Mendocino 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 28, 2019 | 1 hrs | 41,599 (83%) | Unnamed event |
| Oct 28, 2019 | 4 hrs | 41,599 (83%) | Unnamed event |
| Oct 28, 2019 | 3 hrs | 41,599 (83%) | Unnamed event |
| Oct 28, 2019 | 2 hrs | 41,599 (83%) | Unnamed event |
| Oct 28, 2019 | 7 hrs | 41,599 (83%) | Unnamed event |
Over the 8 years from 2018 to 2025, Mendocino County recorded 1,025 distinct power outage events, averaging 4.4 hours per event.
The single worst outage on record in Mendocino County started October 28, 2019, lasting 1 hours and leaving up to 41,599 customers without power (83% of the county) at its peak.
October has historically been the worst month for outages in Mendocino County, with 160 events recorded during that month across the dataset.
Based on this history, Mendocino County earns a Reliability Grade of F, placing it in the 5th 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 Mendocino County.
| County | Grade | National percentile |
|---|---|---|
| Humboldt County | F | 5th |
| Del Norte County | F | 6th |
| Santa Cruz County | F | 6th |
| Tehama County | F | 7th |
| Alpine County | F | 2nd |
FAQ
How often does power go out in Mendocino County?
Between 2018 and 2025, Mendocino County recorded 1,025 outage events, averaging 4.4 hours each.
What is Mendocino County's reliability grade?
Mendocino County has a Reliability Grade of F, in the 5th national percentile.
What was the worst power outage in Mendocino County?
The worst outage on record started October 28, 2019, lasting 1 hours and affecting up to 41,599 customers.