Harrison County Power Outage History
2014–2025 · Mississippi
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 |
|---|---|---|---|
| Oct 28, 2020 | 120 hrs | 97,348 (89%) | Hurricane Zeta |
| May 13, 2018 | 0 hrs | 34,247 (31%) | Unnamed event |
| Oct 27, 2020 | 0 hrs | 10,916 (10%) | Hurricane Zeta |
| Jun 13, 2021 | 2 hrs | 9,849 (9%) | Thunderstorm Wind |
| Aug 29, 2021 | 22 hrs | 8,247 (8%) | Tropical Storm Ida |
Over the 12 years from 2014 to 2025, Harrison County recorded 1,082 distinct power outage events, averaging 1.4 hours per event.
The single worst outage on record in Harrison County started October 28, 2020 (Hurricane Zeta), lasting 120 hours and leaving up to 97,348 customers without power (89% of the county) at its peak.
June has historically been the worst month for outages in Harrison County, with 140 events recorded during that month across the dataset.
Based on this history, Harrison County earns a Reliability Grade of D, placing it in the 36th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Harrison County's outage profile
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Similar counties in Mississippi
Counties with the closest reliability grade and national percentile to Harrison County.
| County | Grade | National percentile |
|---|---|---|
| Sunflower County | D | 36th |
| Leake County | D | 36th |
| Hancock County | D | 36th |
| Kemper County | D | 36th |
| Tate County | D | 34th |
FAQ
How often does power go out in Harrison County?
Between 2014 and 2025, Harrison County recorded 1,082 outage events, averaging 1.4 hours each.
What is Harrison County's reliability grade?
Harrison County has a Reliability Grade of D, in the 36th national percentile.
What was the worst power outage in Harrison County?
The worst outage on record started October 28, 2020 (Hurricane Zeta), lasting 120 hours and affecting up to 97,348 customers.