Clarendon 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 13, 2017 | 3 hrs | 6,701 (22%) | Unnamed event |
| Aug 10, 2021 | <1 hr | 6,546 (21%) | Unnamed event |
| Oct 8, 2016 | 7 hrs | 6,298 (21%) | Hurricane Matthew |
| Oct 8, 2016 | 138 hrs | 6,285 (21%) | Hurricane Matthew |
| Apr 19, 2019 | 15 hrs | 5,407 (18%) | Tornado |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Clarendon County, South Carolina that day.
Over the 12 years from 2014 to 2025, Clarendon County recorded 596 distinct power outage events, averaging 2.3 hours per event.
The single worst outage on record in Clarendon County started October 13, 2017, lasting 3 hours and leaving up to 6,701 customers without power (22% of the county) at its peak.
June has historically been the worst month for outages in Clarendon County, with 81 events recorded during that month across the dataset.
Based on this history, Clarendon County earns a Reliability Grade of C, placing it in the 58th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in South Carolina
Counties with the closest reliability grade and national percentile to Clarendon County.
| County | Grade | National percentile |
|---|---|---|
| Sumter County | C | 56th |
| Calhoun County | B | 60th |
| Marlboro County | C | 55th |
| Bamberg County | B | 62nd |
| Jasper County | C | 54th |
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 Clarendon County?
Between 2014 and 2025, Clarendon County recorded 596 outage events, averaging 2.3 hours each.
What is Clarendon County's reliability grade?
Clarendon County has a Reliability Grade of C, in the 58th national percentile.
What was the worst power outage in Clarendon County?
The worst outage on record started October 13, 2017, lasting 3 hours and affecting up to 6,701 customers.