Ascension ParishPower 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 |
|---|---|---|---|
| Aug 29, 2021 | 19 hrs | 54,507 (90%) | Unnamed event |
| Aug 30, 2021 | 405 hrs | 51,521 (85%) | Unnamed event |
| Sep 11, 2024 | 87 hrs | 42,788 (70%) | Hurricane Francine |
| Aug 29, 2021 | 7 hrs | 21,099 (35%) | Unnamed event |
| Apr 27, 2015 | 3 hrs | 18,441 (30%) | Thunderstorm Wind |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Ascension Parish, Louisiana that day.
Over the 12 years from 2014 to 2025, Ascension Parish recorded 1,483 distinct power outage events, averaging 2.8 hours per event.
The single worst outage on record in Ascension Parish started August 29, 2021, lasting 19 hours and leaving up to 54,507 customers without power (90% of the county) at its peak.
July has historically been the worst month for outages in Ascension Parish, with 194 events recorded during that month across the dataset.
Based on this history, Ascension Parish earns a Reliability Grade of F, placing it in the 2nd percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Louisiana
Counties with the closest reliability grade and national percentile to Ascension Parish.
| County | Grade | National percentile |
|---|---|---|
| Vernon Parish | F | 2nd |
| Union Parish | F | 3rd |
| Assumption Parish | F | 3rd |
| Livingston Parish | F | 2nd |
| St. Bernard Parish | F | 3rd |
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 Ascension Parish?
Between 2014 and 2025, Ascension Parish recorded 1,483 outage events, averaging 2.8 hours each.
What is Ascension Parish's reliability grade?
Ascension Parish has a Reliability Grade of F, in the 2nd national percentile.
What was the worst power outage in Ascension Parish?
The worst outage on record started August 29, 2021, lasting 19 hours and affecting up to 54,507 customers.