Tehama 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 9, 2019 | 4 hrs | 22,542 (80%) | Strong Wind |
| Oct 9, 2019 | 1 hrs | 22,522 (80%) | Strong Wind |
| Oct 10, 2019 | 0 hrs | 22,507 (80%) | Strong Wind |
| Oct 9, 2019 | 1 hrs | 22,507 (80%) | Strong Wind |
| Oct 10, 2019 | 4 hrs | 22,507 (80%) | Strong Wind |
Over the 8 years from 2018 to 2025, Tehama County recorded 831 distinct power outage events, averaging 4.7 hours per event.
The single worst outage on record in Tehama County started October 9, 2019 (Strong Wind), lasting 4 hours and leaving up to 22,542 customers without power (80% of the county) at its peak.
October has historically been the worst month for outages in Tehama County, with 139 events recorded during that month across the dataset.
Based on this history, Tehama County earns a Reliability Grade of F, placing it in the 7th 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 Tehama County.
| County | Grade | National percentile |
|---|---|---|
| Napa County | F | 7th |
| Santa Cruz County | F | 6th |
| Del Norte County | F | 6th |
| Shasta County | F | 9th |
| Humboldt County | F | 5th |
FAQ
How often does power go out in Tehama County?
Between 2018 and 2025, Tehama County recorded 831 outage events, averaging 4.7 hours each.
What is Tehama County's reliability grade?
Tehama County has a Reliability Grade of F, in the 7th national percentile.
What was the worst power outage in Tehama County?
The worst outage on record started October 9, 2019 (Strong Wind), lasting 4 hours and affecting up to 22,542 customers.