Power outage history
Jefferson County Kentucky
5.8hours
without power for the average customer in a typical year, 2018–2025
79th most of 119 in Kentucky close to the national median
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.
Year by year
Hours in the dark, per customer
2023 was the worst well-recorded year, at 18 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Jefferson, hours without power per customer
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 |
|---|---|---|---|---|---|---|
| Mar 3, 2023 | Windstorm | 82,578 | 21% | 5.1 d | 3.4 d | 5.0M |
| Nov 15, 2018 | Ice storm | 79,447 | 20% | 2.6 d | 45 h | 1.8M |
| May 26, 2024 | Thunderstorms | 54,284 | 14% | 3.0 d | 2.4 d | 1.7M |
| May 16, 2025 | Thunderstorms | 30,299 | 8% | 42 h | 40 h | 676k |
| Aug 25, 2023 | Thunderstorms | 26,444 | 7% | 43 h | 43 h | 477k |
| Jul 20, 2018 | Thunderstorms | 26,689 | 7% | 42 h | 45 h | 454k |
| Jun 25, 2023 | Thunderstorms | 23,449 | 6% | 37 h | 42 h | 328k |
| Apr 5, 2023 | Thunderstorms | 20,296 | 5% | 25 h | 26 h | 278k |
| Apr 13, 2022 | Thunderstorms | 19,473 | 5% | 24 h | 3.8 h | 232k |
| May 31, 2018 | Thunderstorms | 27,245 | 7% | 21 h | 24 h | 193k |
| Mar 14, 2019 | No storm report | 20,413 | 5% | 19 h | 21 h | 157k |
| Apr 1, 2023 | Thunderstorms | 10,928 | 3% | 22 h | 24 h | 142k |
| Sep 27, 2024 | Hurricane Helene | 9,934 | 3% | 24 h | 32 h | 138k |
| Jul 17, 2015 | Thunderstorms | 15,233 | 4% | 14 h | 17 h | 114k |
| Jun 26, 2018 | Thunderstorms | 24,759 | 6% | 9.0 h | 12 h | 114k |
| Aug 1, 2024 | Thunderstorms | 15,288 | 4% | 18 h | 23 h | 112k |
| Mar 30, 2022 | No storm report | 12,670 | 3% | 14 h | 26 h | 108k |
| Mar 30, 2025 | Thunderstorms | 24,061 | 6% | 7.8 h | 9.0 h | 89k |
| Jul 11, 2020 | Thunderstorms | 14,215 | 4% | 8.8 h | 15 h | 62k |
| Jun 23, 2019 | Thunderstorms | 12,473 | 3% | 7.2 h | 13 h | 61k |
| Jul 6, 2022 | Thunderstorms | 12,860 | 3% | 7.0 h | 8.2 h | 46k |
| May 21, 2022 | Thunderstorms | 9,599 | 2% | 7.8 h | 15 h | 45k |
| Jun 22, 2022 | Thunderstorms | 15,625 | 4% | 5.2 h | 15 h | 44k |
| Oct 20, 2018 | No storm report | 12,283 | 3% | 5.8 h | 7.5 h | 37k |
| Dec 11, 2021 | Thunderstorms | 8,586 | 2% | 8.0 h | 15 h | 36k |
| Jun 12, 2016 | Thunderstorms | 13,087 | 3% | 4.2 h | 10 h | 34k |
| Mar 1, 2017 | Thunderstorms | 6,128 | 2% | 5.0 h | 4.8 h | 24k |
| Jun 26, 2015 | Thunderstorms | 10,923 | 3% | 3.5 h | 8.0 h | 24k |
| May 7, 2023 | Tornadoes | 5,394 | 1% | 4.5 h | 16 h | 21k |
| Jul 29, 2015 | Thunderstorms | 9,621 | 2% | 2.8 h | 6.0 h | 19k |
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.
- Thunderstorms 41%
- Windstorm 40%
- Ice storm 14%
- No storm on record 3.4%
- Tropical storm 1.1%
Who keeps the lights on
Utilities serving Jefferson
As each utility reports to the Energy Information Administration for its whole Kentucky territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Louisville Gas & Electric Co | Investor Owned | 228 | 94 | 1.18 | 12.4 | 388k |
| Salt River Electric Coop Corp | Cooperative | 512 | 126 | 2.31 | 10.9 | 54k |
| Shelby Energy Coop, Inc | Cooperative | 245 | 198 | 1.86 | 13.9 | 17k |
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
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 390,033 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 →