County annual report · FIPS 04017
2018 Navajo County, AZ Power Outage Report
In 2018, customers in Navajo County, AZ went without power for an average of 4.5 hours, a total of 382K customer-hours (Arizona average 1.9 hours). That ranks 4th worst of 13 Arizona counties and 1135th of 2,798 nationally.
Compared with AZ, the US and 2017
Coverage line is EAGLE-I's share of Arizona customers tracked each year.
Biggest outages in Navajo County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 9, 2018 02:00 | August 10, 2018 18:30 | 1d 16h | 12,657 | 42K |
| 2 | October 16, 2018 10:00 | October 16, 2018 18:15 | 8h 15m | 8,426 | 30K |
| 3 | October 16, 2018 20:45 | October 16, 2018 21:00 | 15m | 8,326 | 2,082 |
| 4 | October 16, 2018 19:15 | October 16, 2018 19:30 | 15m | 8,130 | 2,033 |
| 5 | July 17, 2018 00:00 | July 17, 2018 05:15 | 5h 15m | 5,836 | 15K |
| 6 | June 4, 2018 22:15 | June 5, 2018 21:30 | 23h 15m | 5,806 | 135K |
| 7 | August 19, 2018 03:15 | August 19, 2018 04:15 | 1h | 5,240 | 5,239 |
| 8 | October 7, 2018 14:00 | October 8, 2018 02:15 | 12h 15m | 5,187 | 18K |
| 9 | August 15, 2018 07:45 | August 15, 2018 23:45 | 16h | 3,757 | 10K |
| 10 | September 27, 2018 18:45 | September 28, 2018 01:45 | 7h | 3,703 | 4,705 |
Outage episodes by size in 2018: 92 reached 100+ customers, 28 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 2018, 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 | 2018 | 2.6 hrs | 1.08 | 86 min | 0.84 |
| 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 87% of Arizona's customers in 2018; 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, 2018, 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/2018/arizona/navajo-county