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

Power outage history

Clay County Tennessee

11hours

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

7th most of 73 in Tennessee 1.6× the national median

Worst outage on record Jun 22, 2019 92% of customers out · 90% back in 5.5 hours
Hours without power, average customer per year 11h / yr State average 5.8 h · national median 6.6 h
Major outages a year 12.3 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 2hours Median across major outages, from the peak
Longest single outage 27hours Mar 3, 2023, over 1% of customers out
Outage hours on storm days 23% Share falling on days with a NOAA storm report here
Worst year 2019 14 hours without power, average customer
Electricity customers 4,055 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 Clay'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

2019 was the worst well-recorded year, at 14 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Clay, hours without power per customer

ClayUS median countyTennessee average
0 5 10 15 20 8.3 ’15 8.9 ’16 4.2 ’17 9.4 ’18 14 ’19 7.4 ’20 11 ’21 6.6 ’22 13 ’23 14 ’24 8.8 ’25 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
Jun 21, 2019 Thunderstorms 3,725 92% 13 h 5.5 h 24k
May 2, 2021 No storm report 4,055 100% 6.2 h 5.5 h 24k
May 28, 2018 No storm report 1,648 41% 16 h 16 h 23k
Mar 24, 2024 No storm report 1,993 49% 5.5 h 5.5 h 11k
Mar 3, 2023 Windstorm 1,953 48% 27 h 5.5 h 11k
Aug 10, 2019 No storm report 1,452 36% 6.8 h 6.8 h 9.6k
Mar 20, 2016 No storm report 938 23% 18 h 16 h 9.2k
Oct 26, 2025 No storm report 2,884 71% 3.0 h 3.0 h 8.7k
Aug 15, 2019 No storm report 4,055 100% 3.0 h 1.8 h 8.4k
Dec 11, 2021 Tornadoes 1,439 35% 11 h 3.0 h 7.4k
Jun 11, 2023 Thunderstorms 1,673 41% 6.8 h 48 min 7.2k
Jun 14, 2020 No storm report 1,994 49% 8.5 h – 6.6k

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 +4h 90% by +6h

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

  • No storm on record 77%
  • Thunderstorms 15%
  • Windstorm 3.3%
  • Tornadoes 2.3%
  • Tropical storm 1.0%
  • Winter storm 0.8%

Who keeps the lights on

Utilities serving Clay

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
Upper Cumberland E M C Cooperative 344 255 – 13.7 46k
Tri-County Elec Member Corp (TN) Cooperative 528 239 3.91 12.9 25k

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 4,055 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 →