County annual report · FIPS 04019
2023 Pima County, AZ Power Outage Report
In 2023, customers in Pima County, AZ went without power for an average of 3.6 hours, a total of 1.8M customer-hours (Arizona average 2.1 hours). That ranks 3rd worst of 14 Arizona counties and 1757th of 2,977 nationally.
Compared with AZ, the US and 2022
Coverage line is EAGLE-I's share of Arizona customers tracked each year.
Biggest outages in Pima County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 24, 2023 02:15 | August 18, 2023 19:15 | 25d 17h | 54,076 | 861K |
| 2 | January 6, 2023 13:15 | January 23, 2023 09:30 | 16d 20h | 20,927 | 121K |
| 3 | July 17, 2023 17:15 | July 23, 2023 20:00 | 6d 2h | 20,224 | 197K |
| 4 | August 21, 2023 15:30 | September 15, 2023 18:45 | 25d 3h | 18,896 | 168K |
| 5 | July 11, 2023 05:45 | July 13, 2023 21:45 | 2d 16h | 9,997 | 37K |
| 6 | February 14, 2023 15:15 | February 18, 2023 00:15 | 3d 9h | 9,540 | 19K |
| 7 | December 11, 2023 15:15 | December 11, 2023 20:00 | 4h 45m | 8,510 | 11K |
| 8 | February 3, 2023 15:15 | February 9, 2023 02:15 | 5d 11h | 6,531 | 2,122 |
| 9 | January 28, 2023 05:30 | January 28, 2023 12:15 | 6h 45m | 6,183 | 9,684 |
| 10 | May 17, 2023 04:30 | May 18, 2023 22:30 | 1d 18h | 6,111 | 2,766 |
Outage episodes by size in 2023: 105 reached 100+ customers, 52 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 2023, 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 | 2023 | 1.6 hrs | 0.88 | 82 min | 0.81 |
| Sulphur Springs Valley E C Inc | 2023 | 2.3 hrs | 1.13 | 1.5 hrs | 0.81 |
| Trico Electric Cooperative Inc | 2023 | 4.0 hrs | 1.17 | 82 min | 0.65 |
| Tucson Electric Power Co | 2023 | 2.8 hrs | 0.98 | 62 min | 0.72 |
| 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 2023; 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, 2023, 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/2023/arizona/pima-county