County annual report · FIPS 04019
2015 Pima County, AZ Power Outage Report
In 2015, customers in Pima County, AZ went without power for an average of 0.3 hours, a total of 135K customer-hours (Arizona average 0.4 hours). That ranks 5th worst of 6 Arizona counties and 2200th of 2,484 nationally.
Compared with AZ, the US
Coverage line is EAGLE-I's share of Arizona customers tracked each year.
Biggest outages in Pima County, 2015
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 18, 2015 02:15 | October 18, 2015 06:15 | 4h | 9,171 | 12K |
| 2 | August 22, 2015 23:15 | August 24, 2015 00:00 | 1d | 6,888 | 16K |
| 3 | December 2, 2015 14:30 | December 2, 2015 15:45 | 1h 15m | 6,763 | 8,141 |
| 4 | October 8, 2015 18:00 | October 8, 2015 19:00 | 1h | 5,330 | 4,239 |
| 5 | December 29, 2015 14:15 | December 29, 2015 14:30 | 15m | 4,872 | 1,218 |
| 6 | October 6, 2015 20:00 | October 7, 2015 07:15 | 11h 15m | 4,449 | 4,215 |
| 7 | October 5, 2015 18:30 | October 5, 2015 20:00 | 1h 30m | 4,248 | 3,832 |
| 8 | August 25, 2015 14:30 | August 25, 2015 15:15 | 45m | 4,178 | 2,257 |
| 9 | September 28, 2015 17:15 | September 29, 2015 12:45 | 19h 30m | 3,705 | 3,471 |
| 10 | August 27, 2015 20:15 | August 30, 2015 03:45 | 2d 7h | 3,472 | 11K |
Outage episodes by size in 2015: 65 reached 100+ customers, 30 reached 1,000+ customers, 0 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 2015, 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 | 2015 | 2.0 hrs | 0.91 | 87 min | 0.87 |
| Sulphur Springs Valley E C Inc | 2015 | 86 min | - | 86 min | - |
| Trico Electric Cooperative Inc | 2015 | 1.8 hrs | 1.02 | 63 min | 0.69 |
| Tucson Electric Power Co | 2015 | 59 min | 0.74 | 59 min | 0.74 |
| 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 2015; 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, 2015, 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/2015/arizona/pima-county