County annual report · FIPS 04013
2018 Maricopa County, AZ Power Outage Report
In 2018, customers in Maricopa County, AZ went without power for an average of 2.1 hours, a total of 3.7M customer-hours (Arizona average 1.9 hours). That ranks 7th worst of 13 Arizona counties and 1806th 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 Maricopa 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 02:00 | July 10, 2018 04:30 | 1d 2h | 109,160 | 599K |
| 2 | August 8, 2018 11:30 | August 18, 2018 11:00 | 9d 23h | 63,297 | 598K |
| 3 | July 21, 2018 06:30 | July 31, 2018 15:15 | 10d 8h | 38,908 | 349K |
| 4 | July 10, 2018 05:45 | July 10, 2018 16:00 | 10h 15m | 31,409 | 165K |
| 5 | June 15, 2018 20:30 | June 25, 2018 23:00 | 10d 2h | 18,201 | 64K |
| 6 | August 20, 2018 09:00 | September 1, 2018 01:45 | 11d 16h | 17,427 | 164K |
| 7 | August 1, 2018 08:15 | August 6, 2018 21:45 | 5d 13h | 13,211 | 107K |
| 8 | October 4, 2018 00:45 | October 17, 2018 22:00 | 13d 21h | 11,704 | 113K |
| 9 | March 16, 2018 02:30 | March 16, 2018 20:15 | 17h 45m | 10,493 | 3,725 |
| 10 | February 13, 2018 10:45 | February 18, 2018 07:00 | 4d 20h | 9,013 | 30K |
Outage episodes by size in 2018: 157 reached 100+ customers, 110 reached 1,000+ customers, 9 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 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 |
| City of Mesa - (AZ) | 2018 | 33 min | 0.20 | 22 min | 0.10 |
| 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 87% of Arizona's customers in 2018; 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, 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/maricopa-county