County annual report · FIPS 04019
2017 Pima County, AZ Power Outage Report
In 2017, customers in Pima County, AZ went without power for an average of 0.5 hours, a total of 231K customer-hours (Arizona average 1.1 hours). That ranks 11th worst of 13 Arizona counties and 2309th of 2,786 nationally.
Compared with AZ, the US and 2016
Coverage line is EAGLE-I's share of Arizona customers tracked each year.
Biggest outages in Pima County, 2017
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 20, 2017 15:15 | December 20, 2017 18:00 | 2h 45m | 43,225 | 15K |
| 2 | December 3, 2017 02:15 | December 3, 2017 09:00 | 6h 45m | 13,725 | 22K |
| 3 | October 8, 2017 10:15 | October 8, 2017 20:00 | 9h 45m | 11,729 | 22K |
| 4 | August 10, 2017 23:30 | August 12, 2017 11:30 | 1d 12h | 11,297 | 56K |
| 5 | October 4, 2017 22:15 | October 4, 2017 22:30 | 15m | 7,574 | 1,894 |
| 6 | September 1, 2017 21:45 | September 2, 2017 02:15 | 4h 30m | 6,151 | 16K |
| 7 | December 26, 2017 17:00 | December 27, 2017 01:45 | 8h 45m | 6,063 | 16K |
| 8 | August 29, 2017 19:00 | August 29, 2017 19:15 | 15m | 5,583 | 1,396 |
| 9 | August 23, 2017 19:15 | August 24, 2017 13:00 | 17h 45m | 4,437 | 14K |
| 10 | December 3, 2017 15:30 | December 3, 2017 15:45 | 15m | 4,283 | 1,071 |
Outage episodes by size in 2017: 61 reached 100+ customers, 32 reached 1,000+ customers, 4 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 Pima County reported on EIA Form 861 for 2017, 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 | 2017 | 1.9 hrs | 0.91 | 75 min | 0.75 |
| Sulphur Springs Valley E C Inc | 2017 | 83 min | 1.19 | 69 min | 0.85 |
| Trico Electric Cooperative Inc | 2017 | 2.0 hrs | 0.76 | 47 min | 0.38 |
| Tucson Electric Power Co | 2017 | 72 min | 0.97 | 7 min | 0.05 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| USBIA-San Carlos Project | - | - | - | - | - |
| Tohono O'Odham Utility Authority | - | - | - | - | - |
| Ajo Improvement Co | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about n/a of Arizona's customers in 2017; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 492,744 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. Pima County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Pima County, AZ annual power outage report, 2017, 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/2017/arizona/pima-county