County annual report · FIPS 04013
2025 Maricopa County, AZ Power Outage Report
In 2025, customers in Maricopa County, AZ went without power for an average of 1.6 hours, a total of 2.9M customer-hours (Arizona average 1.6 hours). That ranks 8th worst of 15 Arizona counties and 2557th of 3,000 nationally.
Compared with AZ, the US and 2024
Coverage line is EAGLE-I's share of Arizona customers tracked each year.
Biggest outages in Maricopa County, 2025
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 24, 2025 06:30 | August 27, 2025 21:00 | 3d 14h | 62,447 | 233K |
| 2 | October 12, 2025 09:30 | October 18, 2025 04:45 | 5d 19h | 35,925 | 241K |
| 3 | August 19, 2025 13:15 | August 24, 2025 04:15 | 4d 15h | 21,519 | 96K |
| 4 | May 6, 2025 10:30 | May 8, 2025 00:15 | 1d 13h | 19,365 | 21K |
| 5 | August 10, 2025 23:45 | August 11, 2025 10:30 | 10h 45m | 18,927 | 15K |
| 6 | March 7, 2025 02:30 | March 9, 2025 00:45 | 1d 22h | 17,036 | 60K |
| 7 | July 2, 2025 11:45 | July 12, 2025 09:00 | 9d 21h | 14,184 | 134K |
| 8 | September 26, 2025 14:45 | September 29, 2025 07:15 | 2d 16h | 12,192 | 119K |
| 9 | August 8, 2025 20:45 | August 10, 2025 11:45 | 1d 15h | 9,947 | 14K |
| 10 | March 13, 2025 13:00 | March 15, 2025 01:00 | 1d 12h | 9,122 | 22K |
Outage episodes by size in 2025: 311 reached 100+ customers, 217 reached 1,000+ customers, 8 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 2025, 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 | 2024 | 87 min | 0.93 | 81 min | 0.88 |
| Salt River Project | 2024 | 58 min | 0.95 | 53 min | 0.90 |
| Gila River Indian Utility Authority (GRICUA) | 2024 | 4.5 hrs | 4.41 | 4.5 hrs | 4.41 |
| City of Mesa - (AZ) | 2024 | 64 min | 1.52 | 25 min | 0.66 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| USBIA-San Carlos Project | - | - | - | - | - |
| Tohono O'Odham Utility Authority | - | - | - | - | - |
| 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 2025; 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, 2025, 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/2025/arizona/maricopa-county