Cass County Power Outage History
2015–2025 · 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 |
|---|---|---|---|
| Apr 10, 2023 | 1 hrs | 4,486 (55%) | Unnamed event |
| Nov 28, 2016 | 2 hrs | 1,930 (24%) | Unnamed event |
| Nov 1, 2024 | 1 hrs | 1,919 (24%) | Unnamed event |
| Dec 1, 2018 | 5 hrs | 1,631 (20%) | Tornado |
| May 15, 2015 | 1 hrs | 1,523 (19%) | Unnamed event |
Over the 11 years from 2015 to 2025, Cass County recorded 115 distinct power outage events, averaging 2.3 hours per event.
The single worst outage on record in Cass County started April 10, 2023, lasting 1 hours and leaving up to 4,486 customers without power (55% of the county) at its peak.
June has historically been the worst month for outages in Cass County, with 22 events recorded during that month across the dataset.
Based on this history, Cass County earns a Reliability Grade of A, placing it in the 92nd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Cass County's outage profile
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Similar counties in Illinois
Counties with the closest reliability grade and national percentile to Cass County.
| County | Grade | National percentile |
|---|---|---|
| Lake County | A | 92nd |
| Kendall County | A | 93rd |
| Clay County | A | 91st |
| Edwards County | A | 91st |
| Schuyler County | A | 91st |
FAQ
How often does power go out in Cass County?
Between 2015 and 2025, Cass County recorded 115 outage events, averaging 2.3 hours each.
What is Cass County's reliability grade?
Cass County has a Reliability Grade of A, in the 92nd national percentile.
What was the worst power outage in Cass County?
The worst outage on record started April 10, 2023, lasting 1 hours and affecting up to 4,486 customers.