County annual report · FIPS 04013
2017 Maricopa County, AZ Power Outage Report
In 2017, customers in Maricopa County, AZ went without power for an average of 1.1 hours, a total of 2.0M customer-hours (Arizona average 1.1 hours). That ranks 7th worst of 13 Arizona counties and 1981st of 2,786 nationally.
Compared with AZ, the US and 2016
Coverage line is EAGLE-I's share of Arizona customers tracked each year.
Biggest outages in Maricopa County, 2017
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 14, 2017 01:15 | July 21, 2017 00:30 | 6d 23h | 29,824 | 224K |
| 2 | July 31, 2017 21:00 | August 9, 2017 00:15 | 8d 3h | 26,961 | 160K |
| 3 | August 9, 2017 02:00 | August 14, 2017 14:00 | 5d 12h | 14,952 | 87K |
| 4 | January 21, 2017 01:15 | January 21, 2017 22:00 | 20h 45m | 12,364 | 64K |
| 5 | July 21, 2017 01:15 | July 28, 2017 23:30 | 7d 22h | 9,645 | 75K |
| 6 | June 19, 2017 13:30 | June 21, 2017 20:00 | 2d 6h | 8,814 | 38K |
| 7 | July 7, 2017 11:30 | July 14, 2017 00:00 | 6d 12h | 8,703 | 81K |
| 8 | July 29, 2017 02:30 | July 31, 2017 20:15 | 2d 17h | 7,956 | 33K |
| 9 | April 28, 2017 23:15 | May 3, 2017 00:15 | 4d 1h | 7,006 | 19K |
| 10 | March 21, 2017 14:45 | March 23, 2017 00:15 | 1d 9h | 6,381 | 17K |
Outage episodes by size in 2017: 171 reached 100+ customers, 100 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 Maricopa County reported on EIA Form 861 for 2017, 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 | 2017 | 1.9 hrs | 0.91 | 75 min | 0.75 |
| Salt River Project | 2017 | 48 min | 0.68 | 38 min | 0.60 |
| City of Mesa - (AZ) | 2017 | 48 min | 0.77 | - | - |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| USBIA-San Carlos Project | - | - | - | - | - |
| Tohono O'Odham Utility Authority | - | - | - | - | - |
| Gila River Indian Utility Authority (GRICUA) | - | - | - | - | - |
| Buckeye Water C&D District | - | - | - | - | - |
| Electrical Dist No8 Maricopa | - | - | - | - | - |
| Harquahala Valley Pwr District | - | - | - | - | - |
| Maricopa County M W C Dist #1 | - | - | - | - | - |
| Ocotillo Water Conserv. Dist. | - | - | - | - | - |
| Town of Wickenburg | - | - | - | - | - |
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 2017; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 1,742,493 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. Maricopa County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Maricopa County, AZ annual power outage report, 2017, 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/2017/arizona/maricopa-county