McLean County Power Outage History
2014–2025 · Illinois
Top 20% most reliable nationally — infrequent, short outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Dec 28, 2015 | 57 hrs | 10,089 (10%) | Ice Storm |
| Aug 9, 2018 | 1 hrs | 9,593 (10%) | Unnamed event |
| Jun 14, 2024 | 71 hrs | 8,016 (8%) | Hail |
| May 16, 2025 | 18 hrs | 7,647 (8%) | Thunderstorm Wind |
| Jul 12, 2020 | 40 hrs | 6,980 (7%) | Flash Flood |
Over the 12 years from 2014 to 2025, McLean County recorded 592 distinct power outage events, averaging 2.5 hours per event.
The single worst outage on record in McLean County started December 28, 2015 (Ice Storm), lasting 57 hours and leaving up to 10,089 customers without power (10% of the county) at its peak.
June has historically been the worst month for outages in McLean County, with 82 events recorded during that month across the dataset.
Based on this history, McLean County earns a Reliability Grade of A, placing it in the 81st percentile nationally for grid reliability (higher percentile = more reliable).
Sized for McLean County's outage profile
See more picks in our Best Small Power Stations (Under 1,000Wh) roundup.
Outage-prep kit
See our outage-prep guides.
Similar counties in Illinois
Counties with the closest reliability grade and national percentile to McLean County.
| County | Grade | National percentile |
|---|---|---|
| Greene County | A | 81st |
| DuPage County | A | 80th |
| Montgomery County | A | 80th |
| Kane County | B | 79th |
| Menard County | A | 82nd |
FAQ
How often does power go out in McLean County?
Between 2014 and 2025, McLean County recorded 592 outage events, averaging 2.5 hours each.
What is McLean County's reliability grade?
McLean County has a Reliability Grade of A, in the 81st national percentile.
What was the worst power outage in McLean County?
The worst outage on record started December 28, 2015 (Ice Storm), lasting 57 hours and affecting up to 10,089 customers.