County annual report · FIPS 04013
2015 Maricopa County, AZ Power Outage Report
In 2015, customers in Maricopa County, AZ went without power for an average of 0.5 hours, a total of 793K customer-hours (Arizona average 0.4 hours). That ranks 3rd worst of 6 Arizona counties and 2097th of 2,484 nationally.
Compared with AZ, the US
Coverage line is EAGLE-I's share of Arizona customers tracked each year.
Biggest outages in Maricopa County, 2015
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 18, 2015 23:00 | October 20, 2015 03:30 | 1d 4h | 21,506 | 96K |
| 2 | August 31, 2015 22:15 | September 2, 2015 21:30 | 1d 23h | 20,854 | 218K |
| 3 | November 9, 2015 08:00 | November 9, 2015 21:30 | 13h 30m | 20,800 | 8,194 |
| 4 | August 29, 2015 23:45 | August 31, 2015 21:30 | 1d 21h | 16,713 | 68K |
| 5 | November 17, 2015 01:00 | November 17, 2015 02:45 | 1h 45m | 8,898 | 12K |
| 6 | August 10, 2015 14:00 | August 13, 2015 06:00 | 2d 16h | 6,457 | 34K |
| 7 | October 31, 2015 13:45 | November 1, 2015 00:45 | 11h | 5,209 | 11K |
| 8 | November 10, 2015 06:15 | November 11, 2015 05:00 | 22h 45m | 5,110 | 11K |
| 9 | August 13, 2015 20:30 | August 15, 2015 22:00 | 2d 1h | 4,914 | 11K |
| 10 | September 12, 2015 11:45 | September 15, 2015 23:45 | 3d 12h | 4,833 | 19K |
Outage episodes by size in 2015: 118 reached 100+ customers, 68 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 2015, 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 | 2015 | 2.0 hrs | 0.91 | 87 min | 0.87 |
| Salt River Project | 2015 | 59 min | 0.81 | 42 min | 0.66 |
| City of Mesa - (AZ) | 2015 | 1.6 hrs | 0.68 | - | - |
| 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 2015; 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, 2015, 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/2015/arizona/maricopa-county