Power outage history
LaSalle County Illinois
5.2hours
without power for the average customer in a typical year, 2018–2025
41st most of 101 in Illinois 21% 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 LaSalle'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 22 hours for the average customer. Hatched years have a thin record and are left out of the averages.
LaSalle, 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 | 30,069 | 48% | 4.4 d | 2.6 d | 1.2M |
| Feb 28, 2017 | Tornadoes | 9,860 | 16% | 47 h | 44 h | 133k |
| Aug 11, 2021 | Thunderstorms | 9,828 | 16% | 36 h | 17 h | 112k |
| Nov 25, 2018 | Winter storm | 5,602 | 9% | 43 h | 30 h | 107k |
| Jul 15, 2024 | Thunderstorms | 4,911 | 8% | 16 h | 16 h | 45k |
| Jul 28, 2023 | Tornadoes | 5,471 | 9% | 17 h | 17 h | 42k |
| Jun 14, 2017 | Thunderstorms | 7,332 | 12% | 18 h | 12 h | 41k |
| Jul 15, 2024 | Tornadoes | 3,838 | 6% | 17 h | 12 h | 39k |
| Mar 31, 2023 | Thunderstorms | 2,671 | 4% | 26 h | – | 38k |
| Feb 12, 2019 | Ice storm | 3,445 | 5% | 26 h | 18 h | 37k |
| Aug 12, 2025 | No storm report | 4,207 | 7% | 7.0 h | 6.8 h | 29k |
| Dec 28, 2015 | Winter storm | 2,650 | 4% | 21 h | – | 24k |
| Oct 20, 2018 | No storm report | 2,946 | 5% | 8.5 h | – | 21k |
| Sep 27, 2019 | Flooding | 1,393 | 2% | 23 h | – | 20k |
| Jun 22, 2016 | Tornadoes | 3,927 | 6% | 11 h | 12 h | 18k |
| Mar 7, 2017 | Thunderstorms | 3,336 | 5% | 15 h | 17 h | 16k |
| Jun 30, 2019 | Thunderstorms | 2,180 | 3% | 13 h | – | 16k |
| Jan 4, 2025 | No storm report | 2,057 | 3% | 7.5 h | – | 15k |
| May 17, 2017 | Thunderstorms | 1,471 | 2% | 12 h | – | 15k |
| Jul 11, 2020 | Thunderstorms | 1,521 | 2% | 8.2 h | – | 11k |
| May 27, 2016 | No storm report | 4,183 | 7% | 3.0 h | 1.8 h | 11k |
| Apr 4, 2023 | Thunderstorms | 2,275 | 4% | 6.8 h | – | 9.9k |
| Apr 2, 2016 | Windstorm | 1,848 | 3% | 8.2 h | – | 9.3k |
| Jun 26, 2020 | Thunderstorms | 1,887 | 3% | 6.8 h | – | 8.1k |
| Oct 12, 2022 | No storm report | 4,080 | 6% | 1.8 h | 30 min | 7.1k |
| Apr 5, 2017 | No storm report | 808 | 1% | 8.8 h | – | 6.8k |
| Jul 5, 2019 | No storm report | 2,225 | 4% | 4.0 h | – | 6.6k |
| Oct 26, 2016 | No storm report | 1,214 | 2% | 5.2 h | – | 6.2k |
| Jan 11, 2020 | No storm report | 4,115 | 7% | 1.5 h | 30 min | 6.2k |
| Sep 25, 2023 | No storm report | 2,327 | 4% | 3.0 h | – | 6.1k |
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 LaSalle from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 74%
- No storm on record 13%
- Winter storm 5.4%
- Tornadoes 4.0%
- Ice storm 2.0%
- Flooding 1.0%
- Windstorm 0.5%
Who keeps the lights on
Utilities serving LaSalle
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 |
| 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 |
| City of Oglesby | IL | – | – | – | – | 14k |
| City of Peru | Municipal | – | – | – | 12.5 | 4.8k |
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 63,017 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 →