Alpine CountyPower Outage History
2017–2025 · California
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 |
|---|---|---|---|
| Aug 22, 2024 | 6 hrs | 684 (77%) | Wildfire |
| Oct 29, 2019 | <1 hr | 654 (74%) | Wildfire |
| Sep 28, 2020 | 2 hrs | 654 (74%) | Unnamed event |
| Oct 29, 2019 | <1 hr | 654 (74%) | Wildfire |
| Oct 28, 2019 | 3 hrs | 654 (74%) | Wildfire |
Over the 9 years from 2017 to 2025, Alpine County recorded 374 distinct power outage events, averaging 8.2 hours per event.
The single worst outage on record in Alpine County started August 22, 2024 (Wildfire), lasting 6 hours and leaving up to 684 customers without power (77% of the county) at its peak.
October has historically been the worst month for outages in Alpine County, with 92 events recorded during that month across the dataset.
Based on this history, Alpine County earns a Reliability Grade of F, placing it in the 2nd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Alpine County's outage profile
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Read our mission →Similar counties in California
Counties with the closest reliability grade and national percentile to Alpine County.
| County | Grade | National percentile |
|---|---|---|
| Nevada County | F | 2nd |
| Lake County | F | 2nd |
| El Dorado County | F | 2nd |
| Butte County | F | 1st |
| Tuolumne County | F | 1st |
Most reliable counties in California
The top 3 counties in California by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Stanislaus County | A | 97th |
| Lassen County | A | 96th |
| San Benito County | B | 80th |
Least reliable counties in California
The bottom 3 counties in California by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Sierra County | F | 0th |
| Plumas County | F | 1st |
| Mariposa County | F | 1st |
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 Alpine County?
Between 2017 and 2025, Alpine County recorded 374 outage events, averaging 8.2 hours each.
What is Alpine County's reliability grade?
Alpine County has a Reliability Grade of F, in the 2nd national percentile.
What was the worst power outage in Alpine County?
The worst outage on record started August 22, 2024 (Wildfire), lasting 6 hours and affecting up to 684 customers.