Calhoun CountyPower Outage History
2014–2025 · Illinois
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 |
|---|---|---|---|
| Dec 23, 2015 | 1 hrs | 1,391 (52%) | Unnamed event |
| Dec 26, 2016 | 2 hrs | 1,373 (51%) | Unnamed event |
| Jun 2, 2019 | 2 hrs | 1,121 (42%) | Thunderstorm Wind |
| May 16, 2025 | 2 hrs | 1,114 (41%) | Unnamed event |
| Nov 21, 2015 | 3 hrs | 1,076 (40%) | Unnamed event |
Over the 12 years from 2014 to 2025, Calhoun County recorded 275 distinct power outage events, averaging 6.0 hours per event.
The single worst outage on record in Calhoun County started December 23, 2015, lasting 1 hours and leaving up to 1,391 customers without power (52% of the county) at its peak.
July has historically been the worst month for outages in Calhoun County, with 62 events recorded during that month across the dataset.
Based on this history, Calhoun County earns a Reliability Grade of C, placing it in the 49th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Calhoun County's outage profile
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Read our mission →Similar counties in Illinois
Counties with the closest reliability grade and national percentile to Calhoun County.
| County | Grade | National percentile |
|---|---|---|
| LaSalle County | C | 49th |
| Logan County | C | 50th |
| Jo Daviess County | C | 50th |
| Knox County | C | 50th |
| Christian County | C | 48th |
Most reliable counties in Illinois
The top 3 counties in Illinois by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Wabash County | A | 97th |
| Massac County | A | 94th |
| Kendall County | A | 93rd |
Least reliable counties in Illinois
The bottom 3 counties in Illinois by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Mercer County | F | 11th |
| Stark County | F | 13th |
| Henderson County | F | 19th |
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 Calhoun County?
Between 2014 and 2025, Calhoun County recorded 275 outage events, averaging 6.0 hours each.
What is Calhoun County's reliability grade?
Calhoun County has a Reliability Grade of C, in the 49th national percentile.
What was the worst power outage in Calhoun County?
The worst outage on record started December 23, 2015, lasting 1 hours and affecting up to 1,391 customers.