Marlboro 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 22, 2016 | 33 hrs | 4,421 (23%) | Winter Weather |
| Oct 8, 2016 | 115 hrs | 4,202 (22%) | Hurricane Matthew |
| Sep 15, 2018 | 108 hrs | 4,043 (21%) | Unnamed event |
| Apr 13, 2020 | 21 hrs | 3,518 (18%) | Thunderstorm Wind |
| Mar 2, 2018 | 1 hrs | 3,359 (17%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Marlboro County, South Carolina that day.
Over the 12 years from 2014 to 2025, Marlboro County recorded 276 distinct power outage events, averaging 3.6 hours per event.
The single worst outage on record in Marlboro County started January 22, 2016 (Winter Weather), lasting 33 hours and leaving up to 4,421 customers without power (23% of the county) at its peak.
July has historically been the worst month for outages in Marlboro County, with 39 events recorded during that month across the dataset.
Based on this history, Marlboro County earns a Reliability Grade of C, placing it in the 55th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in South Carolina
Counties with the closest reliability grade and national percentile to Marlboro County.
| County | Grade | National percentile |
|---|---|---|
| Sumter County | C | 56th |
| Jasper County | C | 54th |
| Clarendon County | C | 58th |
| Williamsburg County | C | 52nd |
| Calhoun County | B | 60th |
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 Marlboro County?
Between 2014 and 2025, Marlboro County recorded 276 outage events, averaging 3.6 hours each.
What is Marlboro County's reliability grade?
Marlboro County has a Reliability Grade of C, in the 55th national percentile.
What was the worst power outage in Marlboro County?
The worst outage on record started January 22, 2016 (Winter Weather), lasting 33 hours and affecting up to 4,421 customers.