St. Clair 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 |
|---|---|---|---|
| Sep 22, 2021 | 108 hrs | 30,637 (38%) | High Wind |
| May 4, 2018 | 54 hrs | 25,132 (32%) | High Wind |
| Feb 1, 2022 | 5 hrs | 15,385 (19%) | Lake-Effect Snow |
| Mar 4, 2023 | 97 hrs | 13,776 (17%) | Heavy Snow |
| Jul 20, 2023 | 75 hrs | 12,778 (16%) | Hail |
Over the 12 years from 2014 to 2025, St. Clair County recorded 1,086 distinct power outage events, averaging 4.1 hours per event.
The single worst outage on record in St. Clair County started September 22, 2021 (High Wind), lasting 108 hours and leaving up to 30,637 customers without power (38% of the county) at its peak.
August has historically been the worst month for outages in St. Clair County, with 141 events recorded during that month across the dataset.
Based on this history, St. Clair County earns a Reliability Grade of F, placing it in the 17th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for St. Clair County's outage profile
See more picks in our Best Dual-Fuel Portable Generators for Power Outages roundup.
Champion Power Equipment 4375-Watt Dual Fuel RV Ready Portable Generator with Free 3-Year Warranty
Outage-prep kit
See our outage-prep guides or the Michigan storm prep checklist.
Similar counties in Michigan
Counties with the closest reliability grade and national percentile to St. Clair County.
| County | Grade | National percentile |
|---|---|---|
| Barry County | F | 16th |
| Lapeer County | F | 16th |
| Kalamazoo County | F | 17th |
| Calhoun County | F | 16th |
| Mecosta County | F | 16th |
FAQ
How often does power go out in St. Clair County?
Between 2014 and 2025, St. Clair County recorded 1,086 outage events, averaging 4.1 hours each.
What is St. Clair County's reliability grade?
St. Clair County has a Reliability Grade of F, in the 17th national percentile.
What was the worst power outage in St. Clair County?
The worst outage on record started September 22, 2021 (High Wind), lasting 108 hours and affecting up to 30,637 customers.