County annual report · FIPS 04019
2020 Pima County, AZ Power Outage Report
In 2020, customers in Pima County, AZ went without power for an average of 0.8 hours, a total of 395K customer-hours (Arizona average 1.3 hours). That ranks 10th worst of 14 Arizona counties and 2735th of 3,019 nationally.
Compared with AZ, the US and 2019
Coverage line is EAGLE-I's share of Arizona customers tracked each year.
Biggest outages in Pima County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 18, 2020 01:00 | August 13, 2020 20:45 | 56d 19h | 21,950 | 203K |
| 2 | August 21, 2020 02:00 | August 21, 2020 20:00 | 18h | 18,677 | 32K |
| 3 | August 18, 2020 18:15 | August 18, 2020 19:45 | 1h 30m | 10,527 | 3,150 |
| 4 | August 27, 2020 04:45 | August 27, 2020 23:00 | 18h 15m | 9,054 | 17K |
| 5 | August 13, 2020 22:00 | August 14, 2020 19:00 | 21h | 7,257 | 11K |
| 6 | December 2, 2020 21:15 | December 2, 2020 22:00 | 45m | 5,648 | 4,236 |
| 7 | October 6, 2020 15:15 | October 6, 2020 18:30 | 3h 15m | 4,200 | 4,223 |
| 8 | August 16, 2020 22:45 | August 17, 2020 08:00 | 9h 15m | 4,055 | 14K |
| 9 | February 16, 2020 14:15 | February 16, 2020 23:45 | 9h 30m | 3,548 | 2,692 |
| 10 | October 8, 2020 01:30 | October 9, 2020 13:15 | 1d 11h | 3,548 | 2,614 |
Outage episodes by size in 2020: 65 reached 100+ customers, 30 reached 1,000+ customers, 3 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 2020, 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 | 2020 | 84 min | 0.86 | 79 min | 0.85 |
| Sulphur Springs Valley E C Inc | 2020 | 2.6 hrs | 1.21 | 2.3 hrs | 1.07 |
| Trico Electric Cooperative Inc | 2020 | 2.1 hrs | 0.65 | 49 min | 0.48 |
| Tucson Electric Power Co | 2020 | 60 min | 0.71 | - | - |
| 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 90% of Arizona's customers in 2020; 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, 2020, 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/2020/arizona/pima-county