Iosco 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 |
|---|---|---|---|
| Jul 19, 2020 | 55 hrs | 9,443 (66%) | Thunderstorm Wind |
| Apr 29, 2025 | 32 hrs | 8,777 (61%) | Unnamed event |
| Nov 5, 2022 | 20 hrs | 7,660 (53%) | Unnamed event |
| Nov 6, 2022 | 59 hrs | 7,026 (49%) | Unnamed event |
| Dec 16, 2021 | 82 hrs | 6,309 (44%) | High Wind |
Over the 12 years from 2014 to 2025, Iosco County recorded 773 distinct power outage events, averaging 5.3 hours per event.
The single worst outage on record in Iosco County started July 19, 2020 (Thunderstorm Wind), lasting 55 hours and leaving up to 9,443 customers without power (66% of the county) at its peak.
June has historically been the worst month for outages in Iosco County, with 94 events recorded during that month across the dataset.
Based on this history, Iosco County earns a Reliability Grade of F, placing it in the 3rd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Iosco County's outage profile
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Similar counties in Michigan
Counties with the closest reliability grade and national percentile to Iosco County.
| County | Grade | National percentile |
|---|---|---|
| Arenac County | F | 3rd |
| Cheboygan County | F | 3rd |
| Otsego County | F | 4th |
| Crawford County | F | 4th |
| Clare County | F | 2nd |
FAQ
How often does power go out in Iosco County?
Between 2014 and 2025, Iosco County recorded 773 outage events, averaging 5.3 hours each.
What is Iosco County's reliability grade?
Iosco County has a Reliability Grade of F, in the 3rd national percentile.
What was the worst power outage in Iosco County?
The worst outage on record started July 19, 2020 (Thunderstorm Wind), lasting 55 hours and affecting up to 9,443 customers.