San Joaquin County Power Outage History
2018–2025 · California
Better than average — fewer or shorter 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 |
|---|---|---|---|
| Aug 16, 2020 | 4 hrs | 67,403 (20%) | Wildfire |
| Jun 19, 2025 | 53 hrs | 61,218 (19%) | Unnamed event |
| Jan 27, 2021 | 38 hrs | 56,870 (17%) | High Wind |
| Feb 4, 2024 | 61 hrs | 46,271 (14%) | High Wind |
| Jan 1, 2023 | 66 hrs | 43,541 (13%) | Drought |
Over the 8 years from 2018 to 2025, San Joaquin County recorded 2,345 distinct power outage events, averaging 2.3 hours per event.
The single worst outage on record in San Joaquin County started August 16, 2020 (Wildfire), lasting 4 hours and leaving up to 67,403 customers without power (20% of the county) at its peak.
June has historically been the worst month for outages in San Joaquin County, with 248 events recorded during that month across the dataset.
Based on this history, San Joaquin County earns a Reliability Grade of B, placing it in the 65th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for San Joaquin County's outage profile
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Similar counties in California
Counties with the closest reliability grade and national percentile to San Joaquin County.
| County | Grade | National percentile |
|---|---|---|
| Orange County | B | 65th |
| Sutter County | B | 64th |
| Alameda County | B | 68th |
| San Diego County | B | 61st |
| Merced County | B | 70th |
FAQ
How often does power go out in San Joaquin County?
Between 2018 and 2025, San Joaquin County recorded 2,345 outage events, averaging 2.3 hours each.
What is San Joaquin County's reliability grade?
San Joaquin County has a Reliability Grade of B, in the 65th national percentile.
What was the worst power outage in San Joaquin County?
The worst outage on record started August 16, 2020 (Wildfire), lasting 4 hours and affecting up to 67,403 customers.