Inyo CountyPower Outage History
What this grade means
Bottom 20% least reliable nationally — frequent and/or long outages. This county ranks in the least reliable fifth of all US counties in our dataset: some combination of frequent outages, long restoration times, or customers affected puts it near the bottom nationally. Backup power is worth prioritizing here rather than treating it as optional.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Sep 16, 2019 | <1 hr | 4,740 (60%) | Wildfire |
| Jul 7, 2017 | <1 hr | 4,645 (59%) | Flood |
| 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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Inyo County, California that day.
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 less than 1 hour 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).
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 |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
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 less than 1 hour and affecting up to 4,740 customers.