Chester County Power Outage History
2014–2025 · South Carolina
Worse than average — more frequent or longer 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 | 112 hrs | 12,625 (52%) | Tropical Storm |
| May 22, 2020 | 26 hrs | 3,480 (14%) | Thunderstorm Wind |
| Jun 16, 2022 | 20 hrs | 3,348 (14%) | Thunderstorm Wind |
| Nov 12, 2021 | 2 hrs | 3,262 (13%) | Unnamed event |
| Sep 16, 2025 | 1 hrs | 3,109 (13%) | Unnamed event |
Over the 12 years from 2014 to 2025, Chester County recorded 561 distinct power outage events, averaging 3.7 hours per event.
The single worst outage on record in Chester County started September 27, 2024 (Tropical Storm), lasting 112 hours and leaving up to 12,625 customers without power (52% of the county) at its peak.
August has historically been the worst month for outages in Chester County, with 74 events recorded during that month across the dataset.
Based on this history, Chester County earns a Reliability Grade of D, placing it in the 36th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in South Carolina
Counties with the closest reliability grade and national percentile to Chester County.
| County | Grade | National percentile |
|---|---|---|
| Hampton County | D | 35th |
| Colleton County | D | 38th |
| Darlington County | D | 34th |
| Allendale County | C | 40th |
| Aiken County | D | 32nd |
FAQ
How often does power go out in Chester County?
Between 2014 and 2025, Chester County recorded 561 outage events, averaging 3.7 hours each.
What is Chester County's reliability grade?
Chester County has a Reliability Grade of D, in the 36th national percentile.
What was the worst power outage in Chester County?
The worst outage on record started September 27, 2024 (Tropical Storm), lasting 112 hours and affecting up to 12,625 customers.