County annual report · FIPS 04019
2016 Pima County, AZ Power Outage Report
In 2016, customers in Pima County, AZ went without power for an average of 1.4 hours, a total of 675K customer-hours (Arizona average 0.7 hours). That ranks 2nd worst of 9 Arizona counties and 1600th of 2,391 nationally.
Compared with AZ, the US and 2015
Coverage line is EAGLE-I's share of Arizona customers tracked each year.
Biggest outages in Pima County, 2016
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | February 1, 2016 00:15 | February 1, 2016 11:30 | 11h 15m | 55,764 | 186K |
| 2 | February 17, 2016 18:30 | February 17, 2016 19:30 | 1h | 32,778 | 23K |
| 3 | June 27, 2016 02:30 | June 28, 2016 08:45 | 1d 6h | 24,164 | 71K |
| 4 | July 27, 2016 23:15 | July 29, 2016 04:15 | 1d 5h | 19,456 | 63K |
| 5 | April 28, 2016 21:45 | April 28, 2016 22:45 | 1h | 16,969 | 4,271 |
| 6 | November 9, 2016 10:45 | November 9, 2016 13:30 | 2h 45m | 13,281 | 20K |
| 7 | June 23, 2016 06:45 | June 23, 2016 08:00 | 1h 15m | 11,250 | 13K |
| 8 | January 26, 2016 21:00 | January 26, 2016 21:45 | 45m | 9,734 | 5,405 |
| 9 | January 15, 2016 23:45 | January 16, 2016 01:15 | 1h 30m | 8,975 | 9,699 |
| 10 | June 23, 2016 19:45 | June 23, 2016 20:15 | 30m | 6,841 | 3,421 |
Outage episodes by size in 2016: 168 reached 100+ customers, 73 reached 1,000+ customers, 7 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 2016, 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 | 2016 | 2.0 hrs | 0.91 | 87 min | 0.82 |
| Sulphur Springs Valley E C Inc | 2016 | 1.8 hrs | 0.55 | 1.8 hrs | 0.55 |
| Trico Electric Cooperative Inc | 2016 | 41 min | 0.49 | 41 min | 0.49 |
| Tucson Electric Power Co | 2016 | 89 min | 1.13 | 65 min | 0.91 |
| 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 2016; 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, 2016, 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/2016/arizona/pima-county