County annual report · FIPS 04021
2018 Pinal County, AZ Power Outage Report
In 2018, customers in Pinal County, AZ went without power for an average of 5.1 hours, a total of 470K customer-hours (Arizona average 1.9 hours). That ranks 3rd worst of 13 Arizona counties and 1031st of 2,798 nationally.
Compared with AZ, the US and 2017
Coverage line is EAGLE-I's share of Arizona customers tracked each year.
Biggest outages in Pinal County, 2018
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 9, 2018 21:45 | July 10, 2018 16:30 | 18h 45m | 16,371 | 107K |
| 2 | July 31, 2018 01:45 | July 31, 2018 15:15 | 13h 30m | 12,044 | 26K |
| 3 | August 10, 2018 07:45 | August 11, 2018 04:45 | 21h | 6,701 | 16K |
| 4 | August 3, 2018 00:30 | August 6, 2018 12:45 | 3d 12h | 4,935 | 37K |
| 5 | August 6, 2018 13:45 | August 6, 2018 19:15 | 5h 30m | 3,885 | 5,915 |
| 6 | August 7, 2018 00:45 | August 7, 2018 01:00 | 15m | 3,874 | 969 |
| 7 | July 21, 2018 07:15 | July 21, 2018 22:15 | 15h | 3,532 | 16K |
| 8 | February 17, 2018 15:15 | February 17, 2018 16:30 | 1h 15m | 3,208 | 1,874 |
| 9 | July 10, 2018 20:00 | July 11, 2018 11:30 | 15h 30m | 3,077 | 8,368 |
| 10 | August 7, 2018 20:45 | August 8, 2018 21:30 | 1d | 2,949 | 16K |
Outage episodes by size in 2018: 96 reached 100+ customers, 44 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 2018, 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 | 2018 | 2.6 hrs | 1.08 | 86 min | 0.84 |
| Salt River Project | 2018 | 84 min | 0.83 | 37 min | 0.57 |
| Trico Electric Cooperative Inc | 2018 | 1.5 hrs | 0.66 | 28 min | 0.25 |
| Electrical Dist No3 Pinal County | 2018 | 2.4 hrs | 1.24 | 41 min | 0.59 |
| 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 No2 Pinal County | - | - | - | - | - |
| 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 87% of Arizona's customers in 2018; 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, 2018, 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/2018/arizona/pinal-county