Power outage history
St. Mary Parish Louisiana
10hours
without power for the average customer in a typical year, 2018–2025
58th most of 63 in Louisiana 1.5× the national median
Every day since 2015
Eleven years, one night at a time
Each cell is a day. The brighter it is, the larger the share of St. Mary's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2019 was the worst well-recorded year, at 33 hours for the average customer. Hatched years have a thin record and are left out of the averages.
St. Mary, hours without power per customer
The record
The biggest outages since 2015
Ranked by customer-hours lost: customers out multiplied by how long they stayed out. Times are local.
| Began | Storm | Peak out | Share | Lasted | 90% restored | Customer-hours |
|---|---|---|---|---|---|---|
| Jul 12, 2019 | Hurricane Barry | 17,613 | 64% | 4.0 d | 2.8 d | 823k |
| Sep 11, 2024 | Hurricane Francine | 13,865 | 50% | 2.3 d | 33 h | 454k |
| Oct 9, 2020 | Hurricane Delta | 7,154 | 26% | 2.1 d | 31 h | 166k |
| Aug 29, 2021 | Hurricane Ida | 6,871 | 25% | 34 h | 15 h | 144k |
| Aug 26, 2020 | Hurricane Laura | 2,816 | 10% | 2.6 d | 2.4 d | 64k |
| Feb 15, 2021 | No storm report | 2,523 | 9% | 15 h | 8.0 h | 15k |
| Dec 8, 2017 | No storm report | 2,501 | 9% | 9.2 h | 4.0 h | 9.8k |
| Oct 22, 2017 | No storm report | 5,388 | 19% | 4.2 h | 3.5 h | 9.8k |
| Apr 16, 2023 | No storm report | 3,180 | 11% | 5.5 h | 3.8 h | 9.4k |
| May 14, 2018 | No storm report | 4,239 | 15% | 6.2 h | 5.5 h | 9.4k |
| May 21, 2023 | No storm report | 4,316 | 16% | 2.0 h | 48 min | 8.6k |
| Feb 16, 2021 | No storm report | 1,448 | 5% | 5.8 h | 8.0 h | 8.0k |
| May 19, 2016 | Thunderstorms | 4,619 | 17% | 4.0 h | 48 min | 7.6k |
| Jun 16, 2025 | No storm report | 4,952 | 18% | 1.2 h | 1.2 h | 6.2k |
| May 21, 2022 | No storm report | 4,150 | 15% | 5.8 h | 1.0 h | 5.5k |
| Mar 28, 2023 | No storm report | 3,227 | 12% | 2.0 h | 2.0 h | 5.2k |
| Apr 9, 2016 | No storm report | 1,799 | 6% | 3.8 h | 3.0 h | 5.2k |
| Jan 9, 2016 | No storm report | 6,046 | 22% | 2.0 h | 30 min | 4.7k |
| May 3, 2017 | Thunderstorms | 1,650 | 6% | 6.5 h | 6.8 h | 4.7k |
| Jul 11, 2018 | No storm report | 818 | 3% | 12 h | – | 4.5k |
| May 15, 2023 | No storm report | 1,976 | 7% | 2.5 h | 1.2 h | 4.5k |
| Aug 25, 2024 | No storm report | 3,354 | 12% | 1.8 h | 1.5 h | 4.4k |
| Dec 23, 2022 | No storm report | 7,342 | 27% | 1.0 h | 1.0 h | 4.4k |
| Jul 30, 2015 | Thunderstorms | 2,519 | 9% | 2.8 h | 2.2 h | 4.3k |
| Jul 26, 2017 | No storm report | 7,936 | 29% | 48 min | 48 min | 4.2k |
| May 16, 2024 | No storm report | 1,932 | 7% | 3.2 h | 2.2 h | 4.1k |
| Apr 29, 2024 | No storm report | 1,997 | 7% | 4.2 h | 2.2 h | 4.0k |
| Mar 17, 2021 | No storm report | 1,275 | 5% | 2.8 h | – | 3.5k |
| Mar 19, 2016 | No storm report | 1,764 | 6% | 2.2 h | 30 min | 3.2k |
| Mar 27, 2016 | No storm report | 883 | 3% | 4.0 h | – | 3.2k |
After the peak
How fast the lights come back
Each line is one major outage, from its peak. The amber line is the typical path.
When it happens
The outage clock
Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.
What was happening
Weather behind the outages
Each outage is matched to NOAA storm reports for St. Mary from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Tropical storm 84%
- No storm on record 15%
Who keeps the lights on
Utilities serving St. Mary
As each utility reports to the Energy Information Administration for its whole Louisiana territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Cleco Power LLC | Investor Owned | 212 | 146 | 2.26 | 14.3 | 253k |
| Morgan City | LA | – | – | – | 12.3 | 69k |
| South Louisiana Elec Coop Assn | Cooperative | 176 | 176 | 2.43 | 12.3 | 17k |
EIA Form 861, latest year each utility reported. Outage minutes are SAIDI, the yearly minutes the average customer goes without power; outages a year are SAIFI.
Next door
Neighbouring counties
- Terrebonne 54 h
- Assumption 53 h
- St. Martin 18 h
- St. Mary (this county) 10 h
- Iberia 9.5 h
About these numbers
Notes
Outages come from the EAGLE-I record of utility outage maps collected every 15 minutes by Oak Ridge National Laboratory. Hours without power are customer-hours divided by the county's 27,709 electricity customers. Averages use well-covered years from 2018. Outages shorter than 15 minutes, and utilities that publish no outage map, are not in the record, so these figures understate the total. How every number is made →