Calhoun 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 |
|---|---|---|---|
| Jun 10, 2020 | 123 hrs | 30,725 (33%) | Thunderstorm Wind |
| Feb 23, 2023 | 118 hrs | 25,676 (28%) | Ice Storm |
| Jun 10, 2020 | 1 hrs | 22,604 (24%) | Thunderstorm Wind |
| May 16, 2025 | 119 hrs | 21,889 (24%) | Thunderstorm Wind |
| Aug 29, 2022 | 5 hrs | 21,753 (23%) | Thunderstorm Wind |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Calhoun County, Michigan that day.
Over the 12 years from 2014 to 2025, Calhoun County recorded 840 distinct power outage events, averaging 4.7 hours per event.
The single worst outage on record in Calhoun County started June 10, 2020 (Thunderstorm Wind), lasting 123 hours and leaving up to 30,725 customers without power (33% of the county) at its peak.
June has historically been the worst month for outages in Calhoun County, with 150 events recorded during that month across the dataset.
Based on this history, Calhoun County earns a Reliability Grade of F, placing it in the 16th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Michigan
Counties with the closest reliability grade and national percentile to Calhoun County.
| County | Grade | National percentile |
|---|---|---|
| Lapeer County | F | 16th |
| Mecosta County | F | 16th |
| Barry County | F | 16th |
| St. Clair County | F | 17th |
| Kalamazoo County | F | 17th |
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 Calhoun County?
Between 2014 and 2025, Calhoun County recorded 840 outage events, averaging 4.7 hours each.
What is Calhoun County's reliability grade?
Calhoun County has a Reliability Grade of F, in the 16th national percentile.
What was the worst power outage in Calhoun County?
The worst outage on record started June 10, 2020 (Thunderstorm Wind), lasting 123 hours and affecting up to 30,725 customers.