Tillman CountyPower Outage History
What this grade means
(How grades are calculated)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 |
|---|---|---|---|
| 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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Tillman County, Oklahoma that day.
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).
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 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.