Lake 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 |
|---|---|---|---|
| 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 |
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).
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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 |
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.