Grundy County Power Outage History
2014–2025 · Illinois
Better than average — fewer or shorter outages than most counties. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jul 16, 2024 | 64 hrs | 7,748 (18%) | Heat |
| Jun 25, 2021 | 8 hrs | 7,310 (17%) | Unnamed event |
| Jun 23, 2015 | 1 hrs | 6,911 (16%) | Tornado |
| Jun 23, 2015 | 1 hrs | 6,901 (16%) | Tornado |
| Jun 23, 2015 | 4 hrs | 6,898 (16%) | Tornado |
Over the 12 years from 2014 to 2025, Grundy County recorded 268 distinct power outage events, averaging 2.8 hours per event.
The single worst outage on record in Grundy County started July 16, 2024 (Heat), lasting 64 hours and leaving up to 7,748 customers without power (18% of the county) at its peak.
June has historically been the worst month for outages in Grundy County, with 64 events recorded during that month across the dataset.
Based on this history, Grundy County earns a Reliability Grade of B, placing it in the 77th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Grundy County's outage profile
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Similar counties in Illinois
Counties with the closest reliability grade and national percentile to Grundy County.
| County | Grade | National percentile |
|---|---|---|
| Moultrie County | B | 77th |
| Hamilton County | B | 77th |
| McDonough County | B | 76th |
| Union County | B | 76th |
| Henry County | B | 78th |
FAQ
How often does power go out in Grundy County?
Between 2014 and 2025, Grundy County recorded 268 outage events, averaging 2.8 hours each.
What is Grundy County's reliability grade?
Grundy County has a Reliability Grade of B, in the 77th national percentile.
What was the worst power outage in Grundy County?
The worst outage on record started July 16, 2024 (Heat), lasting 64 hours and affecting up to 7,748 customers.