Jefferson CountyPower Outage History
What this grade means
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 |
|---|---|---|---|
| Jan 11, 2020 | 15 hrs | 52,800 (14%) | Thunderstorm Wind |
| Jun 28, 2018 | 27 hrs | 47,818 (13%) | Thunderstorm Wind |
| Jun 7, 2025 | 53 hrs | 39,648 (11%) | Thunderstorm Wind |
| Mar 4, 2025 | 55 hrs | 39,184 (11%) | Strong Wind |
| Apr 12, 2020 | 62 hrs | 34,661 (9%) | Thunderstorm Wind |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Jefferson County, Alabama that day.
Over the 9 years from 2017 to 2025, Jefferson County recorded 4,778 distinct power outage events, averaging 2.5 hours per event.
The single worst outage on record in Jefferson County started January 11, 2020 (Thunderstorm Wind), lasting 15 hours and leaving up to 52,800 customers without power (14% of the county) at its peak.
July has historically been the worst month for outages in Jefferson County, with 546 events recorded during that month across the dataset.
Based on this history, Jefferson County earns a Reliability Grade of C, placing it in the 53rd percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Alabama
Counties with the closest reliability grade and national percentile to Jefferson County.
| County | Grade | National percentile |
|---|---|---|
| Clarke County | C | 51st |
| Etowah County | C | 56th |
| Geneva County | C | 50th |
| Choctaw County | C | 50th |
| Bullock County | C | 50th |
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 2017 and 2025, Jefferson County recorded 4,778 outage events, averaging 2.5 hours each.
What is Jefferson County's reliability grade?
Jefferson County has a Reliability Grade of C, in the 53rd national percentile.
What was the worst power outage in Jefferson County?
The worst outage on record started January 11, 2020 (Thunderstorm Wind), lasting 15 hours and affecting up to 52,800 customers.