Sumter 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 |
|---|---|---|---|
| Oct 19, 2021 | <1 hr | 3,412 (34%) | Unnamed event |
| Jul 22, 2022 | 8 hrs | 2,598 (26%) | Thunderstorm Wind |
| Oct 31, 2023 | 5 hrs | 2,596 (26%) | Unnamed event |
| May 4, 2021 | 16 hrs | 2,482 (24%) | Thunderstorm Wind |
| Oct 23, 2021 | <1 hr | 2,066 (20%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Sumter County, Alabama that day.
Over the 9 years from 2017 to 2025, Sumter County recorded 656 distinct power outage events, averaging 2.9 hours per event.
The single worst outage on record in Sumter County started October 19, 2021, lasting less than 1 hour and leaving up to 3,412 customers without power (34% of the county) at its peak.
June has historically been the worst month for outages in Sumter County, with 91 events recorded during that month across the dataset.
Based on this history, Sumter County earns a Reliability Grade of C, placing it in the 49th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Alabama
Counties with the closest reliability grade and national percentile to Sumter County.
| County | Grade | National percentile |
|---|---|---|
| Cullman County | C | 49th |
| Bullock County | C | 50th |
| Choctaw County | C | 50th |
| Geneva County | C | 50th |
| Clarke County | C | 51st |
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 Sumter County?
Between 2017 and 2025, Sumter County recorded 656 outage events, averaging 2.9 hours each.
What is Sumter County's reliability grade?
Sumter County has a Reliability Grade of C, in the 49th national percentile.
What was the worst power outage in Sumter County?
The worst outage on record started October 19, 2021, lasting less than 1 hour and affecting up to 3,412 customers.