Calhoun 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 |
|---|---|---|---|
| Jun 10, 2020 | 123 hrs | 30,725 (33%) | Thunderstorm Wind |
| Feb 23, 2023 | 118 hrs | 25,676 (28%) | Ice Storm |
| Jun 10, 2020 | 1 hrs | 22,604 (24%) | Thunderstorm Wind |
| May 16, 2025 | 119 hrs | 21,889 (24%) | Thunderstorm Wind |
| Aug 29, 2022 | 5 hrs | 21,753 (23%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, Calhoun County recorded 840 distinct power outage events, averaging 4.7 hours per event.
The single worst outage on record in Calhoun County started June 10, 2020 (Thunderstorm Wind), lasting 123 hours and leaving up to 30,725 customers without power (33% of the county) at its peak.
June has historically been the worst month for outages in Calhoun County, with 150 events recorded during that month across the dataset.
Based on this history, Calhoun County earns a Reliability Grade of F, placing it in the 16th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Calhoun County's outage profile
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Similar counties in Michigan
Counties with the closest reliability grade and national percentile to Calhoun County.
| County | Grade | National percentile |
|---|---|---|
| Lapeer County | F | 16th |
| Mecosta County | F | 16th |
| Barry County | F | 16th |
| St. Clair County | F | 17th |
| Kalamazoo County | F | 17th |
FAQ
How often does power go out in Calhoun County?
Between 2014 and 2025, Calhoun County recorded 840 outage events, averaging 4.7 hours each.
What is Calhoun County's reliability grade?
Calhoun County has a Reliability Grade of F, in the 16th national percentile.
What was the worst power outage in Calhoun County?
The worst outage on record started June 10, 2020 (Thunderstorm Wind), lasting 123 hours and affecting up to 30,725 customers.