County annual report · FIPS 04023
2021 Santa Cruz County, AZ Power Outage Report
In 2021, customers in Santa Cruz County, AZ went without power for an average of 17.5 hours, a total of 23K customer-hours (Arizona average 1.9 hours). That ranks 1st worst of 13 Arizona counties and 486th of 2,974 nationally.
Compared with AZ, the US and 2020
Coverage line is EAGLE-I's share of Arizona customers tracked each year.
Biggest outages in Santa Cruz County, 2021
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 9, 2021 00:00 | August 9, 2021 03:45 | 3h 45m | 2,030 | 4,099 |
| 2 | August 28, 2021 22:15 | August 28, 2021 23:30 | 1h 15m | 2,030 | 2,538 |
| 3 | June 30, 2021 21:15 | June 30, 2021 21:45 | 30m | 2,009 | 1,005 |
| 4 | September 21, 2021 02:00 | September 21, 2021 02:45 | 45m | 1,372 | 700 |
| 5 | August 13, 2021 05:45 | August 13, 2021 06:30 | 45m | 1,370 | 1,028 |
| 6 | July 13, 2021 00:00 | July 13, 2021 02:45 | 2h 45m | 1,365 | 2,732 |
| 7 | July 11, 2021 01:30 | July 12, 2021 01:45 | 1d | 971 | 1,865 |
| 8 | December 24, 2021 21:45 | December 24, 2021 23:15 | 1h 30m | 639 | 959 |
| 9 | June 17, 2021 19:00 | June 18, 2021 06:45 | 11h 45m | 636 | 2,905 |
| 10 | April 30, 2021 00:00 | April 30, 2021 03:00 | 3h | 597 | 872 |
Outage episodes by size in 2021: 20 reached 100+ customers, 6 reached 1,000+ customers, 0 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 Santa Cruz County reported on EIA Form 861 for 2021, 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 | 2021 | 1.8 hrs | 1.02 | 87 min | 0.89 |
| Sulphur Springs Valley E C Inc | 2021 | 71 min | 0.67 | 52 min | 0.67 |
| Trico Electric Cooperative Inc | 2021 | 1.6 hrs | 0.75 | 57 min | 0.46 |
| UNS Electric, Inc | 2021 | 3.1 hrs | 1.05 | 48 min | 0.56 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 91% of Arizona's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 1,340 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. Santa Cruz County has data for 2016–2025.
Cite this report
MassOutage (massoutage.com), Santa Cruz County, AZ annual power outage report, 2021, 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/2021/arizona/santa-cruz-county