Calhoun County Power Outage History
2014–2025 · South Carolina
Better than average — fewer or shorter outages than most counties. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Sep 27, 2024 | 86 hrs | 5,126 (41%) | Tropical Storm Helene |
| May 25, 2021 | 1 hrs | 3,782 (30%) | Unnamed event |
| Jul 27, 2021 | 2 hrs | 3,050 (24%) | Unnamed event |
| Oct 8, 2016 | 103 hrs | 2,719 (21%) | Hurricane Matthew |
| Oct 8, 2016 | 8 hrs | 2,713 (21%) | Hurricane Matthew |
Over the 12 years from 2014 to 2025, Calhoun County recorded 506 distinct power outage events, averaging 2.2 hours per event.
The single worst outage on record in Calhoun County started September 27, 2024 (Tropical Storm Helene), lasting 86 hours and leaving up to 5,126 customers without power (41% of the county) at its peak.
August has historically been the worst month for outages in Calhoun County, with 72 events recorded during that month across the dataset.
Based on this history, Calhoun County earns a Reliability Grade of B, placing it in the 60th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Calhoun County's outage profile
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Similar counties in South Carolina
Counties with the closest reliability grade and national percentile to Calhoun County.
| County | Grade | National percentile |
|---|---|---|
| Bamberg County | B | 62nd |
| Clarendon County | C | 58th |
| Sumter County | C | 56th |
| Marlboro County | C | 55th |
| Jasper County | C | 54th |
FAQ
How often does power go out in Calhoun County?
Between 2014 and 2025, Calhoun County recorded 506 outage events, averaging 2.2 hours each.
What is Calhoun County's reliability grade?
Calhoun County has a Reliability Grade of B, in the 60th national percentile.
What was the worst power outage in Calhoun County?
The worst outage on record started September 27, 2024 (Tropical Storm Helene), lasting 86 hours and affecting up to 5,126 customers.