Marion 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 |
|---|---|---|---|
| Oct 8, 2016 | 322 hrs | 12,009 (59%) | Hurricane Matthew |
| Sep 15, 2018 | 30 hrs | 10,385 (51%) | Hurricane Florence |
| Sep 14, 2018 | 21 hrs | 5,065 (25%) | Unnamed event |
| Sep 24, 2017 | 2 hrs | 4,259 (21%) | Unnamed event |
| Jun 4, 2021 | 1 hrs | 3,744 (18%) | Tornado |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Marion County, South Carolina that day.
Over the 12 years from 2014 to 2025, Marion County recorded 615 distinct power outage events, averaging 5.5 hours per event.
The single worst outage on record in Marion County started October 8, 2016 (Hurricane Matthew), lasting 322 hours and leaving up to 12,009 customers without power (59% of the county) at its peak.
June has historically been the worst month for outages in Marion County, with 80 events recorded during that month across the dataset.
Based on this history, Marion County earns a Reliability Grade of F, placing it in the 14th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in South Carolina
Counties with the closest reliability grade and national percentile to Marion County.
| County | Grade | National percentile |
|---|---|---|
| Abbeville County | F | 15th |
| Anderson County | F | 14th |
| Spartanburg County | F | 12th |
| Dillon County | F | 12th |
| Oconee County | F | 19th |
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 Marion County?
Between 2014 and 2025, Marion County recorded 615 outage events, averaging 5.5 hours each.
What is Marion County's reliability grade?
Marion County has a Reliability Grade of F, in the 14th national percentile.
What was the worst power outage in Marion County?
The worst outage on record started October 8, 2016 (Hurricane Matthew), lasting 322 hours and affecting up to 12,009 customers.