Cass County Power Outage History
2014–2025 · Michigan
Bottom 20% least reliable nationally — frequent and/or long outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Mar 30, 2025 | 120 hrs | 11,912 (57%) | Thunderstorm Wind |
| Jun 14, 2022 | 91 hrs | 8,698 (42%) | Thunderstorm Wind |
| Apr 28, 2022 | 3 hrs | 6,562 (32%) | Unnamed event |
| Jan 1, 2021 | 71 hrs | 5,837 (28%) | Winter Weather |
| Aug 29, 2022 | 22 hrs | 5,825 (28%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, Cass County recorded 2,777 distinct power outage events, averaging 3.3 hours per event.
The single worst outage on record in Cass County started March 30, 2025 (Thunderstorm Wind), lasting 120 hours and leaving up to 11,912 customers without power (57% of the county) at its peak.
June has historically been the worst month for outages in Cass County, with 368 events recorded during that month across the dataset.
Based on this history, Cass County earns a Reliability Grade of F, placing it in the 9th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Michigan
Counties with the closest reliability grade and national percentile to Cass County.
| County | Grade | National percentile |
|---|---|---|
| Antrim County | F | 9th |
| Gladwin County | F | 8th |
| Livingston County | F | 8th |
| Sanilac County | F | 8th |
| Monroe County | F | 9th |
FAQ
How often does power go out in Cass County?
Between 2014 and 2025, Cass County recorded 2,777 outage events, averaging 3.3 hours each.
What is Cass County's reliability grade?
Cass County has a Reliability Grade of F, in the 9th national percentile.
What was the worst power outage in Cass County?
The worst outage on record started March 30, 2025 (Thunderstorm Wind), lasting 120 hours and affecting up to 11,912 customers.