Jefferson CountyPower Outage History
What this grade means
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 |
|---|---|---|---|
| Aug 26, 2020 | 86 hrs | 90,667 (76%) | Unnamed event |
| Oct 9, 2020 | 35 hrs | 75,222 (63%) | Unnamed event |
| Oct 11, 2020 | 86 hrs | 51,027 (43%) | Unnamed event |
| Oct 11, 2020 | 4 hrs | 49,557 (41%) | Unnamed event |
| May 10, 2019 | 48 hrs | 40,256 (34%) | Thunderstorm Wind |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Jefferson County, Texas that day.
Over the 12 years from 2014 to 2025, Jefferson County recorded 2,493 distinct power outage events, averaging 3.0 hours per event.
The single worst outage on record in Jefferson County started August 26, 2020, lasting 86 hours and leaving up to 90,667 customers without power (76% of the county) at its peak.
June has historically been the worst month for outages in Jefferson County, with 282 events recorded during that month across the dataset.
Based on this history, Jefferson County earns a Reliability Grade of F, placing it in the 7th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Texas
Counties with the closest reliability grade and national percentile to Jefferson County.
| County | Grade | National percentile |
|---|---|---|
| San Jacinto County | F | 7th |
| Culberson County | F | 8th |
| Leon County | F | 7th |
| Robertson County | F | 7th |
| Upshur County | F | 8th |
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 Jefferson County?
Between 2014 and 2025, Jefferson County recorded 2,493 outage events, averaging 3.0 hours each.
What is Jefferson County's reliability grade?
Jefferson County has a Reliability Grade of F, in the 7th national percentile.
What was the worst power outage in Jefferson County?
The worst outage on record started August 26, 2020, lasting 86 hours and affecting up to 90,667 customers.