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 |
|---|---|---|---|
| Oct 30, 2019 | 3 hrs | 39,573 (100%) | Unnamed event |
| Oct 30, 2019 | 4 hrs | 39,573 (100%) | Unnamed event |
| Oct 30, 2019 | <1 hr | 39,573 (100%) | Unnamed event |
| Oct 9, 2019 | 5 hrs | 39,556 (100%) | Unnamed event |
| Oct 9, 2019 | 4 hrs | 39,556 (100%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Lake County, California that day.
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).
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 |
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 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.