County annual report · FIPS 04013
2021 Maricopa County, AZ Power Outage Report
In 2021, customers in Maricopa County, AZ went without power for an average of 1.8 hours, a total of 3.2M customer-hours (Arizona average 1.9 hours). That ranks 8th worst of 13 Arizona counties and 2315th 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 Maricopa 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 | August 11, 2021 06:15 | August 23, 2021 12:00 | 12d 5h | 72,380 | 548K |
| 2 | January 25, 2021 15:15 | January 28, 2021 02:30 | 2d 11h | 51,106 | 153K |
| 3 | July 10, 2021 03:45 | July 14, 2021 22:45 | 4d 19h | 28,423 | 309K |
| 4 | July 17, 2021 00:30 | July 26, 2021 21:00 | 9d 20h | 23,617 | 263K |
| 5 | October 3, 2021 15:00 | October 6, 2021 23:00 | 3d 8h | 19,566 | 62K |
| 6 | November 14, 2021 23:00 | November 16, 2021 03:45 | 1d 4h | 11,948 | 30K |
| 7 | June 18, 2021 20:00 | June 20, 2021 21:15 | 2d 1h | 9,925 | 30K |
| 8 | October 11, 2021 13:00 | October 14, 2021 22:45 | 3d 9h | 9,638 | 46K |
| 9 | June 20, 2021 22:15 | June 27, 2021 05:45 | 6d 7h | 9,072 | 39K |
| 10 | July 14, 2021 23:45 | July 16, 2021 23:15 | 1d 23h | 8,669 | 18K |
Outage episodes by size in 2021: 321 reached 100+ customers, 207 reached 1,000+ customers, 6 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 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 |
| City of Mesa - (AZ) | 2021 | 52 min | 11.71 | 20 min | 0.69 |
| 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 91% of Arizona's customers in 2021; 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, 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/maricopa-county