Inyo County Power Outage History
2014–2025 · 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 |
|---|---|---|---|
| Sep 16, 2019 | 1 hrs | 4,740 (60%) | Wildfire |
| Jul 7, 2017 | 0 hrs | 4,645 (59%) | Excessive Heat |
| Oct 3, 2021 | 1 hrs | 4,614 (59%) | Unnamed event |
| Oct 3, 2021 | 2 hrs | 4,614 (59%) | Unnamed event |
| Oct 10, 2017 | 4 hrs | 4,415 (56%) | High Wind |
Over the 12 years from 2014 to 2025, Inyo County recorded 739 distinct power outage events, averaging 5.0 hours per event.
The single worst outage on record in Inyo County started September 16, 2019 (Wildfire), lasting 1 hours and leaving up to 4,740 customers without power (60% of the county) at its peak.
October has historically been the worst month for outages in Inyo County, with 88 events recorded during that month across the dataset.
Based on this history, Inyo County earns a Reliability Grade of F, placing it in the 16th 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 Inyo County.
| County | Grade | National percentile |
|---|---|---|
| Marin County | F | 16th |
| Yuba County | F | 15th |
| Mono County | F | 19th |
| Sonoma County | F | 13th |
| Siskiyou County | F | 20th |
FAQ
How often does power go out in Inyo County?
Between 2014 and 2025, Inyo County recorded 739 outage events, averaging 5.0 hours each.
What is Inyo County's reliability grade?
Inyo County has a Reliability Grade of F, in the 16th national percentile.
What was the worst power outage in Inyo County?
The worst outage on record started September 16, 2019 (Wildfire), lasting 1 hours and affecting up to 4,740 customers.