Barnwell CountyPower Outage History
What this grade means
Better than average — fewer or shorter outages than most counties. This county's outage history is better than the national median: recorded outages are less frequent and/or shorter in duration than a typical US county experienced over the same 12-year period. It isn't in the top tier nationally, but its track record points to lower-than-average outage risk.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Apr 13, 2020 | 37 hrs | 7,897 (26%) | Tornado |
| Sep 27, 2024 | 182 hrs | 6,437 (21%) | Tropical Storm Helene |
| Sep 11, 2017 | 17 hrs | 5,426 (18%) | Thunderstorm Wind |
| Oct 8, 2016 | 13 hrs | 4,839 (16%) | Hurricane Matthew |
| May 6, 2022 | 17 hrs | 4,125 (13%) | Thunderstorm Wind |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Barnwell County, South Carolina that day.
Over the 12 years from 2014 to 2025, Barnwell County recorded 402 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Barnwell County started April 13, 2020 (Tornado), lasting 37 hours and leaving up to 7,897 customers without power (26% of the county) at its peak.
July has historically been the worst month for outages in Barnwell County, with 54 events recorded during that month across the dataset.
Based on this history, Barnwell County earns a Reliability Grade of B, placing it in the 68th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in South Carolina
Counties with the closest reliability grade and national percentile to Barnwell County.
| County | Grade | National percentile |
|---|---|---|
| Lancaster County | B | 68th |
| Beaufort County | B | 69th |
| Charleston County | B | 69th |
| Lexington County | B | 67th |
| Georgetown County | B | 72nd |
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 Barnwell County?
Between 2014 and 2025, Barnwell County recorded 402 outage events, averaging 2.6 hours each.
What is Barnwell County's reliability grade?
Barnwell County has a Reliability Grade of B, in the 68th national percentile.
What was the worst power outage in Barnwell County?
The worst outage on record started April 13, 2020 (Tornado), lasting 37 hours and affecting up to 7,897 customers.