– 0% of Jefferson out 0 customers out in Louisiana

Power outage history

Jefferson Parish Louisiana

40hours

without power for the average customer in a typical year, 2018–2025

20th most of 63 in Louisiana 6.1× the national median

Worst outage on record Hurricane Ida · Sep 1, 2021 89% of customers out · 90% back in 8.1 days

Hours without power, average customer per year 40h / yr State average 27 h · national median 6.6 h

Major outages a year 0.6 Peaks over 10% of customers or 50,000 customers

Typical time to restore 90% 40hours Median across major outages, from the peak

Longest single outage 36.6days Hurricane Ida, over 1% of customers out

Outage hours on storm days 95% Share falling on days with a NOAA storm report here

Worst year 2021 8.8 days without power, average customer

Electricity customers 230,746 ORNL customer model · 8 well-covered years

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 Jefferson's customers who were without power at that day's worst moment.

20152016201720182019202020212022202320242025

0%100% of customers out

Year by year

Hours in the dark, per customer

2021 was the worst well-recorded year, at 8.8 days for the average customer. Hatched years have a thin record and are left out of the averages.

Jefferson, hours without power per customer

JeffersonUS median countyLouisiana average

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
Aug 29, 2021	Hurricane Ida	204,888	89%	36.6 d	8.1 d	46M
Oct 28, 2020	Hurricane Zeta	180,496	78%	10.9 d	5.6 d	14M
Sep 11, 2024	Hurricane Francine	68,190	30%	2.8 d	41 h	1.8M
Oct 6, 2021	No storm report	10,703	5%	14.5 d	21 h	992k
Oct 26, 2019	Tropical Storm Olga	28,125	12%	2.5 d	39 h	638k
Oct 21, 2021	No storm report	4,634	2%	6.5 d	–	433k
Apr 27, 2015	Thunderstorms	34,010	15%	2.0 d	32 h	387k
May 16, 2024	Thunderstorms	36,007	16%	36 h	17 h	360k
Jul 12, 2019	Hurricane Barry	20,272	9%	2.2 d	37 h	267k
Dec 14, 2022	Tornadoes	23,043	10%	27 h	24 h	233k
May 3, 2017	Thunderstorms	8,567	4%	46 h	45 h	174k
Nov 9, 2020	No storm report	3,751	2%	42 h	–	128k
Jul 10, 2019	Hurricane Barry	14,831	6%	11 h	4.5 h	100k
Jun 7, 2017	No storm report	10,485	5%	13 h	11 h	87k
Apr 28, 2020	No storm report	9,730	4%	16 h	6.5 h	77k
May 7, 2025	Thunderstorms	10,808	5%	11 h	14 h	73k
May 6, 2022	No storm report	19,908	9%	5.5 h	4.0 h	68k
Aug 15, 2023	Heat	16,421	7%	7.5 h	7.2 h	63k
Jun 17, 2019	No storm report	17,858	8%	5.0 h	5.2 h	62k
Oct 9, 2020	Hurricane Delta	18,170	8%	8.5 h	5.5 h	55k
Jul 30, 2019	No storm report	19,751	9%	5.2 h	12 min	53k
Mar 11, 2016	No storm report	15,590	7%	5.2 h	2.5 h	50k
Mar 22, 2022	No storm report	9,499	4%	13 h	5.2 h	46k
Jan 8, 2025	No storm report	12,326	5%	5.8 h	6.5 h	42k
Jun 13, 2021	No storm report	4,144	2%	13 h	–	41k
Aug 30, 2019	No storm report	6,702	3%	8.0 h	5.0 h	40k
May 19, 2016	No storm report	10,617	5%	5.8 h	5.0 h	40k
Nov 12, 2020	No storm report	4,416	2%	11 h	–	39k
May 25, 2025	No storm report	22,030	10%	6.2 h	4.5 h	39k
Nov 26, 2020	No storm report	2,824	1%	15 h	–	34k

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 Jefferson from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.

Tropical storm 93%
No storm on record 5.4%
Thunderstorms 0.8%

Who keeps the lights on

Utilities serving Jefferson

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
Entergy Louisiana LLC	Investor Owned	253	218	1.83	11.9	962k

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

Lafourche 78 h
St. John the Baptist 52 h
St. Charles 45 h
Plaquemines 45 h
Jefferson (this county) 40 h
Orleans 29 h
St. Tammany 18 h

Across Louisiana

Where it is darkest

Hours / yr64+

All Louisiana counties →

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 230,746 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 →