Power Out Map
– 0% of Jefferson out 0 customers out in Mississippi

Power outage history

Jefferson County Mississippi

53hours

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

2nd most of 74 in Mississippi 8.1× the national median

Worst outage on record Feb 17, 2021 100% of customers out · 90% back in 4.3 days
Hours without power, average customer per year 53h / yr State average 9.8 h · national median 6.6 h
Major outages a year 14.6 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 3hours Median across major outages, from the peak
Longest single outage 12.9days Feb 17, 2021, over 1% of customers out
Outage hours on storm days 64% Share falling on days with a NOAA storm report here
Worst year 2021 6.0 days without power, average customer
Electricity customers 4,028 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 6.0 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 countyMississippi average
0 50 100 150 200 14 ’15 1.4 ’16 11 ’17 1.6 ’18 23 ’19 84 ’20 144 ’21 35 ’22 34 ’23 51 ’24 52 ’25 MS 9.8 US 6.6

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
Feb 17, 2021 Winter storm 4,028 100% 12.9 d 4.3 d 443k
Oct 9, 2020 Hurricane Delta 4,028 100% 6.8 d 4.4 d 190k
Dec 28, 2024 Tornadoes 2,277 57% 5.0 d 3.0 d 83k
Jun 24, 2019 No storm report 2,143 53% 2.5 d 39 h 50k
Aug 29, 2021 Hurricane Ida 2,069 51% 2.9 d 47 h 37k
Jun 14, 2023 Thunderstorms 2,262 56% 4.1 d 23 h 35k
Apr 17, 2022 Thunderstorms 2,300 57% 43 h 25 h 35k
Oct 27, 2017 No storm report 1,337 33% 24 h 1.8 h 31k
Feb 15, 2025 Thunderstorms 1,745 43% 2.6 d 20 h 29k
Apr 22, 2020 Thunderstorms 1,980 49% 47 h 14 h 26k
May 17, 2015 Thunderstorms 1,326 33% 25 h 21 h 26k
May 13, 2024 No storm report 2,258 56% 2.5 d 8.0 h 26k

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.

0% 25% 50% 75% 100% peak+24h+48h+72h+96h half back by +10h 90% by +36h

When it happens

The outage clock

Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.

00061218 Jan inside

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.

  • No storm on record 36%
  • Winter storm 29%
  • Tropical storm 17%
  • Thunderstorms 12%
  • Tornadoes 6.0%

Who keeps the lights on

Utilities serving Jefferson

As each utility reports to the Energy Information Administration for its whole Mississippi 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 Mississippi LLC Investor Owned 640 410 2.61 13.9 384k
Southwest Mississippi E P A Cooperative 2,736 1,832 – 15.3 23k

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

Across Mississippi

Where it is darkest

Hours / yr64+

All Mississippi 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 4,028 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 →