Greenville CountyPower Outage History
What this grade means
Bottom 20% least reliable nationally — frequent and/or long outages. This county ranks in the least reliable fifth of all US counties in our dataset: some combination of frequent outages, long restoration times, or customers affected puts it near the bottom nationally. Backup power is worth prioritizing here rather than treating it as optional.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Sep 27, 2024 | 333 hrs | 270,050 (89%) | Thunderstorm Wind |
| Oct 29, 2020 | 106 hrs | 71,283 (24%) | Unnamed event |
| Dec 9, 2018 | 94 hrs | 60,062 (20%) | Unnamed event |
| Apr 13, 2020 | 36 hrs | 35,691 (12%) | Thunderstorm Wind |
| Sep 11, 2017 | 81 hrs | 33,465 (11%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Greenville County, South Carolina that day.
Over the 12 years from 2014 to 2025, Greenville County recorded 2,371 distinct power outage events, averaging 3.3 hours per event.
The single worst outage on record in Greenville County started September 27, 2024 (Thunderstorm Wind), lasting 333 hours and leaving up to 270,050 customers without power (89% of the county) at its peak.
June has historically been the worst month for outages in Greenville County, with 283 events recorded during that month across the dataset.
Based on this history, Greenville County earns a Reliability Grade of F, placing it in the 8th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in South Carolina
Counties with the closest reliability grade and national percentile to Greenville County.
| County | Grade | National percentile |
|---|---|---|
| McCormick County | F | 6th |
| Dillon County | F | 12th |
| Spartanburg County | F | 12th |
| Anderson County | F | 14th |
| Marion County | F | 14th |
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 Greenville County?
Between 2014 and 2025, Greenville County recorded 2,371 outage events, averaging 3.3 hours each.
What is Greenville County's reliability grade?
Greenville County has a Reliability Grade of F, in the 8th national percentile.
What was the worst power outage in Greenville County?
The worst outage on record started September 27, 2024 (Thunderstorm Wind), lasting 333 hours and affecting up to 270,050 customers.