Power outage history
Navajo County Arizona
3.2hours
without power for the average customer in a typical year, 2018–2025
2nd most of 11 in Arizona 52% 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 Navajo's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2019 was the worst well-recorded year, at 5.3 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Navajo, 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 |
|---|---|---|---|---|---|---|
| Nov 20, 2019 | Winter storm | 9,160 | 11% | 2.0 d | 34 h | 158k |
| Jun 4, 2018 | No storm report | 5,806 | 7% | 23 h | 11 h | 135k |
| Jan 1, 2023 | Winter storm | 5,677 | 7% | 23 h | 17 h | 67k |
| Sep 29, 2020 | No storm report | 13,126 | 16% | 5.8 h | 12 min | 66k |
| Jan 1, 2019 | Winter storm | 15,960 | 19% | 4.0 h | 3.5 h | 57k |
| Apr 18, 2025 | Winter storm | 13,067 | 15% | 7.5 h | 1.2 h | 51k |
| Feb 22, 2023 | Windstorm | 9,877 | 12% | 12 h | 5.0 h | 50k |
| Oct 12, 2019 | No storm report | 19,233 | 23% | 3.2 h | 1.5 h | 47k |
| Aug 9, 2018 | Thunderstorms | 12,657 | 15% | 5.2 h | 4.0 h | 40k |
| Jun 19, 2022 | No storm report | 4,756 | 6% | 18 h | 13 h | 35k |
| Dec 15, 2021 | Windstorm | 8,423 | 10% | 11 h | 4.2 h | 35k |
| Jul 16, 2021 | No storm report | 5,529 | 7% | 6.2 h | 5.2 h | 30k |
| Oct 16, 2018 | No storm report | 8,426 | 10% | 4.2 h | 1.8 h | 30k |
| Dec 31, 2021 | Winter storm | 3,262 | 4% | 18 h | – | 27k |
| Nov 29, 2019 | Winter storm | 3,596 | 4% | 13 h | – | 25k |
| Dec 31, 2018 | Winter storm | 15,613 | 19% | 3.2 h | 1.2 h | 23k |
| Apr 5, 2024 | Windstorm | 7,858 | 9% | 5.8 h | 4.8 h | 23k |
| Jul 5, 2025 | No storm report | 9,232 | 11% | 2.5 h | 1.0 h | 20k |
| May 3, 2025 | No storm report | 11,630 | 14% | 1.8 h | 1.8 h | 20k |
| Nov 4, 2024 | No storm report | 2,643 | 3% | 12 h | – | 20k |
| Jul 24, 2022 | Flooding | 2,286 | 3% | 8.5 h | – | 17k |
| Oct 7, 2018 | No storm report | 5,187 | 6% | 6.2 h | 5.5 h | 17k |
| Jan 27, 2021 | No storm report | 5,236 | 6% | 4.5 h | 12 h | 16k |
| Jan 1, 2022 | Winter storm | 4,841 | 6% | 4.0 h | 48 min | 16k |
| Apr 25, 2024 | No storm report | 5,826 | 7% | 2.8 h | 9.2 h | 16k |
| Nov 11, 2019 | No storm report | 1,198 | 1% | 15 h | – | 16k |
| Aug 9, 2023 | Flooding | 6,390 | 8% | 2.8 h | 2.8 h | 15k |
| Jul 16, 2018 | Flooding | 5,836 | 7% | 2.5 h | 1.8 h | 15k |
| Jan 13, 2019 | Winter storm | 15,978 | 19% | 2.0 h | 12 min | 14k |
| Sep 13, 2023 | No storm report | 2,131 | 3% | 6.5 h | – | 13k |
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 Navajo from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 53%
- Winter storm 30%
- Windstorm 8.4%
- Flooding 4.6%
- Thunderstorms 3.0%
- Tornadoes 0.7%
Who keeps the lights on
Utilities serving Navajo
As each utility reports to the Energy Information Administration for its whole Arizona territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Arizona Public Service Co | Investor Owned | 73 | 73 | 0.84 | 17.0 | 1.3M |
| Navopache Electric Coop, Inc | Cooperative | – | – | – | 13.5 | 41k |
| Navajo Tribal Utility Authority | State | 216 | 216 | 2.32 | 16.5 | 27k |
| WAPA-- Western Area 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
- Gila 5.3 h
- Navajo (this county) 3.2 h
- San Juan, UT 1.9 h
- Apache 1.8 h
- Coconino 1.8 h
- Graham 0.1 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 84,388 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 →