Union County Power Outage History
2015–2025 · 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 | 250 hrs | 3,866 (10%) | Thunderstorm Wind |
| Oct 4, 2025 | 2 hrs | 1,822 (5%) | Unnamed event |
| Aug 30, 2025 | 11 hrs | 1,820 (5%) | Unnamed event |
| Aug 5, 2025 | 2 hrs | 1,669 (4%) | Unnamed event |
| Jan 7, 2018 | 1 hrs | 1,421 (4%) | Unnamed event |
Over the 11 years from 2015 to 2025, Union County recorded 155 distinct power outage events, averaging 4.0 hours per event.
The single worst outage on record in Union County started September 27, 2024 (Thunderstorm Wind), lasting 250 hours and leaving up to 3,866 customers without power (10% of the county) at its peak.
June has historically been the worst month for outages in Union County, with 23 events recorded during that month across the dataset.
Based on this history, Union County earns a Reliability Grade of B, placing it in the 80th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Union County's outage profile
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Outage-prep kit
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Similar counties in South Carolina
Counties with the closest reliability grade and national percentile to Union County.
| County | Grade | National percentile |
|---|---|---|
| Orangeburg County | B | 80th |
| Richland County | B | 76th |
| Kershaw County | A | 83rd |
| Horry County | B | 76th |
| York County | A | 84th |
FAQ
How often does power go out in Union County?
Between 2015 and 2025, Union County recorded 155 outage events, averaging 4.0 hours each.
What is Union County's reliability grade?
Union County has a Reliability Grade of B, in the 80th national percentile.
What was the worst power outage in Union County?
The worst outage on record started September 27, 2024 (Thunderstorm Wind), lasting 250 hours and affecting up to 3,866 customers.