Jefferson 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 30, 2021 | 195 hrs | 204,888 (89%) | Tropical Storm Ida |
| Aug 29, 2021 | 18 hrs | 201,639 (87%) | Tropical Storm Ida |
| Aug 30, 2021 | <1 hr | 200,679 (87%) | Tropical Storm Ida |
| Oct 28, 2020 | 29 hrs | 180,496 (78%) | Hurricane Zeta |
| Aug 29, 2021 | 12 hrs | 175,147 (76%) | Tropical Storm Ida |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Jefferson Parish, Louisiana that day.
Over the 12 years from 2014 to 2025, Jefferson Parish recorded 3,437 distinct power outage events, averaging 3.1 hours per event.
The single worst outage on record in Jefferson Parish started August 30, 2021 (Tropical Storm Ida), lasting 195 hours and leaving up to 204,888 customers without power (89% of the county) at its peak.
June has historically been the worst month for outages in Jefferson Parish, with 383 events recorded during that month across the dataset.
Based on this history, Jefferson Parish earns a Reliability Grade of F, placing it in the 1st percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Louisiana
Counties with the closest reliability grade and national percentile to Jefferson Parish.
| County | Grade | National percentile |
|---|---|---|
| Allen Parish | F | 1st |
| Tensas Parish | F | 1st |
| Grant Parish | F | 2nd |
| Tangipahoa Parish | F | 1st |
| St. James Parish | F | 1st |
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 Jefferson Parish?
Between 2014 and 2025, Jefferson Parish recorded 3,437 outage events, averaging 3.1 hours each.
What is Jefferson Parish's reliability grade?
Jefferson Parish has a Reliability Grade of F, in the 1st national percentile.
What was the worst power outage in Jefferson Parish?
The worst outage on record started August 30, 2021 (Tropical Storm Ida), lasting 195 hours and affecting up to 204,888 customers.