Power outage history
Jefferson County Missouri
5.7hours
without power for the average customer in a typical year, 2018–2025
46th most of 110 in Missouri 14% below 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
2025 was the worst well-recorded year, at 15 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 14, 2025 | Thunderstorms | 29,155 | 27% | 3.9 d | 2.2 h | 938k |
| Jul 13, 2016 | Thunderstorms | 19,529 | 18% | 2.0 d | 41 h | 371k |
| May 16, 2025 | Thunderstorms | 12,931 | 12% | 2.4 d | 2.3 d | 368k |
| Aug 10, 2020 | Thunderstorms | 18,913 | 17% | 40 h | 32 h | 256k |
| Apr 15, 2023 | Tornadoes | 12,784 | 12% | 25 h | 23 h | 173k |
| Jun 30, 2023 | Thunderstorms | 5,749 | 5% | 46 h | 2.0 d | 113k |
| Aug 12, 2021 | Thunderstorms | 11,138 | 10% | 23 h | 20 h | 111k |
| Jul 29, 2023 | Thunderstorms | 6,730 | 6% | 24 h | 22 h | 99k |
| Jul 16, 2023 | Thunderstorms | 8,948 | 8% | 20 h | 17 h | 89k |
| Jul 16, 2024 | No storm report | 3,978 | 4% | 24 h | – | 52k |
| Feb 24, 2016 | No storm report | 6,765 | 6% | 10 h | 8.5 h | 36k |
| Jan 13, 2017 | Ice storm | 6,808 | 6% | 7.2 h | 7.5 h | 30k |
| Apr 16, 2023 | No storm report | 2,041 | 2% | 9.8 h | – | 19k |
| Apr 18, 2024 | Thunderstorms | 7,453 | 7% | 5.2 h | 6.5 h | 19k |
| Dec 22, 2022 | Winter storm | 2,824 | 3% | 11 h | – | 18k |
| May 19, 2025 | Thunderstorms | 2,932 | 3% | 8.8 h | – | 18k |
| Jul 8, 2024 | No storm report | 3,661 | 3% | 7.2 h | – | 17k |
| Jul 29, 2025 | Heat | 2,388 | 2% | 10 h | – | 15k |
| Jun 17, 2022 | Thunderstorms | 2,312 | 2% | 9.5 h | – | 14k |
| May 13, 2015 | No storm report | 5,429 | 5% | 2.5 h | 2.5 h | 13k |
| May 26, 2024 | Tornadoes | 2,147 | 2% | 8.0 h | – | 12k |
| Nov 27, 2019 | No storm report | 3,061 | 3% | 8.8 h | – | 11k |
| Jul 14, 2023 | Thunderstorms | 1,864 | 2% | 8.5 h | – | 11k |
| May 21, 2022 | No storm report | 1,826 | 2% | 6.5 h | – | 9.6k |
| Apr 1, 2023 | Thunderstorms | 1,914 | 2% | 6.8 h | – | 9.3k |
| Mar 30, 2023 | No storm report | 2,550 | 2% | 5.2 h | – | 9.3k |
| Nov 21, 2015 | No storm report | 4,425 | 4% | 3.5 h | – | 8.8k |
| Aug 9, 2015 | Thunderstorms | 2,271 | 2% | 7.8 h | – | 8.7k |
| Dec 28, 2025 | No storm report | 2,903 | 3% | 6.0 h | – | 8.1k |
| Sep 10, 2015 | Thunderstorms | 2,880 | 3% | 3.8 h | – | 7.4k |
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 81%
- No storm on record 9.6%
- Tornadoes 7.2%
- Winter storm 0.9%
- Heat 0.7%
- Flooding 0.6%
Who keeps the lights on
Utilities serving Jefferson
As each utility reports to the Energy Information Administration for its whole Missouri territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Union Electric Co | Investor Owned | 594 | 119 | 1.18 | 13.3 | 1.1M |
| Citizens Electric Corporation | Cooperative | 1,688 | 128 | 3.86 | 15.2 | 25k |
| Crawford Electric Coop, Inc | Cooperative | 362 | 216 | 2.04 | 13.2 | 20k |
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
- Washington 10 h
- Monroe, IL 7.3 h
- Jefferson (this county) 5.7 h
- Ste. Genevieve 4.5 h
- St. Louis 3.8 h
- Franklin 3.8 h
- St. Francois 3.8 h
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 108,266 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 →