IOU · Arizona · EIA 803
Arizona Public Service Co
IOU · Arizona · 1.4M customers. According to the U.S. Energy Information Administration's EIA Form 861, reliability for 2023 shows SAIDI 99 minutes/customer.
Reliability verdict
Arizona Public Service Co shows above-average chronic reliability in 2023: 82 minutes SAIDI excluding major events across 1.4M customers.
- 99 min
- SAIDI 2023
- 0.88
- SAIFI 2023
- 82 min
- SAIDI ex-MED
- 1.4M
- Customers
Chronic reliability judged on SAIDI excluding major event days when reported (IEEE 1366). Source: EIA Form 861 · August 2026.
Signature read: mid-cohort SAIDI between the 96 and 258 minute tercile cuts.
What mid-pack Arizona Public Service Co filings show
Arizona Public Service Co is an investor-owned utility operating in Arizona under EIA identifier 803. It reports service to approximately 1,370,930 customer accounts and generated about $4.34 billion in annual electric revenue, with a service footprint spanning 276 ZIP codes. Investor ownership puts this utility under the regulatory authority of the state public utility commission, which reviews its rate requests and reliability record.
In 2023, the average Arizona Public Service Co customer experienced 98.6 minutes of power interruptions, a measure known as SAIDI, or System Average Interruption Duration Index. That places this utility well below the 120–180 minute national benchmark, signaling strong grid hardening and fast restoration practices. Over the same period, SAIFI (outage events per customer) was 0.88, putting the typical customer at roughly 1 distinct interruption that year. Once major event days (hurricanes, ice storms) are excluded, SAIDI comes down to 82.1 minutes, and the spread against the headline 98.6 indicates how much weather, versus routine infrastructure, drove the outage total.
The EIA dataset includes 4 years of continuous reporting (2020–2023) for Arizona Public Service Co, which lets you see whether reliability is trending up or down rather than judging from a single snapshot. SAIDI climbed from 84.5 to 98.6 minutes over that window, a shift that can point to worsening weather exposure or delayed grid modernization.
Based on this utility's own EIA Form 861 reliability record -- baseline (major-event- excluded) outage duration, total outage duration, and outage frequency -- each benchmarked against every reporting utility nationwide. Not a measure of electricity rates or customer service, which this portal does not track.
99 min/year per customer
Annual minutes without electric service (2023)
SAIDI by year (2020-2023)
Minutes per customer-year · EIA Form 861
Year-by-year SAIDI for Arizona Public Service Co from the same EIA filings as the table below. Lower is better; major-event years can spike the headline figure.
Arizona Public Service Co SAIDI trend
Arizona Public Service Co vs the nationwide SAIDI distribution
Where this utility's headline SAIDI sits among every EIA Form 861 utility with a reported figure
99 Lower than most fewer outage minutes than 67% of 911 utilities
Utilities nationwide, banded by latest reported SAIDI (minutes)
Each bar is a band; taller bars hold more utilities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source U.S. EIA Form 861 reliability filings · August 2026
Price vs. reliability
Where Arizona Public Service Co sits on price vs. reliability
Among the 781 U.S. utilities large enough to report both revenue per customer and a recent outage record, Arizona Public Service Co charges more per customer than 80% of them, and is more reliable (lower SAIDI) than 70% of them, placing it in the quadrant where it pays more and is more reliable. Revenue per customer and outage minutes are independent figures: paying more does not guarantee fewer outages.
Revenue per customer: $3,164/year · Latest SAIDI: 98.6 minutes/year.
SAIDI 2023 breakdown: 98.6 minutes
Reliability Trend (2020–2023)
| Year | SAIDI (min) | SAIDI nMED | SAIFI | Customers |
|---|---|---|---|---|
| 2020 | 84.5 | 78.6 | 0.860 | 1,285,518 |
| 2021 | 106.5 | 87.4 | 1.020 | 1,314,670 |
| 2022 | 138.1 | 84.0 | 1.040 | 1,345,376 |
| 2023 | 98.6 | 82.1 | 0.880 | 1,370,252 |
SAIDI nMED = SAIDI without major event days. Source: EIA Form 861.
Service Area
Arizona Public Service Co serves 276 ZIP codes in Arizona.
Frequently Asked Questions
How reliable is Arizona Public Service Co?
Arizona Public Service Co had a SAIDI of 98.6 minutes in 2023. Excluding major weather events, this is below the national average, indicating above-average reliability.
What type of utility is Arizona Public Service Co?
Arizona Public Service Co is classified as a IOU serving Arizona.
How many customers does Arizona Public Service Co serve?
Arizona Public Service Co serves approximately 1,370,930 customers in Arizona.
How has Arizona Public Service Co's reliability changed over time?
Arizona Public Service Co has 4 years of reliability data (2020-2023). SAIDI has remained relatively stable over this period. Review the trend table above for year-by-year detail.
Utility Profile
- Type
- IOU
- State
- Arizona
- Customers
- 1,370,930
- Annual Revenue
- $4.34B
- EIA ID
- 803
Explore
Utilities with similar EIA profiles
Two cross-state peer sets for Arizona Public Service Co. Same-state SAIDI neighbors stay in Read-with below; these neighborhoods are nearest other-state utilities with at least 10,000 reported customers.
Similar customer count
Nearest utilities by Form 861 customers (1.4M here), outside Arizona.
Similar chronic SAIDI
Nearest utilities by latest SAIDI minutes (98.6 here), outside Arizona, excluding the customer-peer set.
Source: U.S. Energy Information Administration Form 861 annual electric power industry survey · ZIP service territory: OpenEI. Disclaimer: informational only, not professional advice. See full disclaimer · methodology.