County annual report · FIPS 04019
2019 Pima County, AZ Power Outage Report
In 2019, customers in Pima County, AZ went without power for an average of 0.5 hours, a total of 269K customer-hours (Arizona average 1.3 hours). That ranks 11th worst of 13 Arizona counties and 2661st of 2,945 nationally.
Compared with AZ, the US and 2018
Coverage line is EAGLE-I's share of Arizona customers tracked each year.
Biggest outages in Pima County, 2019
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | April 13, 2019 10:00 | April 13, 2019 22:45 | 12h 45m | 13,662 | 34K |
| 2 | January 16, 2019 16:45 | January 16, 2019 18:15 | 1h 30m | 10,215 | 10K |
| 3 | July 13, 2019 23:45 | July 14, 2019 12:15 | 12h 30m | 9,481 | 18K |
| 4 | July 25, 2019 01:15 | July 26, 2019 20:00 | 1d 18h | 8,676 | 14K |
| 5 | March 12, 2019 20:45 | March 12, 2019 21:15 | 30m | 8,170 | 3,401 |
| 6 | March 13, 2019 01:45 | March 13, 2019 11:45 | 10h | 7,725 | 16K |
| 7 | July 22, 2019 15:45 | July 24, 2019 08:30 | 1d 16h | 4,480 | 18K |
| 8 | May 30, 2019 18:45 | May 30, 2019 19:30 | 45m | 3,991 | 1,233 |
| 9 | June 23, 2019 18:00 | June 24, 2019 01:15 | 7h 15m | 3,805 | 3,397 |
| 10 | June 24, 2019 20:30 | June 24, 2019 21:00 | 30m | 3,375 | 1,688 |
Outage episodes by size in 2019: 122 reached 100+ customers, 58 reached 1,000+ customers, 2 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 2019, 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 |
| Sulphur Springs Valley E C Inc | 2018 | 73 min | 0.93 | 73 min | 0.93 |
| Trico Electric Cooperative Inc | 2018 | 1.5 hrs | 0.66 | 28 min | 0.25 |
| Tucson Electric Power Co | 2018 | 51 min | 0.78 | 0 min | 0.00 |
| 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 86% of Arizona's customers in 2019; 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, 2019, 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/2019/arizona/pima-county