St. Mary Parish Power Outage History
2014–2025 · Louisiana
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 |
|---|---|---|---|
| Jul 13, 2019 | 71 hrs | 17,613 (62%) | Unnamed event |
| Sep 11, 2024 | 70 hrs | 13,865 (49%) | Tropical Storm Francine |
| Jul 27, 2017 | 1 hrs | 7,936 (28%) | Unnamed event |
| Sep 21, 2020 | 1 hrs | 7,659 (27%) | Unnamed event |
| Dec 24, 2022 | 1 hrs | 7,342 (26%) | Unnamed event |
Over the 12 years from 2014 to 2025, St. Mary Parish recorded 720 distinct power outage events, averaging 1.9 hours per event.
The single worst outage on record in St. Mary Parish started July 13, 2019, lasting 71 hours and leaving up to 17,613 customers without power (62% of the county) at its peak.
July has historically been the worst month for outages in St. Mary Parish, with 90 events recorded during that month across the dataset.
Based on this history, St. Mary Parish earns a Reliability Grade of D, placing it in the 25th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for St. Mary Parish's outage profile
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Similar counties in Louisiana
Counties with the closest reliability grade and national percentile to St. Mary Parish.
| County | Grade | National percentile |
|---|---|---|
| Richland Parish | D | 25th |
| Madison Parish | D | 25th |
| Evangeline Parish | D | 24th |
| Iberia Parish | D | 26th |
| Lincoln Parish | D | 24th |
FAQ
How often does power go out in St. Mary Parish?
Between 2014 and 2025, St. Mary Parish recorded 720 outage events, averaging 1.9 hours each.
What is St. Mary Parish's reliability grade?
St. Mary Parish has a Reliability Grade of D, in the 25th national percentile.
What was the worst power outage in St. Mary Parish?
The worst outage on record started July 13, 2019, lasting 71 hours and affecting up to 17,613 customers.