Hamilton CountyPower Outage History
What this grade means
(How grades are calculated)Better than average — fewer or shorter outages than most counties. This county's outage history is better than the national median: recorded outages are less frequent and/or shorter in duration than a typical US county experienced over the same 12-year period. It isn't in the top tier nationally, but its track record points to lower-than-average outage risk.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Apr 5, 2023 | <1 hr | 2,205 (43%) | Strong Wind |
| Nov 28, 2024 | 1 hrs | 1,668 (32%) | Unnamed event |
| Aug 1, 2024 | 9 hrs | 1,136 (22%) | Hail |
| Feb 7, 2017 | 1 hrs | 918 (18%) | Unnamed event |
| Aug 11, 2020 | 23 hrs | 779 (15%) | Heat |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Hamilton County, Illinois that day.
Over the 11 years from 2015 to 2025, Hamilton County recorded 335 distinct power outage events, averaging 2.0 hours per event.
The single worst outage on record in Hamilton County started April 5, 2023 (Strong Wind), lasting less than 1 hour and leaving up to 2,205 customers without power (43% of the county) at its peak.
June has historically been the worst month for outages in Hamilton County, with 50 events recorded during that month across the dataset.
Based on this history, Hamilton County earns a Reliability Grade of B, placing it in the 77th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Illinois
Counties with the closest reliability grade and national percentile to Hamilton County.
| County | Grade | National percentile |
|---|---|---|
| Grundy County | B | 77th |
| Moultrie County | B | 77th |
| McDonough County | B | 76th |
| Henry County | B | 78th |
| Union County | B | 76th |
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 Hamilton County?
Between 2015 and 2025, Hamilton County recorded 335 outage events, averaging 2.0 hours each.
What is Hamilton County's reliability grade?
Hamilton County has a Reliability Grade of B, in the 77th national percentile.
What was the worst power outage in Hamilton County?
The worst outage on record started April 5, 2023 (Strong Wind), lasting less than 1 hour and affecting up to 2,205 customers.