Nez Perce County Power Outage History
2015–2025 · Idaho
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 |
|---|---|---|---|
| Apr 7, 2017 | 5 hrs | 9,627 (48%) | Thunderstorm Wind |
| Jul 9, 2023 | 4 hrs | 7,569 (38%) | Unnamed event |
| Mar 13, 2025 | 0 hrs | 7,496 (38%) | Unnamed event |
| Mar 10, 2021 | 2 hrs | 6,462 (32%) | Unnamed event |
| Sep 12, 2025 | 2 hrs | 6,178 (31%) | Unnamed event |
Over the 11 years from 2015 to 2025, Nez Perce County recorded 400 distinct power outage events, averaging 3.5 hours per event.
The single worst outage on record in Nez Perce County started April 7, 2017 (Thunderstorm Wind), lasting 5 hours and leaving up to 9,627 customers without power (48% of the county) at its peak.
August has historically been the worst month for outages in Nez Perce County, with 52 events recorded during that month across the dataset.
Based on this history, Nez Perce County earns a Reliability Grade of C, placing it in the 58th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Nez Perce County's outage profile
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Similar counties in Idaho
Counties with the closest reliability grade and national percentile to Nez Perce County.
| County | Grade | National percentile |
|---|---|---|
| Owyhee County | C | 57th |
| Jerome County | C | 59th |
| Elmore County | C | 59th |
| Fremont County | C | 57th |
| Bingham County | C | 56th |
FAQ
How often does power go out in Nez Perce County?
Between 2015 and 2025, Nez Perce County recorded 400 outage events, averaging 3.5 hours each.
What is Nez Perce County's reliability grade?
Nez Perce County has a Reliability Grade of C, in the 58th national percentile.
What was the worst power outage in Nez Perce County?
The worst outage on record started April 7, 2017 (Thunderstorm Wind), lasting 5 hours and affecting up to 9,627 customers.