Shiawassee County Power Outage History
2014–2025 · Michigan
Worse than average — more frequent or longer outages than most counties. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Mar 16, 2015 | 2 hrs | 11,085 (27%) | Unnamed event |
| Mar 30, 2025 | 107 hrs | 10,186 (25%) | Thunderstorm Wind |
| Aug 25, 2023 | 68 hrs | 7,638 (18%) | Thunderstorm Wind |
| Mar 16, 2015 | 1 hrs | 7,492 (18%) | Unnamed event |
| Oct 20, 2018 | 28 hrs | 6,421 (16%) | Unnamed event |
Over the 12 years from 2014 to 2025, Shiawassee County recorded 417 distinct power outage events, averaging 5.3 hours per event.
The single worst outage on record in Shiawassee County started March 16, 2015, lasting 2 hours and leaving up to 11,085 customers without power (27% of the county) at its peak.
June has historically been the worst month for outages in Shiawassee County, with 65 events recorded during that month across the dataset.
Based on this history, Shiawassee County earns a Reliability Grade of D, placing it in the 36th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Shiawassee County's outage profile
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Similar counties in Michigan
Counties with the closest reliability grade and national percentile to Shiawassee County.
| County | Grade | National percentile |
|---|---|---|
| Menominee County | D | 35th |
| Kent County | D | 35th |
| Huron County | D | 35th |
| Gratiot County | D | 39th |
| Alpena County | D | 34th |
FAQ
How often does power go out in Shiawassee County?
Between 2014 and 2025, Shiawassee County recorded 417 outage events, averaging 5.3 hours each.
What is Shiawassee County's reliability grade?
Shiawassee County has a Reliability Grade of D, in the 36th national percentile.
What was the worst power outage in Shiawassee County?
The worst outage on record started March 16, 2015, lasting 2 hours and affecting up to 11,085 customers.