How reliable is the power in Arizona?
Arizona ranks 8th of 45 states without major events and 2nd with them (1st = fewest minutes), 60 below the U.S. 129 and 579 below the U.S. 662. Major events added 13 minutes, 16% of the with-events total. The figure covers 3,294,764 customers, 93% of the 3,546,423 EIA lists for Arizona.
Arizona with and without major events
minutes without power per customer, 2024, Arizona and U.S.
- 69Arizona, no major events
- 129U.S., no major events
- 82Arizona, with major events
- 662U.S., with major events
| Measure | Arizona without | Arizona with | U.S. without | U.S. with |
|---|---|---|---|---|
| SAIDI, minutes per customer | 69 | 82 | 129 | 662 |
| SAIFI, interruptions per customer | 0.88 | 0.96 | 1.06 | 1.53 |
| CAIDI, minutes per interruption | 79 | 86 | 122 | 433 |
| Median utility, SAIDI minutes | 68 | 87 | — | — |
Which Arizona utilities move the number
Arizona Public Service Co serves 42% of the customers in the Arizona figure: 45% of lost customer-minutes with major events, 50% without. Without Arizona Public Service Co, the weighted figure would be 79 minutes with major events and 61 without, against 82 and 69.
- Arizona Public Service Co: 1,395,614 customers (42%), 81 min without and 87 with; 45% of lost minutes with major events, 50% without.
- Salt River Project: 1,161,925 customers (35%), 53 min without and 58 with; 25% of lost minutes with major events, 27% without.
- Tucson Electric Power Co: 455,579 customers (14%), 68 min without and 113 with; 19% of lost minutes with major events, 14% without.
All Arizona utilities in the 2024 file
37 utilities in the 2024 EIA-861 files for Arizona: 12 follow IEEE 1366, 1 uses another method, 24 filed no reliability figures. 13 are listed.
| City of Mesa - (AZ) | Municipal | IEEE 1366 | 17,975 | 25 | 64 | 0.66 | 1.52 | 62 | 1 of 8 | — |
|---|---|---|---|---|---|---|---|---|---|---|
| Salt River Project | Political Subdivision | IEEE 1366 | 1,161,925 | 53 | 58 | 0.90 | 0.95 | 9 | 2 of 8 | — |
| UNS Electric, Inc | Investor Owned | IEEE 1366 | 106,739 | 60 | 72 | 0.69 | 0.79 | 17 | 3 of 8 | — |
| Tucson Electric Power Co | Investor Owned | IEEE 1366 | 455,579 | 68 | 113 | 0.85 | 0.99 | 40 | 4 of 8 | — |
| Arizona Public Service Co | Investor Owned | IEEE 1366 | 1,395,614 | 81 | 87 | 0.88 | 0.93 | 7 | 5 of 8 | — |
| Trico Electric Cooperative Inc | Cooperative | IEEE 1366 | 54,860 | 83 | 150 | 0.68 | 1.03 | 45 | 6 of 8 | — |
| Electrical Dist No3 Pinal County | Political Subdivision | IEEE 1366 | 34,000 | 86 | 132 | 1.24 | 1.55 | 35 | 7 of 8 | — |
| Sulphur Springs Valley E C Inc | Cooperative | IEEE 1366 | 54,402 | 125 | 138 | 0.92 | 1.32 | 10 | 8 of 8 | — |
| Mohave Electric Cooperative, Inc. | Cooperative | IEEE 1366 | 45,123 | 118 | 171 | — | — | — | Not ranked | — |
| Navajo Tribal Utility Authority | State | Other method | 31,089 | 305 | 507 | 2.86 | 3.59 | — | Not ranked | other method, not comparable |
| Electrical Dist No2 Pinal County | Political Subdivision | IEEE 1366 | 6,943 | 31 | 53 | 0.44 | 0.81 | 42 | Not ranked | under 10,000 customers |
| Gila River Indian Utility Authority (GRICUA) | Cooperative | IEEE 1366 | 3,582 | 267 | 267 | 4.41 | 4.41 | 0 | Not ranked | under 10,000 customers |
| Dixie Escalante R E A, Inc | Cooperative | IEEE 1366 | 3,145 | 55 | 55 | 0.60 | 0.60 | 0 | Not ranked | under 10,000 customers |
Arizona utilities with no reliability figures
24 in the sales file, no SAIDI or SAIFI row.
| Utility | Type | Customers |
|---|---|---|
| Navopache Electric Coop, Inc | Cooperative | 44,128 |
| Tesla Inc. | Behind the Meter | 41,060 |
| Sunrun Inc. | Behind the Meter | 40,061 |
| USBIA-San Carlos Project | Federal | 13,341 |
| SunPower Capital, LLC | Behind the Meter | 11,459 |
| Morenci Water and Electric | Investor Owned | 2,630 |
| Garkane Energy Coop, Inc | Cooperative | 1,813 |
| Ajo Improvement Co | Investor Owned | 1,031 |
| Electrical Dist No8 Maricopa | Political Subdivision | 695 |
| Ak-Chin Electric Utility Authority | State | 466 |
| TerraForm US Energy Services, LLC | Behind the Meter | 29 |
| WAPA-- Western Area Power Administration | Federal | 20 |
| Greenbacker Renewable Energy Corporation | Behind the Meter | 4 |
| Tohono O'Odham Utility Authority | Political Subdivision | — |
| Electrical Dist No4 Pinal County | Political Subdivision | — |
| Hohokam Irr & Drain Dist | Political Subdivision | — |
| Page Utility Enterprises | Municipal | — |
| Graham County Electric Coop Inc | Cooperative | — |
| Duncan Valley Elec Coop, Inc | Cooperative | — |
| Aha Macav Power Service | Political Subdivision | — |
| Town of Thatcher- (AZ) | Municipal | — |
| City of Safford - (AZ) | Municipal | — |
| Colorado River Indian Irr Proj | Federal | — |
| Columbus Electric Coop, Inc | Cooperative | — |
The biggest Arizona utilities against the U.S.
- Arizona Public Service Co (investor owned, 40% of Arizona customers in the file): SAIDI without major events 81 min, 48 below the U.S. 129; with major events 87 min against 662.
- Salt River Project (political subdivision, 33% of Arizona customers in the file): SAIDI without major events 53 min, 76 below the U.S. 129; with major events 58 min against 662.
- Tucson Electric Power Co (investor owned, 13% of Arizona customers in the file): SAIDI without major events 68 min, 61 below the U.S. 129; with major events 113 min against 662.
- UNS Electric, Inc (investor owned, 3% of Arizona customers in the file): SAIDI without major events 60 min, 69 below the U.S. 129; with major events 72 min against 662.
- Trico Electric Cooperative Inc (cooperative, 2% of Arizona customers in the file): SAIDI without major events 83 min, 46 below the U.S. 129; with major events 150 min against 662.
Arizona by type of utility
Among Arizona utilities that report under IEEE 1366, municipal utilities average 25 minutes without major events and cooperative utilities 108.
| Type | Utilities | Customers | SAIDI without | Median utility | SAIDI with |
|---|---|---|---|---|---|
| Investor Owned | 3 | 1,957,932 | 77 | 68 | 92 |
| Political Subdivision | 3 | 1,202,868 | 54 | 53 | 60 |
| Cooperative | 4 | 115,989 | 108 | 104 | 146 |
| Municipal | 1 | 17,975 | 25 | 25 | 64 |
Next to Arizona in the ranking
Arizona report card
Smart meters: 95% of residential meters, 11 utilities (U.S. 92%). Arizona time-based rates: 9 of 12 utilities, 39.8% of residential customers enrolled (U.S. 10.6%). Arizona efficiency spend: $35.0 per customer (U.S. $124.2). Demand response: 125 W per customer (U.S. 77). Arizona net-metered systems: 90.9 per 1,000 customers. Rankings.
Is your Arizona utility better or worse than the Arizona median?
- Loading.
More
- Arizona against all states
- Arizona utilities among the best and worst
- Arizona utility reliability and price by company
- Arizona major outage reports from the Department of Energy
- Arizona electricity prices
- Arizona help with your bill
13 Arizona filings in EIA-861 2024 (retrieved 2026-10-01), 8 ranked utilities. Method and sources.
Questions
How many minutes without power did the average Arizona customer have in 2024?
69 minutes without major events and 82 with them (12 IEEE 1366 utilities, customer-weighted).
Why do the two Arizona numbers differ so much?
Major events add 13 of the 82 minutes (16%); Arizona Public Service Co supplies 45% of the with-events total.
Which Arizona utility reported the fewest and the most minutes?
Among 8 utilities with 10,000+ customers: City of Mesa - (AZ) 25 minutes without major events, and Sulphur Springs Valley E C Inc 125.
Which Arizona utilities use which method?
12 follow IEEE 1366, 1 uses another method, 24 filed no reliability figures.