Power outage history
Tazewell County Illinois
2.9hours
without power for the average customer in a typical year, 2018–2025
74th most of 101 in Illinois 56% 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 Tazewell's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2024 was the worst well-recorded year, at 6.2 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Tazewell, 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 |
|---|---|---|---|---|---|---|
| Dec 28, 2015 | Ice storm | 18,680 | 23% | 2.4 d | 47 h | 412k |
| Jul 15, 2024 | Thunderstorms | 12,113 | 15% | 47 h | 42 h | 284k |
| Jan 1, 2021 | Ice storm | 4,949 | 6% | 33 h | 18 h | 93k |
| Jun 19, 2021 | Thunderstorms | 8,615 | 11% | 20 h | 17 h | 74k |
| May 7, 2023 | Thunderstorms | 8,119 | 10% | 20 h | 20 h | 54k |
| Jun 10, 2015 | Thunderstorms | 5,639 | 7% | 13 h | 11 h | 35k |
| Aug 10, 2020 | Thunderstorms | 3,552 | 4% | 18 h | – | 31k |
| Jun 29, 2023 | Thunderstorms | 3,719 | 5% | 15 h | – | 30k |
| Jan 3, 2021 | No storm report | 2,789 | 3% | 19 h | – | 28k |
| Jul 11, 2020 | Thunderstorms | 1,393 | 2% | 19 h | – | 22k |
| Apr 2, 2016 | Windstorm | 3,159 | 4% | 7.0 h | – | 19k |
| Jun 25, 2024 | Thunderstorms | 4,380 | 5% | 6.8 h | 13 h | 15k |
| Oct 10, 2016 | No storm report | 1,395 | 2% | 10 h | – | 14k |
| Jan 4, 2021 | No storm report | 2,679 | 3% | 9.5 h | – | 12k |
| Feb 24, 2019 | No storm report | 1,403 | 2% | 8.5 h | – | 12k |
| Apr 1, 2024 | No storm report | 6,197 | 8% | 3.2 h | 3.2 h | 10k |
| Aug 16, 2024 | Thunderstorms | 1,267 | 2% | 8.8 h | – | 10k |
| Mar 15, 2021 | No storm report | 1,819 | 2% | 9.0 h | – | 10k |
| Dec 14, 2025 | Winter storm | 1,216 | 2% | 8.8 h | – | 10k |
| Jul 17, 2015 | Tornadoes | 1,705 | 2% | 8.2 h | – | 9.9k |
| Jan 5, 2021 | No storm report | 1,576 | 2% | 9.2 h | – | 9.5k |
| Mar 5, 2022 | Thunderstorms | 2,816 | 3% | 6.5 h | – | 9.5k |
| Feb 28, 2017 | No storm report | 1,758 | 2% | 5.5 h | – | 9.1k |
| Mar 14, 2025 | Thunderstorms | 1,958 | 2% | 5.5 h | – | 9.1k |
| Aug 28, 2024 | Heat | 2,054 | 3% | 7.2 h | – | 8.8k |
| May 28, 2019 | Thunderstorms | 4,413 | 5% | 5.5 h | 5.0 h | 8.4k |
| Jan 30, 2019 | Winter storm | 1,193 | 1% | 7.2 h | – | 8.4k |
| May 21, 2024 | Windstorm | 1,965 | 2% | 5.2 h | – | 8.0k |
| Aug 2, 2022 | Thunderstorms | 1,575 | 2% | 4.8 h | – | 7.3k |
| Jul 24, 2016 | Thunderstorms | 1,496 | 2% | 6.0 h | – | 7.2k |
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 Tazewell from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 59%
- No storm on record 26%
- Ice storm 9.5%
- Winter storm 2.1%
- Heat 0.9%
- Windstorm 0.9%
- Tornadoes 0.7%
Who keeps the lights on
Utilities serving Tazewell
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 |
| Corn Belt Energy Corporation | Cooperative | 1,365 | 155 | 7.65 | 15.6 | 35k |
| Menard Electric Coop | Cooperative | 186 | 161 | 2.27 | 19.4 | 9.0k |
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 80,878 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 →