Power Out Map
– 0% of Lake out 0 customers out in Tennessee

Power outage history

Lake County Tennessee

3.7hours

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

46th most of 73 in Tennessee 43% below the national median

Worst outage on record May 4, 2021 35% of customers out · 90% back in 3.2 hours
Hours without power, average customer per year 3.7h / yr State average 5.8 h · national median 6.6 h
Major outages a year 4.4 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 1hours Median across major outages, from the peak
Longest single outage 2.8days Dec 10, 2021, over 1% of customers out
Outage hours on storm days 71% Share falling on days with a NOAA storm report here
Worst year 2021 9.4 hours without power, average customer
Electricity customers 2,815 ORNL customer model · 7 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 Lake'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 9.4 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Lake, hours without power per customer

LakeUS median countyTennessee average
0 2 4 6 8 10 12 ’16 8.3 ’17 1.8 ’18 2.4 ’19 6.6 ’20 9.4 ’21 1.2 ’22 2.4 ’23 2.4 ’24 US 6.6 TN 5.8

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
May 4, 2021 Thunderstorms 987 35% 44 h 3.2 h 14k
May 4, 2020 Thunderstorms 1,125 40% 21 h 1.5 h 12k
Dec 10, 2021 Tornadoes 556 20% 2.8 d 42 h 10k
Oct 7, 2017 No storm report 2,641 94% 3.8 h 3.8 h 9.9k
Apr 30, 2017 Thunderstorms 1,878 67% 9.0 h 5.0 h 6.2k
May 26, 2024 Thunderstorms 850 30% 25 h 22 h 4.0k
Jun 10, 2017 No storm report 2,610 93% 2.0 h 2.0 h 3.2k
May 5, 2020 No storm report 1,101 39% 19 h 1.0 h 2.6k
Jul 18, 2023 Heat 1,106 39% 3.0 h 30 min 2.0k
Jun 21, 2019 No storm report 1,129 40% 5.2 h 1.5 h 1.8k
Jul 29, 2019 No storm report 1,161 41% 1.8 h 1.5 h 1.7k
Nov 17, 2018 No storm report 1,142 41% 2.0 h 2.0 h 1.7k

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 +2h 90% by +4h

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

  • Thunderstorms 46%
  • No storm on record 29%
  • Tornadoes 15%
  • Heat 5.9%
  • Winter storm 3.2%
  • Windstorm 1.2%

Who keeps the lights on

Utilities serving Lake

As each utility reports to the Energy Information Administration for its whole Tennessee territory, not this county alone. Outage minutes include major storm days.

Utility Type Outage min / yr Excl. major storms Outages / yr Residential ¢/kWh Customers
Gibson Electric Members Corp Cooperative 312 140 2.71 13.7 29k

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 Tennessee

Where it is darkest

Hours / yr64+

All Tennessee 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 2,815 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 →