County annual report · FIPS 04019
2025 Pima County, AZ Power Outage Report
In 2025, customers in Pima County, AZ went without power for an average of 1.0 hours, a total of 469K customer-hours (Arizona average 1.6 hours). That ranks 12th worst of 15 Arizona counties and 2771st of 3,000 nationally.
Compared with AZ, the US and 2024
Coverage line is EAGLE-I's share of Arizona customers tracked each year.
Biggest outages in Pima County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 27, 2025 04:00 | January 1, 2026 00:00 | 126d 20h | 18,508 | 195K |
| 2 | January 23, 2025 14:00 | January 23, 2025 23:30 | 9h 30m | 11,684 | 5,954 |
| 3 | February 7, 2025 15:00 | February 13, 2025 07:00 | 5d 16h | 10,157 | 35K |
| 4 | January 24, 2025 19:30 | January 30, 2025 22:30 | 6d 3h | 9,054 | 8,251 |
| 5 | June 17, 2025 15:30 | June 17, 2025 17:00 | 1h 30m | 8,712 | 2,183 |
| 6 | March 2, 2025 22:00 | March 20, 2025 20:30 | 17d 22h | 8,023 | 25K |
| 7 | February 25, 2025 15:00 | February 27, 2025 11:00 | 1d 20h | 7,846 | 6,536 |
| 8 | May 30, 2025 20:00 | May 30, 2025 20:15 | 15m | 5,556 | 1,389 |
| 9 | July 23, 2025 13:30 | July 23, 2025 16:45 | 3h 15m | 4,374 | 3,295 |
| 10 | June 8, 2025 15:30 | June 8, 2025 16:30 | 1h | 4,373 | 3,464 |
Outage episodes by size in 2025: 103 reached 100+ customers, 45 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 2025, 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 2025; 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, 2025, 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/2025/arizona/pima-county