Power outage history
Henderson County Illinois
9.2hours
without power for the average customer in a typical year, 2018–2025
9th most of 101 in Illinois 1.4× 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 Henderson'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 19 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Henderson, 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 |
|---|---|---|---|---|---|---|
| May 7, 2023 | No storm report | 1,819 | 54% | 42 h | 27 h | 40k |
| Jun 10, 2015 | Thunderstorms | 2,014 | 60% | 43 h | 22 h | 38k |
| Sep 26, 2015 | No storm report | 1,859 | 55% | 10 h | 10 h | 19k |
| Dec 28, 2015 | Ice storm | 3,381 | 100% | 42 h | 6.0 h | 19k |
| Nov 10, 2020 | Thunderstorms | 1,261 | 37% | 15 h | 1.0 h | 11k |
| Nov 21, 2015 | No storm report | 2,234 | 66% | 11 h | 2.8 h | 11k |
| Jul 15, 2024 | Thunderstorms | 407 | 12% | 2.5 d | 43 h | 10.0k |
| Jun 20, 2015 | Thunderstorms | 924 | 27% | 20 h | 15 h | 9.2k |
| Jun 18, 2021 | No storm report | 1,420 | 42% | 13 h | 2.8 h | 9.0k |
| Dec 11, 2021 | No storm report | 2,600 | 77% | 8.2 h | 1.0 h | 7.9k |
| May 16, 2024 | No storm report | 1,181 | 35% | 6.5 h | 9.2 h | 7.7k |
| Nov 7, 2025 | No storm report | 1,913 | 57% | 3.8 h | 3.8 h | 7.2k |
| Dec 15, 2021 | Windstorm | 1,439 | 43% | 8.8 h | 4.5 h | 7.0k |
| Jul 26, 2025 | No storm report | 1,375 | 41% | 5.0 h | 5.2 h | 6.9k |
| Feb 27, 2021 | No storm report | 1,419 | 42% | 5.0 h | 5.0 h | 6.6k |
| Oct 23, 2025 | No storm report | 1,915 | 57% | 6.5 h | 12 h | 6.3k |
| Jun 4, 2021 | No storm report | 1,415 | 42% | 5.0 h | 5.0 h | 6.0k |
| Dec 3, 2023 | No storm report | 2,578 | 76% | 2.5 h | 1.8 h | 6.0k |
| Mar 7, 2024 | No storm report | 1,182 | 35% | 6.8 h | 5.2 h | 5.9k |
| Apr 30, 2015 | No storm report | 1,750 | 52% | 3.2 h | 3.2 h | 5.7k |
| Jun 22, 2016 | No storm report | 1,909 | 56% | 18 h | 30 min | 5.1k |
| Jul 16, 2015 | Tornadoes | 1,898 | 56% | 3.2 h | 1.2 h | 4.9k |
| Nov 11, 2015 | No storm report | 1,761 | 52% | 4.0 h | 48 min | 4.8k |
| Oct 22, 2015 | No storm report | 3,381 | 100% | 2.5 h | 1.2 h | 4.8k |
| Jul 19, 2020 | Thunderstorms | 429 | 13% | 22 h | 20 h | 4.5k |
| Mar 15, 2025 | No storm report | 1,192 | 35% | 3.8 h | 4.0 h | 4.5k |
| Jun 7, 2015 | Thunderstorms | 570 | 17% | 9.8 h | 7.2 h | 4.3k |
| Jun 30, 2019 | No storm report | 1,174 | 35% | 5.8 h | 3.0 h | 3.7k |
| Dec 4, 2023 | No storm report | 2,579 | 76% | 1.5 h | 1.2 h | 3.6k |
| Feb 5, 2019 | No storm report | 1,414 | 42% | 2.5 h | 2.5 h | 3.5k |
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 Henderson from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 77%
- Thunderstorms 14%
- Flooding 3.9%
- Windstorm 3.1%
- Winter storm 1.2%
Who keeps the lights on
Utilities serving Henderson
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 |
| McDonough Power Coop | IL | – | – | – | – | 55k |
| Western Illinois Elec Coop | IL | – | – | – | – | 36k |
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 3,381 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 →