Ventura County Power Outage History
2014–2025 · California
Worse than average — more frequent or longer outages than most counties. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Dec 5, 2017 | 10 hrs | 106,947 (33%) | Unnamed event |
| Dec 10, 2020 | 7 hrs | 84,083 (26%) | Unnamed event |
| Jan 19, 2021 | 60 hrs | 76,167 (24%) | Unnamed event |
| Oct 5, 2021 | 11 hrs | 74,381 (23%) | Unnamed event |
| Oct 28, 2017 | 4 hrs | 33,018 (10%) | Unnamed event |
Over the 12 years from 2014 to 2025, Ventura County recorded 6,494 distinct power outage events, averaging 3.7 hours per event.
The single worst outage on record in Ventura County started December 5, 2017, lasting 10 hours and leaving up to 106,947 customers without power (33% of the county) at its peak.
June has historically been the worst month for outages in Ventura County, with 655 events recorded during that month across the dataset.
Based on this history, Ventura County earns a Reliability Grade of D, placing it in the 35th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Ventura County's outage profile
See more picks in our Best Dual-Fuel Portable Generators for Power Outages roundup.
Champion Power Equipment 4375-Watt Dual Fuel RV Ready Portable Generator with Free 3-Year Warranty
Outage-prep kit
See our outage-prep guides.
Similar counties in California
Counties with the closest reliability grade and national percentile to Ventura County.
| County | Grade | National percentile |
|---|---|---|
| San Mateo County | D | 32nd |
| Glenn County | D | 32nd |
| Yolo County | D | 40th |
| Placer County | D | 29th |
| San Bernardino County | C | 41st |
FAQ
How often does power go out in Ventura County?
Between 2014 and 2025, Ventura County recorded 6,494 outage events, averaging 3.7 hours each.
What is Ventura County's reliability grade?
Ventura County has a Reliability Grade of D, in the 35th national percentile.
What was the worst power outage in Ventura County?
The worst outage on record started December 5, 2017, lasting 10 hours and affecting up to 106,947 customers.