San Bernardino County Power Outage History
2014–2025 · California
Average — typical outage frequency and duration nationally. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Oct 20, 2020 | 186 hrs | 62,238 (7%) | Excessive Heat |
| Jul 13, 2018 | 7 hrs | 57,794 (7%) | Excessive Heat |
| Jul 13, 2018 | 1 hrs | 57,162 (7%) | Excessive Heat |
| Sep 9, 2022 | 35 hrs | 53,475 (6%) | Excessive Heat |
| May 25, 2021 | 11 hrs | 49,071 (6%) | High Wind |
Over the 12 years from 2014 to 2025, San Bernardino County recorded 8,314 distinct power outage events, averaging 5.2 hours per event.
The single worst outage on record in San Bernardino County started October 20, 2020 (Excessive Heat), lasting 186 hours and leaving up to 62,238 customers without power (7% of the county) at its peak.
June has historically been the worst month for outages in San Bernardino County, with 837 events recorded during that month across the dataset.
Based on this history, San Bernardino County earns a Reliability Grade of C, placing it in the 41st percentile nationally for grid reliability (higher percentile = more reliable).
Sized for San Bernardino County's outage profile
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Similar counties in California
Counties with the closest reliability grade and national percentile to San Bernardino County.
| County | Grade | National percentile |
|---|---|---|
| Yolo County | D | 40th |
| Los Angeles County | C | 42nd |
| Solano County | C | 44th |
| Riverside County | C | 45th |
| Ventura County | D | 35th |
FAQ
How often does power go out in San Bernardino County?
Between 2014 and 2025, San Bernardino County recorded 8,314 outage events, averaging 5.2 hours each.
What is San Bernardino County's reliability grade?
San Bernardino County has a Reliability Grade of C, in the 41st national percentile.
What was the worst power outage in San Bernardino County?
The worst outage on record started October 20, 2020 (Excessive Heat), lasting 186 hours and affecting up to 62,238 customers.