Power outage history
Nez Perce County Idaho
4.5hours
without power for the average customer in a typical year, 2018–2025
20th most of 35 in Idaho 32% below the national median
Every day since 2015
Eleven years, one night at a time
Each cell is a day. The brighter it is, the larger the share of Nez Perce's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2025 was the worst well-recorded year, at 11 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Nez Perce, hours without power per customer
The record
The biggest outages since 2015
Ranked by customer-hours lost: customers out multiplied by how long they stayed out. Times are local.
| Began | Storm | Peak out | Share | Lasted | 90% restored | Customer-hours |
|---|---|---|---|---|---|---|
| Dec 17, 2025 | Windstorm | 3,929 | 20% | 5.2 d | 4.0 d | 147k |
| Jul 8, 2023 | No storm report | 7,569 | 38% | 4.0 h | 6.8 h | 29k |
| Sep 7, 2020 | No storm report | 784 | 4% | 46 h | – | 19k |
| May 1, 2022 | No storm report | 4,294 | 22% | 5.5 h | 4.5 h | 16k |
| Jul 25, 2024 | Wildfire | 285 | 1% | 2.1 d | – | 12k |
| Sep 9, 2025 | No storm report | 1,537 | 8% | 8.0 h | 11 h | 12k |
| Apr 7, 2017 | Thunderstorms | 9,627 | 48% | 4.2 h | 1.0 h | 11k |
| Sep 12, 2024 | No storm report | 4,772 | 24% | 3.2 h | 2.5 h | 10k |
| Sep 11, 2021 | No storm report | 2,165 | 11% | 5.2 h | 5.0 h | 9.7k |
| Sep 11, 2024 | No storm report | 4,303 | 22% | 2.5 h | 2.2 h | 9.3k |
| Jan 20, 2020 | No storm report | 1,205 | 6% | 8.0 h | 3.2 h | 8.8k |
| Sep 11, 2025 | No storm report | 6,178 | 31% | 3.0 h | 1.2 h | 8.6k |
| Dec 20, 2024 | No storm report | 1,645 | 8% | 7.2 h | 6.5 h | 7.7k |
| Apr 3, 2024 | No storm report | 471 | 2% | 16 h | – | 6.9k |
| Jul 9, 2024 | Wildfire | 1,198 | 6% | 13 h | 12 h | 6.3k |
| Apr 26, 2017 | No storm report | 1,334 | 7% | 8.2 h | 10 h | 6.2k |
| Aug 7, 2023 | No storm report | 1,796 | 9% | 4.8 h | 4.5 h | 6.1k |
| Oct 5, 2015 | No storm report | 583 | 3% | 10 h | – | 5.8k |
| Jul 15, 2025 | No storm report | 489 | 2% | 12 h | – | 5.4k |
| Oct 12, 2015 | No storm report | 389 | 2% | 14 h | – | 5.3k |
| Apr 29, 2018 | No storm report | 1,974 | 10% | 4.2 h | 4.2 h | 5.3k |
| Aug 29, 2023 | No storm report | 452 | 2% | 11 h | – | 5.0k |
| Feb 23, 2025 | No storm report | 460 | 2% | 15 h | – | 4.5k |
| Mar 9, 2021 | No storm report | 6,462 | 32% | 1.5 h | 48 min | 4.3k |
| Sep 13, 2018 | No storm report | 486 | 2% | 12 h | – | 3.9k |
| Jan 6, 2022 | No storm report | 450 | 2% | 8.8 h | – | 3.6k |
| Jan 7, 2024 | No storm report | 459 | 2% | 7.8 h | – | 3.5k |
| Feb 5, 2025 | Winter storm | 661 | 3% | 6.5 h | – | 3.5k |
| Sep 16, 2023 | No storm report | 2,546 | 13% | 1.8 h | 1.0 h | 3.5k |
| Apr 14, 2017 | No storm report | 1,962 | 10% | 2.0 h | 2.0 h | 3.4k |
After the peak
How fast the lights come back
Each line is one major outage, from its peak. The amber line is the typical path.
When it happens
The outage clock
Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.
What was happening
Weather behind the outages
Each outage is matched to NOAA storm reports for Nez Perce from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 60%
- Windstorm 31%
- Wildfire 4.8%
- Winter storm 1.6%
- Thunderstorms 1.2%
- Heat 0.9%
- Flooding 0.7%
Who keeps the lights on
Utilities serving Nez Perce
As each utility reports to the Energy Information Administration for its whole Idaho territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Avista Corp | Investor Owned | 973 | 208 | 1.89 | 11.8 | 129k |
| Clearwater Power Company | ID | 677 | 677 | 2.74 | 11.7 | 123k |
| Bonneville Power Administration | Federal | – | – | – | – | – |
EIA Form 861, latest year each utility reported. Outage minutes are SAIDI, the yearly minutes the average customer goes without power; outages a year are SAIFI.
Next door
Neighbouring counties
- Clearwater 34 h
- Wallowa, OR 13 h
- Idaho 11 h
- Latah 7.1 h
- Lewis 6.8 h
- Nez Perce (this county) 4.5 h
- Asotin, WA 2.1 h
- Whitman, WA 2.0 h
About these numbers
Notes
Outages come from the EAGLE-I record of utility outage maps collected every 15 minutes by Oak Ridge National Laboratory. Hours without power are customer-hours divided by the county's 19,938 electricity customers. Averages use well-covered years from 2018. Outages shorter than 15 minutes, and utilities that publish no outage map, are not in the record, so these figures understate the total. How every number is made →