Power outage history
Jo Daviess County Illinois
4.3hours
without power for the average customer in a typical year, 2018–2025
52nd most of 101 in Illinois 34% 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 Jo Daviess'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 11 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Jo Daviess, 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 21, 2024 | Thunderstorms | 3,091 | 28% | 46 h | 27 h | 68k |
| Feb 22, 2023 | Ice storm | 3,239 | 29% | 2.7 d | 33 h | 58k |
| Jul 15, 2024 | Thunderstorms | 1,627 | 14% | 2.4 d | 2.0 d | 32k |
| Jul 13, 2018 | Thunderstorms | 1,588 | 14% | 34 h | 25 h | 24k |
| Jul 11, 2025 | Thunderstorms | 1,814 | 16% | 22 h | 16 h | 17k |
| Jul 28, 2023 | Thunderstorms | 1,861 | 17% | 38 h | 22 h | 17k |
| Feb 19, 2016 | Windstorm | 1,710 | 15% | 6.8 h | 1.0 h | 11k |
| Jun 28, 2017 | Thunderstorms | 1,887 | 17% | 16 h | 6.5 h | 11k |
| Mar 26, 2019 | No storm report | 3,618 | 32% | 5.0 h | 1.5 h | 9.1k |
| Jul 19, 2017 | Thunderstorms | 818 | 7% | 25 h | 23 h | 8.8k |
| Jan 10, 2020 | Winter storm | 531 | 5% | 36 h | – | 7.6k |
| Dec 15, 2022 | No storm report | 2,860 | 25% | 2.5 h | 2.8 h | 4.1k |
| Aug 5, 2019 | No storm report | 1,201 | 11% | 7.5 h | 7.5 h | 4.1k |
| Jun 30, 2019 | Thunderstorms | 434 | 4% | 14 h | – | 3.8k |
| Apr 7, 2020 | No storm report | 3,170 | 28% | 2.0 h | 30 min | 3.5k |
| Mar 4, 2024 | No storm report | 1,069 | 10% | 3.2 h | 7.8 h | 3.5k |
| Jun 5, 2016 | No storm report | 1,701 | 15% | 2.0 h | 2.0 h | 3.4k |
| Apr 14, 2018 | No storm report | 1,037 | 9% | 7.0 h | 6.0 h | 3.2k |
| Dec 16, 2021 | Windstorm | 512 | 5% | 12 h | – | 3.2k |
| May 17, 2020 | No storm report | 737 | 7% | 5.2 h | 5.2 h | 2.8k |
| Jul 15, 2018 | No storm report | 419 | 4% | 6.5 h | – | 2.7k |
| Feb 3, 2019 | No storm report | 3,416 | 30% | 1.0 h | 5.0 h | 2.6k |
| Apr 15, 2017 | No storm report | 725 | 6% | 4.5 h | 4.0 h | 2.5k |
| May 12, 2025 | No storm report | 1,704 | 15% | 1.5 h | 5.0 h | 2.2k |
| Jul 27, 2023 | No storm report | 1,063 | 9% | 2.0 h | 3.0 h | 2.1k |
| Jun 8, 2020 | No storm report | 738 | 7% | 3.5 h | 1.5 h | 2.1k |
| Jul 24, 2022 | Thunderstorms | 588 | 5% | 4.0 h | 1.5 h | 2.0k |
| Jul 27, 2023 | No storm report | 1,788 | 16% | 1.5 h | 8.2 h | 2.0k |
| Oct 15, 2023 | No storm report | 474 | 4% | 3.8 h | – | 1.8k |
| May 26, 2015 | No storm report | 1,706 | 15% | 1.0 h | 1.0 h | 1.7k |
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 Jo Daviess from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 51%
- No storm on record 26%
- Ice storm 18%
- Winter storm 3.8%
- Windstorm 1.0%
Who keeps the lights on
Utilities serving Jo Daviess
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 |
| Jo-Carroll Energy, Inc | Cooperative | 138 | 37 | 0.54 | 20.5 | 17k |
| Scenic Rivers Energy Coop | Cooperative | – | – | – | 15.1 | 12 |
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
- Stephenson 7.2 h
- Carroll 5.9 h
- Jo Daviess (this county) 4.3 h
- Jackson, IA 2.5 h
- Grant, WI 1.4 h
- Dubuque, IA 1.4 h
- Lafayette, WI 1.3 h
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 11,242 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 →