Lake 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 |
|---|---|---|---|
| Aug 11, 2021 | 20 hrs | 6,444 (60%) | Unnamed event |
| Mar 15, 2025 | 34 hrs | 6,361 (59%) | Unnamed event |
| Sep 7, 2021 | 80 hrs | 6,282 (58%) | Hail |
| Aug 27, 2024 | 74 hrs | 6,076 (56%) | Thunderstorm Wind |
| Dec 24, 2015 | 66 hrs | 5,604 (52%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Lake County, Michigan that day.
Over the 12 years from 2014 to 2025, Lake County recorded 997 distinct power outage events, averaging 3.2 hours per event.
The single worst outage on record in Lake County started August 11, 2021, lasting 20 hours and leaving up to 6,444 customers without power (60% of the county) at its peak.
November has historically been the worst month for outages in Lake County, with 112 events recorded during that month across the dataset.
Based on this history, Lake County earns a Reliability Grade of F, placing it in the 7th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Michigan
Counties with the closest reliability grade and national percentile to Lake County.
| County | Grade | National percentile |
|---|---|---|
| Hillsdale County | F | 7th |
| Sanilac County | F | 8th |
| Livingston County | F | 8th |
| Mackinac County | F | 7th |
| Missaukee 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 Lake County?
Between 2014 and 2025, Lake County recorded 997 outage events, averaging 3.2 hours each.
What is Lake County's reliability grade?
Lake County has a Reliability Grade of F, in the 7th national percentile.
What was the worst power outage in Lake County?
The worst outage on record started August 11, 2021, lasting 20 hours and affecting up to 6,444 customers.