Sanilac CountyPower Outage History
What this grade means
Bottom 20% least reliable nationally — frequent and/or long outages. This county ranks in the least reliable fifth of all US counties in our dataset: some combination of frequent outages, long restoration times, or customers affected puts it near the bottom nationally. Backup power is worth prioritizing here rather than treating it as optional.
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 hr | 8,069 (34%) | Tropical Storm Cristobal |
| Aug 3, 2015 | 15 hrs | 7,197 (30%) | Thunderstorm Wind |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Sanilac County, Michigan that day.
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).
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 |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
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.