Napa 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 10, 2019 | 1 hrs | 46,279 (73%) | Wildfire |
| Oct 10, 2019 | 12 hrs | 46,278 (73%) | Wildfire |
| Oct 10, 2019 | 0 hrs | 46,266 (72%) | Wildfire |
| Oct 10, 2019 | 6 hrs | 45,759 (72%) | Wildfire |
| Oct 10, 2019 | 4 hrs | 45,484 (71%) | Wildfire |
Over the 8 years from 2018 to 2025, Napa County recorded 1,308 distinct power outage events, averaging 4.5 hours per event.
The single worst outage on record in Napa County started October 10, 2019 (Wildfire), lasting 1 hours and leaving up to 46,279 customers without power (73% of the county) at its peak.
October has historically been the worst month for outages in Napa County, with 226 events recorded during that month across the dataset.
Based on this history, Napa County earns a Reliability Grade of F, placing it in the 7th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Napa County's outage profile
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Similar counties in California
Counties with the closest reliability grade and national percentile to Napa County.
| County | Grade | National percentile |
|---|---|---|
| Tehama County | F | 7th |
| Shasta County | F | 9th |
| Santa Cruz County | F | 6th |
| Del Norte County | F | 6th |
| Humboldt County | F | 5th |
FAQ
How often does power go out in Napa County?
Between 2018 and 2025, Napa County recorded 1,308 outage events, averaging 4.5 hours each.
What is Napa County's reliability grade?
Napa County has a Reliability Grade of F, in the 7th national percentile.
What was the worst power outage in Napa County?
The worst outage on record started October 10, 2019 (Wildfire), lasting 1 hours and affecting up to 46,279 customers.