
|---|---|---|---|
| Oct 22, 2015 | <1 hr | 1,218 (83%) | Drought |
| Oct 22, 2015 | 14 hrs | 1,218 (83%) | Drought |
| Oct 22, 2015 | 9 hrs | 1,218 (83%) | Drought |
| May 16, 2015 | 4 hrs | 1,217 (83%) | Drought |
| Dec 28, 2015 | 68 hrs | 1,204 (82%) | Ice Storm |
Over the 12 years from 2014 to 2025, Harmon County recorded 90 distinct power outage events, averaging 2.7 hours per event.
The single worst outage on record in Harmon County started October 22, 2015 (Drought), lasting less than 1 hour and leaving up to 1,218 customers without power (83% of the county) at its peak.
June has historically been the worst month for outages in Harmon County, with 14 events recorded during that month across the dataset.
Based on this history, Harmon County earns a Reliability Grade of F, placing it in the 19th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Harmon County's outage profile
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Read our mission →Similar counties in Oklahoma
Counties with the closest reliability grade and national percentile to Harmon County.
| County | Grade | National percentile |
|---|---|---|
| Logan County | F | 19th |
| Jefferson County | F | 18th |
| Dewey County | F | 18th |
| Blaine County | F | 17th |
| Kingfisher County | D | 21st |
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 Harmon County?
Between 2014 and 2025, Harmon County recorded 90 outage events, averaging 2.7 hours each.
What is Harmon County's reliability grade?
Harmon County has a Reliability Grade of F, in the 19th national percentile.
What was the worst power outage in Harmon County?
The worst outage on record started October 22, 2015 (Drought), lasting less than 1 hour and affecting up to 1,218 customers.