Power outage history
Montgomery County Illinois
4.5hours
without power for the average customer in a typical year, 2018–2025
50th most of 101 in Illinois 32% 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 Montgomery's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2022 was the worst well-recorded year, at 11 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Montgomery, 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 |
|---|---|---|---|---|---|---|
| Jun 17, 2022 | Thunderstorms | 3,049 | 29% | 2.1 d | 30 h | 52k |
| Feb 2, 2022 | Winter storm | 3,207 | 31% | 14 h | 4.8 h | 19k |
| Mar 21, 2025 | No storm report | 236 | 2% | 2.5 d | – | 13k |
| Feb 24, 2016 | No storm report | 2,218 | 21% | 13 h | 11 h | 11k |
| May 11, 2022 | No storm report | 1,200 | 12% | 13 h | 13 h | 10k |
| Apr 27, 2021 | No storm report | 5,299 | 51% | 1.5 h | 1.5 h | 7.9k |
| Feb 24, 2019 | No storm report | 1,871 | 18% | 4.2 h | 4.2 h | 7.7k |
| Jan 23, 2020 | No storm report | 5,667 | 55% | 2.0 h | 12 min | 7.3k |
| May 7, 2016 | Thunderstorms | 1,498 | 14% | 8.5 h | 6.5 h | 6.4k |
| Oct 25, 2024 | No storm report | 1,701 | 16% | 3.8 h | 3.5 h | 6.4k |
| May 16, 2025 | Thunderstorms | 510 | 5% | 20 h | – | 5.9k |
| Jul 13, 2016 | Thunderstorms | 793 | 8% | 17 h | 4.0 h | 5.8k |
| Jul 15, 2020 | Tornadoes | 1,484 | 14% | 7.0 h | 4.2 h | 5.7k |
| Mar 31, 2023 | Tornadoes | 3,071 | 30% | 3.5 h | 1.2 h | 5.5k |
| Aug 16, 2022 | No storm report | 1,911 | 18% | 3.5 h | 1.2 h | 5.3k |
| May 19, 2022 | No storm report | 452 | 4% | 11 h | – | 4.7k |
| Feb 2, 2022 | Winter storm | 434 | 4% | 13 h | – | 4.1k |
| Jul 25, 2023 | No storm report | 2,105 | 20% | 4.5 h | 12 h | 3.8k |
| Jun 29, 2023 | Thunderstorms | 812 | 8% | 12 h | 24 h | 3.8k |
| Jun 16, 2019 | No storm report | 1,384 | 13% | 8.5 h | 2.8 h | 3.7k |
| Jan 2, 2022 | No storm report | 424 | 4% | 8.8 h | – | 3.4k |
| Mar 14, 2024 | No storm report | 1,719 | 17% | 2.0 h | 1.8 h | 3.4k |
| Jun 23, 2020 | Flooding | 1,606 | 16% | 5.5 h | 5.2 h | 3.4k |
| Apr 5, 2017 | No storm report | 1,098 | 11% | 3.0 h | 1.5 h | 3.3k |
| Nov 21, 2015 | No storm report | 1,502 | 15% | 2.5 h | 2.0 h | 3.3k |
| Jul 1, 2019 | No storm report | 336 | 3% | 9.0 h | – | 3.0k |
| Jul 31, 2022 | No storm report | 523 | 5% | 5.8 h | 6.0 h | 2.9k |
| Nov 25, 2020 | No storm report | 1,056 | 10% | 3.0 h | 3.0 h | 2.9k |
| Mar 9, 2019 | No storm report | 1,708 | 17% | 3.8 h | 12 min | 2.5k |
| May 22, 2016 | No storm report | 823 | 8% | 5.0 h | 12 min | 2.4k |
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 Montgomery from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 61%
- Thunderstorms 24%
- Winter storm 8.1%
- Tornadoes 4.4%
- Flooding 1.8%
- Heat 0.8%
Who keeps the lights on
Utilities serving Montgomery
As each utility reports to the Energy Information Administration for its whole Illinois territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Ameren Illinois Company | Investor Owned | 287 | 130 | 1.19 | 16.7 | 1.1M |
| M J M Electric Cooperative Inc | IL | 1,945 | 440 | – | 15.4 | 113k |
| Rural Electric Conven Coop | IL | 142 | 87 | 1.56 | 13.0 | 87k |
| Southwestern Electric Coop Inc | Cooperative | 241 | 195 | 1.92 | 15.4 | 24k |
| Shelby Electric Coop, Inc | Cooperative | – | – | – | 21.5 | 9.9k |
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.
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 10,344 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 →