Power outage history
Henry County Illinois
3.5hours
without power for the average customer in a typical year, 2018–2025
63rd most of 101 in Illinois 46% 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 Henry's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2020 was the worst well-recorded year, at 9.3 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Henry, 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 |
|---|---|---|---|---|---|---|
| Aug 10, 2020 | Thunderstorms | 6,594 | 16% | 3.9 d | 3.1 d | 270k |
| Jul 15, 2024 | Tornadoes | 5,922 | 14% | 2.5 d | 46 h | 177k |
| Dec 28, 2015 | Winter storm | 2,286 | 6% | 43 h | 32 h | 62k |
| Mar 31, 2023 | Tornadoes | 5,312 | 13% | 27 h | 25 h | 55k |
| Jan 21, 2024 | No storm report | 2,890 | 7% | 23 h | 16 h | 32k |
| Apr 4, 2023 | Tornadoes | 2,381 | 6% | 17 h | 16 h | 30k |
| Jul 11, 2020 | Thunderstorms | 3,846 | 9% | 14 h | 14 h | 26k |
| Dec 13, 2025 | No storm report | 2,973 | 7% | 11 h | 8.0 h | 22k |
| Aug 23, 2015 | No storm report | 2,408 | 6% | 9.0 h | 6.8 h | 21k |
| Feb 12, 2019 | Ice storm | 1,029 | 3% | 21 h | – | 15k |
| Mar 14, 2024 | No storm report | 2,474 | 6% | 7.2 h | 3.5 h | 14k |
| Jan 11, 2020 | No storm report | 4,035 | 10% | 6.0 h | 4.0 h | 13k |
| Jul 14, 2021 | No storm report | 2,456 | 6% | 5.5 h | 48 min | 11k |
| Nov 30, 2015 | No storm report | 1,461 | 4% | 6.5 h | – | 9.3k |
| Apr 18, 2016 | No storm report | 1,436 | 4% | 6.0 h | – | 8.6k |
| Aug 11, 2019 | No storm report | 1,233 | 3% | 6.8 h | – | 8.3k |
| Nov 9, 2025 | No storm report | 1,447 | 4% | 5.2 h | – | 7.6k |
| Jan 5, 2021 | No storm report | 1,827 | 4% | 4.0 h | – | 6.9k |
| Apr 24, 2015 | No storm report | 2,305 | 6% | 3.0 h | 6.8 h | 6.6k |
| Dec 16, 2016 | No storm report | 1,682 | 4% | 4.0 h | – | 6.3k |
| Jun 3, 2025 | No storm report | 1,893 | 5% | 5.0 h | – | 6.3k |
| Jun 11, 2021 | No storm report | 1,236 | 3% | 4.8 h | – | 5.9k |
| Jul 7, 2021 | No storm report | 1,696 | 4% | 4.5 h | – | 5.8k |
| Oct 31, 2024 | No storm report | 1,504 | 4% | 4.0 h | – | 5.8k |
| May 5, 2015 | No storm report | 1,442 | 4% | 4.0 h | – | 5.8k |
| Jul 19, 2020 | Thunderstorms | 1,453 | 4% | 9.0 h | – | 5.7k |
| Mar 14, 2025 | Thunderstorms | 1,945 | 5% | 4.2 h | – | 5.6k |
| Nov 8, 2025 | No storm report | 1,642 | 4% | 3.2 h | – | 5.3k |
| May 11, 2021 | No storm report | 1,448 | 4% | 3.5 h | – | 5.1k |
| Aug 13, 2022 | No storm report | 805 | 2% | 6.2 h | – | 5.0k |
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 Henry from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 37%
- No storm on record 30%
- Tornadoes 29%
- Winter storm 2.0%
- Ice storm 1.6%
Who keeps the lights on
Utilities serving Henry
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 |
| MidAmerican Energy Co | Investor Owned | 304 | 143 | 1.87 | 10.0 | 73k |
| Corn Belt Energy Corporation | Cooperative | 1,365 | 155 | 7.65 | 15.6 | 35k |
| City of Geneseo | IL | – | – | – | – | 28k |
| Jo-Carroll Energy, Inc | Cooperative | 138 | 37 | 0.54 | 20.5 | 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 40,978 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 →