Lake County Power Outage History
2014–2025 · Illinois
Top 20% most reliable nationally — infrequent, short 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 | 33 hrs | 42,379 (7%) | Drought |
| Aug 10, 2020 | 12 hrs | 28,909 (5%) | Thunderstorm Wind |
| Aug 27, 2024 | 46 hrs | 23,670 (4%) | Thunderstorm Wind |
| Nov 26, 2018 | 9 hrs | 20,513 (4%) | Winter Storm |
| Nov 26, 2018 | 57 hrs | 20,297 (3%) | Winter Storm |
Over the 12 years from 2014 to 2025, Lake County recorded 1,944 distinct power outage events, averaging 1.8 hours per event.
The single worst outage on record in Lake County started August 11, 2021 (Drought), lasting 33 hours and leaving up to 42,379 customers without power (7% of the county) at its peak.
July has historically been the worst month for outages in Lake County, with 219 events recorded during that month across the dataset.
Based on this history, Lake County earns a Reliability Grade of A, placing it in the 92nd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Lake County's outage profile
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Outage-prep kit
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Similar counties in Illinois
Counties with the closest reliability grade and national percentile to Lake County.
| County | Grade | National percentile |
|---|---|---|
| Cass County | A | 92nd |
| Clay County | A | 91st |
| Kendall County | A | 93rd |
| Edwards County | A | 91st |
| Schuyler County | A | 91st |
FAQ
How often does power go out in Lake County?
Between 2014 and 2025, Lake County recorded 1,944 outage events, averaging 1.8 hours each.
What is Lake County's reliability grade?
Lake County has a Reliability Grade of A, in the 92nd national percentile.
What was the worst power outage in Lake County?
The worst outage on record started August 11, 2021 (Drought), lasting 33 hours and affecting up to 42,379 customers.