Power outage history
Winnebago County Illinois
4.0hours
without power for the average customer in a typical year, 2018–2025
56th most of 101 in Illinois 39% 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 Winnebago'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 9.6 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Winnebago, 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 | Tornadoes | 24,445 | 20% | 4.2 d | 2.7 d | 892k |
| Feb 22, 2023 | Ice storm | 23,635 | 20% | 2.2 d | 43 h | 561k |
| Jul 15, 2024 | Thunderstorms | 17,055 | 14% | 2.9 d | 2.6 d | 420k |
| Mar 31, 2023 | Tornadoes | 14,187 | 12% | 45 h | 34 h | 227k |
| Jun 28, 2017 | Thunderstorms | 14,324 | 12% | 26 h | 24 h | 185k |
| Jul 21, 2017 | Flooding | 11,027 | 9% | 28 h | 25 h | 154k |
| Nov 10, 2020 | Thunderstorms | 11,519 | 10% | 27 h | 25 h | 148k |
| Aug 10, 2021 | Thunderstorms | 7,882 | 7% | 25 h | 27 h | 80k |
| Jun 30, 2019 | Thunderstorms | 8,795 | 7% | 24 h | 25 h | 78k |
| Jul 19, 2017 | Thunderstorms | 4,825 | 4% | 19 h | – | 56k |
| Mar 14, 2025 | Thunderstorms | 8,091 | 7% | 13 h | 12 h | 48k |
| Jul 26, 2023 | Thunderstorms | 8,778 | 7% | 12 h | 12 h | 47k |
| May 17, 2017 | Thunderstorms | 4,205 | 3% | 18 h | – | 42k |
| Jul 20, 2019 | Thunderstorms | 7,737 | 6% | 13 h | 12 h | 40k |
| Aug 28, 2018 | Thunderstorms | 4,370 | 4% | 12 h | – | 32k |
| Jul 28, 2023 | Heat | 4,485 | 4% | 9.5 h | – | 28k |
| Jun 24, 2023 | Thunderstorms | 4,389 | 4% | 10 h | – | 27k |
| Feb 7, 2019 | No storm report | 4,425 | 4% | 9.0 h | – | 24k |
| Dec 16, 2021 | Windstorm | 3,270 | 3% | 9.0 h | – | 19k |
| Jul 10, 2025 | Thunderstorms | 3,059 | 3% | 8.8 h | – | 18k |
| May 21, 2024 | Thunderstorms | 2,519 | 2% | 9.8 h | – | 14k |
| Jul 13, 2015 | Thunderstorms | 3,672 | 3% | 5.0 h | – | 12k |
| Mar 5, 2022 | Thunderstorms | 2,005 | 2% | 5.5 h | – | 10k |
| Jun 16, 2024 | Thunderstorms | 1,955 | 2% | 5.8 h | – | 9.0k |
| Jul 2, 2019 | Flooding | 3,141 | 3% | 4.5 h | – | 9.0k |
| Mar 7, 2017 | No storm report | 2,568 | 2% | 5.0 h | – | 8.6k |
| Jul 13, 2024 | Flooding | 3,846 | 3% | 3.5 h | – | 8.5k |
| Sep 2, 2018 | No storm report | 3,805 | 3% | 2.5 h | – | 7.7k |
| Aug 24, 2021 | Thunderstorms | 2,653 | 2% | 3.8 h | – | 7.6k |
| Jan 8, 2020 | No storm report | 2,720 | 2% | 2.8 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 Winnebago from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Tornadoes 39%
- Thunderstorms 35%
- Ice storm 20%
- No storm on record 3.2%
- Heat 1.1%
- Windstorm 1.1%
- Flooding 1.0%
Who keeps the lights on
Utilities serving Winnebago
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 |
|---|---|---|---|---|---|---|
| Commonwealth Edison Co | Investor Owned | 77 | 38 | 0.66 | 17.7 | 3.8M |
| Rock Energy Cooperative | Cooperative | 16 | 15 | 0.40 | 14.9 | 9.4k |
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 120,789 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 →