County annual report · FIPS 04021
2021 Pinal County, AZ Power Outage Report
In 2021, customers in Pinal County, AZ went without power for an average of 5.0 hours, a total of 462K customer-hours (Arizona average 1.9 hours). That ranks 3rd worst of 13 Arizona counties and 1325th 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 Pinal 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 | July 10, 2021 04:15 | July 12, 2021 07:00 | 2d 2h | 15,541 | 166K |
| 2 | July 15, 2021 12:30 | July 15, 2021 20:00 | 7h 30m | 11,485 | 6,421 |
| 3 | August 17, 2021 05:30 | August 18, 2021 03:15 | 21h 45m | 6,129 | 17K |
| 4 | October 5, 2021 19:15 | October 6, 2021 11:30 | 16h 15m | 5,513 | 6,579 |
| 5 | September 18, 2021 22:00 | September 23, 2021 14:00 | 4d 16h | 3,490 | 5,167 |
| 6 | May 30, 2021 23:45 | May 31, 2021 02:00 | 2h 15m | 3,078 | 2,310 |
| 7 | February 2, 2021 09:45 | February 2, 2021 11:00 | 1h 15m | 3,042 | 3,803 |
| 8 | June 16, 2021 00:30 | June 16, 2021 04:45 | 4h 15m | 2,741 | 3,752 |
| 9 | February 27, 2021 15:45 | March 1, 2021 13:15 | 1d 21h | 2,435 | 5,949 |
| 10 | March 13, 2021 11:45 | March 13, 2021 13:45 | 2h | 2,426 | 2,316 |
Outage episodes by size in 2021: 110 reached 100+ customers, 51 reached 1,000+ customers, 2 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 Pinal 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 |
| Salt River Project | 2021 | 85 min | 1.01 | 48 min | 0.77 |
| Trico Electric Cooperative Inc | 2021 | 1.6 hrs | 0.75 | 57 min | 0.46 |
| Electrical Dist No2 Pinal County | 2021 | 17.1 hrs | - | 11.2 hrs | - |
| Electrical Dist No3 Pinal County | 2021 | 2.1 hrs | 1.39 | 48 min | 0.86 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| USBIA-San Carlos Project | - | - | - | - | - |
| Tohono O'Odham Utility Authority | - | - | - | - | - |
| Gila River Indian Utility Authority (GRICUA) | - | - | - | - | - |
| Ak-Chin Electric Utility Authority | - | - | - | - | - |
| Electrical Dist No4 Pinal County | - | - | - | - | - |
| Hohokam Irr & Drain Dist | - | - | - | - | - |
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 ÷ 92,098 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. Pinal County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Pinal 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/pinal-county