County annual report · FIPS 04017
2021 Navajo County, AZ Power Outage Report
In 2021, customers in Navajo County, AZ went without power for an average of 2.9 hours, a total of 241K customer-hours (Arizona average 1.9 hours). That ranks 5th worst of 13 Arizona counties and 1905th of 2,974 nationally.
Compared with AZ, the US and 2020
Coverage line is EAGLE-I's share of Arizona customers tracked each year.
Biggest outages in Navajo County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | September 30, 2021 07:00 | September 30, 2021 18:00 | 11h | 12,340 | 5,072 |
| 2 | December 15, 2021 08:15 | December 21, 2021 02:00 | 5d 17h | 8,423 | 38K |
| 3 | August 27, 2021 22:15 | August 28, 2021 05:45 | 7h 30m | 6,947 | 4,932 |
| 4 | July 17, 2021 02:45 | July 17, 2021 16:45 | 14h | 5,529 | 31K |
| 5 | May 5, 2021 16:30 | May 5, 2021 16:45 | 15m | 5,242 | 1,311 |
| 6 | January 27, 2021 16:30 | January 28, 2021 06:00 | 13h 30m | 5,236 | 16K |
| 7 | July 15, 2021 00:15 | July 15, 2021 04:00 | 3h 45m | 5,153 | 7,825 |
| 8 | July 23, 2021 03:45 | August 2, 2021 23:45 | 10d 20h | 4,252 | 19K |
| 9 | January 30, 2021 03:15 | January 30, 2021 05:00 | 1h 45m | 4,232 | 1,090 |
| 10 | September 6, 2021 21:45 | September 7, 2021 01:00 | 3h 15m | 3,865 | 5,799 |
Outage episodes by size in 2021: 81 reached 100+ customers, 27 reached 1,000+ customers, 1 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Navajo County reported on EIA Form 861 for 2021, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Arizona Public Service Co | 2021 | 1.8 hrs | 1.02 | 87 min | 0.89 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Navajo Tribal Utility Authority | - | - | - | - | - |
| Navopache Electric Coop, Inc | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 91% of Arizona's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 84,388 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Navajo County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Navajo County, AZ annual power outage report, 2021, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2021/arizona/navajo-county