LaSalle CountyPower Outage History
What this grade means
Average — typical outage frequency and duration nationally. This county sits in the middle of the national distribution — its outage frequency and duration over the past 12 years are close to the nationwide median, neither notably better nor worse than most other US counties. A typical amount of backup-power preparedness is reasonable here.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Aug 10, 2020 | 126 hrs | 30,069 (46%) | Thunderstorm Wind |
| Feb 28, 2017 | 60 hrs | 9,860 (15%) | Tornado |
| Aug 11, 2021 | 19 hrs | 9,828 (15%) | Thunderstorm Wind |
| Jun 14, 2017 | 27 hrs | 7,332 (11%) | Thunderstorm Wind |
| Oct 25, 2024 | <1 hr | 7,019 (11%) | Drought |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for LaSalle County, Illinois that day.
Over the 12 years from 2014 to 2025, LaSalle County recorded 654 distinct power outage events, averaging 2.8 hours per event.
The single worst outage on record in LaSalle County started August 10, 2020 (Thunderstorm Wind), lasting 126 hours and leaving up to 30,069 customers without power (46% of the county) at its peak.
June has historically been the worst month for outages in LaSalle County, with 86 events recorded during that month across the dataset.
Based on this history, LaSalle County earns a Reliability Grade of C, placing it in the 49th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Illinois
Counties with the closest reliability grade and national percentile to LaSalle County.
| County | Grade | National percentile |
|---|---|---|
| Calhoun County | C | 49th |
| Logan County | C | 50th |
| Jo Daviess County | C | 50th |
| Christian County | C | 48th |
| Knox County | C | 50th |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
FAQ
How often does power go out in LaSalle County?
Between 2014 and 2025, LaSalle County recorded 654 outage events, averaging 2.8 hours each.
What is LaSalle County's reliability grade?
LaSalle County has a Reliability Grade of C, in the 49th national percentile.
What was the worst power outage in LaSalle County?
The worst outage on record started August 10, 2020 (Thunderstorm Wind), lasting 126 hours and affecting up to 30,069 customers.