Lake County Power Outage History
2018–2025 · California
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 |
|---|---|---|---|
| Oct 30, 2019 | 3 hrs | 39,573 (100%) | Unnamed event |
| Oct 30, 2019 | 4 hrs | 39,573 (100%) | Unnamed event |
| Oct 30, 2019 | 1 hrs | 39,573 (100%) | Unnamed event |
| Oct 27, 2019 | 1 hrs | 39,556 (100%) | Unnamed event |
| Oct 27, 2019 | 5 hrs | 39,556 (100%) | Unnamed event |
Over the 8 years from 2018 to 2025, Lake County recorded 1,056 distinct power outage events, averaging 4.2 hours per event.
The single worst outage on record in Lake County started October 30, 2019, lasting 3 hours and leaving up to 39,573 customers without power (100% of the county) at its peak.
October has historically been the worst month for outages in Lake County, with 237 events recorded during that month across the dataset.
Based on this history, Lake County earns a Reliability Grade of F, placing it in the 2nd percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in California
Counties with the closest reliability grade and national percentile to Lake County.
| County | Grade | National percentile |
|---|---|---|
| El Dorado County | F | 2nd |
| Nevada County | F | 2nd |
| Alpine County | F | 2nd |
| Butte County | F | 1st |
| Tuolumne County | F | 1st |
FAQ
How often does power go out in Lake County?
Between 2018 and 2025, Lake County recorded 1,056 outage events, averaging 4.2 hours each.
What is Lake County's reliability grade?
Lake County has a Reliability Grade of F, in the 2nd national percentile.
What was the worst power outage in Lake County?
The worst outage on record started October 30, 2019, lasting 3 hours and affecting up to 39,573 customers.