Power outages in Arizona
In 2025, Arizona customers experienced an average of 74.2 minutes (1.2 hours) of total outage time. This is well below the US median of 258.7 minutes (4.3 hours).
Trend
Arizona's total outage duration peaked in 2022 at 139.7 minutes (2.3 hours) but has since improved, returning to 2020 levels by 2025.
Utilities in 2025
Electrical Dist No3 Pinal County had the lowest outage time in 2025 at 30.41 minutes (0.5 hours), while Navajo Tribal Utility Authority had the highest at 215.915 minutes (3.6 hours).
| Utility | Customers | Hours / yr | Interruptions |
|---|---|---|---|
| Navajo Tribal Utility Authority | 30,319 | 3.6 | 2.3 |
| Mohave Electric Cooperative, Inc. | 45,941 | 3.3 | — |
| Sulphur Springs Valley E C Inc | 54,786 | 1.5 | 0.8 |
| Trico Electric Cooperative Inc | 56,123 | 1.5 | 0.7 |
| UNS Electric, Inc | 108,034 | 1.4 | 0.9 |
| Arizona Public Service Co | 1,426,947 | 1.2 | 0.8 |
| Salt River Project | 1,182,229 | 1.1 | 1.0 |
| City of Mesa - (AZ) | 18,192 | 0.9 | 0.5 |
| Tucson Electric Power Co | 460,504 | 0.7 | 0.6 |
| Electrical Dist No3 Pinal County | 36,300 | 0.5 | 0.4 |
What this means for backup power
For everyday outages, plan for 1.3 hours (the average length of one interruption). To ride out a year like 2022, size for 2.3 hours (all of that year's outage hours).
FAQ
What does the 74.2 minutes of outages mean for my home?
This is the total outage time across the year, not one event. The average outage lasts 1.3 hours, and you'll experience about 0.9 interruptions per year.
How much backup power capacity should I plan for?
For typical outages, size for 1.3 hours. To handle a worst-case year like 2022, plan for 2.3 hours total.
What if my utility has more outages than average?
If you're served by a utility with higher outage times, like Navajo Tribal Utility Authority (3.6 hours in 2025), consider sizing for that instead of the state average.
Utility pages
Source: U.S. EIA Form 861 Reliability file. Data snapshot 2026-11-05.