Tillman CountyPower Outage History
2014–2025 · Oklahoma
Bottom 20% least reliable nationally — frequent and/or long outages.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Dec 27, 2015 | 78 hrs | 3,246 (72%) | Ice Storm |
| Sep 16, 2021 | 5 hrs | 2,705 (60%) | Drought |
| Feb 18, 2017 | 9 hrs | 2,128 (48%) | Unnamed event |
| May 24, 2017 | <1 hr | 2,026 (45%) | Hail |
| May 23, 2016 | 23 hrs | 1,450 (32%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, Tillman County recorded 525 distinct power outage events, averaging 3.3 hours per event.
The single worst outage on record in Tillman County started December 27, 2015 (Ice Storm), lasting 78 hours and leaving up to 3,246 customers without power (72% of the county) at its peak.
May has historically been the worst month for outages in Tillman County, with 83 events recorded during that month across the dataset.
Based on this history, Tillman County earns a Reliability Grade of F, placing it in the 15th 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 Tillman County.
| County | Grade | National percentile |
|---|---|---|
| Oklahoma County | F | 15th |
| Kiowa County | F | 17th |
| Blaine County | F | 17th |
| Dewey County | F | 18th |
| Jefferson County | F | 18th |
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 Tillman County?
Between 2014 and 2025, Tillman County recorded 525 outage events, averaging 3.3 hours each.
What is Tillman County's reliability grade?
Tillman County has a Reliability Grade of F, in the 15th national percentile.
What was the worst power outage in Tillman County?
The worst outage on record started December 27, 2015 (Ice Storm), lasting 78 hours and affecting up to 3,246 customers.