County annual report · FIPS 04013
2020 Maricopa County, AZ Power Outage Report
In 2020, customers in Maricopa County, AZ went without power for an average of 1.3 hours, a total of 2.3M customer-hours (Arizona average 1.3 hours). That ranks 8th worst of 14 Arizona counties and 2541st of 3,019 nationally.
Compared with AZ, the US and 2019
Coverage line is EAGLE-I's share of Arizona customers tracked each year.
Biggest outages in Maricopa County, 2020
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 20, 2020 23:30 | August 23, 2020 00:00 | 2d | 49,571 | 227K |
| 2 | December 10, 2020 04:15 | December 11, 2020 10:30 | 1d 6h | 15,125 | 43K |
| 3 | August 11, 2020 14:00 | August 20, 2020 22:30 | 9d 8h | 13,411 | 115K |
| 4 | June 20, 2020 12:30 | June 20, 2020 17:15 | 4h 45m | 11,219 | 2,852 |
| 5 | March 12, 2020 01:30 | March 13, 2020 21:30 | 1d 20h | 9,919 | 56K |
| 6 | May 4, 2020 03:45 | May 7, 2020 10:00 | 3d 6h | 8,678 | 44K |
| 7 | August 8, 2020 21:45 | August 11, 2020 00:45 | 2d 3h | 8,372 | 52K |
| 8 | August 27, 2020 14:00 | August 31, 2020 22:15 | 4d 8h | 8,344 | 63K |
| 9 | April 25, 2020 10:30 | April 27, 2020 21:30 | 2d 11h | 7,981 | 30K |
| 10 | May 17, 2020 12:45 | May 18, 2020 09:45 | 21h | 7,352 | 14K |
Outage episodes by size in 2020: 273 reached 100+ customers, 171 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 2020, 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 | 2020 | 84 min | 0.86 | 79 min | 0.85 |
| Salt River Project | 2020 | 47 min | 0.75 | 41 min | 0.69 |
| City of Mesa - (AZ) | 2020 | 72 min | 0.63 | 37 min | 0.25 |
| 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 90% of Arizona's customers in 2020; 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, 2020, 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/2020/arizona/maricopa-county