County annual report · FIPS 04019
2024 Pima County, AZ Power Outage Report
In 2024, customers in Pima County, AZ went without power for an average of 2.1 hours, a total of 1.1M customer-hours (Arizona average 1.7 hours). That ranks 6th worst of 14 Arizona counties and 2367th of 2,990 nationally.
Compared with AZ, the US and 2023
Coverage line is EAGLE-I's share of Arizona customers tracked each year.
Biggest outages in Pima County, 2024
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 15, 2024 00:00 | July 17, 2024 14:00 | 2d 14h | 38,456 | 301K |
| 2 | July 11, 2024 15:15 | July 13, 2024 04:15 | 1d 13h | 20,461 | 93K |
| 3 | June 22, 2024 18:45 | June 24, 2024 17:30 | 1d 22h | 16,549 | 48K |
| 4 | July 8, 2024 15:30 | July 11, 2024 11:30 | 2d 20h | 10,197 | 32K |
| 5 | August 8, 2024 23:00 | August 10, 2024 18:00 | 1d 19h | 9,961 | 38K |
| 6 | June 24, 2024 22:00 | July 4, 2024 14:15 | 9d 16h | 9,148 | 31K |
| 7 | February 13, 2024 15:15 | February 13, 2024 22:30 | 7h 15m | 8,705 | 4,400 |
| 8 | August 3, 2024 00:15 | August 3, 2024 13:45 | 13h 30m | 8,262 | 29K |
| 9 | December 19, 2024 20:15 | December 19, 2024 20:45 | 30m | 8,046 | 4,023 |
| 10 | April 26, 2024 02:00 | April 26, 2024 08:30 | 6h 30m | 7,694 | 14K |
Outage episodes by size in 2024: 157 reached 100+ customers, 83 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 2024, 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 | 2024 | 87 min | 0.93 | 81 min | 0.88 |
| Sulphur Springs Valley E C Inc | 2024 | 2.3 hrs | 1.32 | 2.1 hrs | 0.92 |
| Trico Electric Cooperative Inc | 2024 | 2.5 hrs | 1.03 | 83 min | 0.68 |
| Tucson Electric Power Co | 2024 | 1.9 hrs | 0.99 | 68 min | 0.85 |
| 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 2024; 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, 2024, 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/2024/arizona/pima-county