Sanilac 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 |
|---|---|---|---|
| May 4, 2018 | 54 hrs | 13,303 (55%) | High Wind |
| Sep 22, 2021 | 122 hrs | 9,280 (39%) | High Wind |
| Jul 20, 2019 | 49 hrs | 8,365 (35%) | Thunderstorm Wind |
| Jun 10, 2020 | 1 hrs | 8,069 (34%) | Tropical Storm Cristobal |
| Aug 3, 2015 | 15 hrs | 7,197 (30%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, Sanilac County recorded 846 distinct power outage events, averaging 4.7 hours per event.
The single worst outage on record in Sanilac County started May 4, 2018 (High Wind), lasting 54 hours and leaving up to 13,303 customers without power (55% of the county) at its peak.
August has historically been the worst month for outages in Sanilac County, with 133 events recorded during that month across the dataset.
Based on this history, Sanilac County earns a Reliability Grade of F, placing it in the 8th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Sanilac County's outage profile
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Similar counties in Michigan
Counties with the closest reliability grade and national percentile to Sanilac County.
| County | Grade | National percentile |
|---|---|---|
| Livingston County | F | 8th |
| Hillsdale County | F | 7th |
| Lake County | F | 7th |
| Gladwin County | F | 8th |
| Mackinac County | F | 7th |
FAQ
How often does power go out in Sanilac County?
Between 2014 and 2025, Sanilac County recorded 846 outage events, averaging 4.7 hours each.
What is Sanilac County's reliability grade?
Sanilac County has a Reliability Grade of F, in the 8th national percentile.
What was the worst power outage in Sanilac County?
The worst outage on record started May 4, 2018 (High Wind), lasting 54 hours and affecting up to 13,303 customers.