IOU · Arizona · EIA 24211
Tucson Electric Power Co
IOU · Arizona · 450K customers. According to the U.S. Energy Information Administration's EIA Form 861, reliability for 2023 shows SAIDI 169 minutes/customer.
Reliability verdict
Tucson Electric Power Co shows above-average chronic reliability in 2023: 62 minutes SAIDI excluding major events (169 minutes including them) across 450K customers.
- 169 min
- SAIDI 2023
- 0.98
- SAIFI 2023
- 62 min
- SAIDI ex-MED
- 450K
- 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 Tucson Electric Power Co filings show
Tucson Electric Power Co is an investor-owned utility operating in Arizona under EIA identifier 24211. It reports service to approximately 449,674 customer accounts and generated about $1.18 billion in annual electric revenue, with a service footprint spanning 64 ZIP codes. As an investor-owned utility, it operates under state public utility commission oversight that reviews rate cases and reliability performance.
In 2023, the average Tucson Electric Power Co customer experienced 168.7 minutes of power interruptions, the industry-standard SAIDI metric (System Average Interruption Duration Index). Excluding major weather events from that total, that is comfortably under the 120–180 minute national benchmark range, a sign of solid grid resilience and quick outage response. SAIFI, the average number of outage events per customer, was 0.98 for the same period, so customers statistically faced roughly 1 distinct interruption that year. Excluding major event days (hurricanes, ice storms), SAIDI drops to 61.9 minutes, the gap between that figure and the headline 168.7 reveals how much weather, not day-to-day infrastructure, drove outages.
The EIA dataset includes 4 years of continuous reporting (2020–2023) for Tucson Electric Power Co, which lets you see whether reliability is trending up or down rather than judging from a single snapshot. Over that span, SAIDI rose from 60.0 to 168.7 minutes, possibly reflecting tougher weather years or grid upgrades that have not caught up yet.
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.
169 min/year per customer
Minutes without power per year (2023)
SAIDI by year (2020-2023)
Minutes per customer-year · EIA Form 861
Year-by-year SAIDI for Tucson Electric Power Co from the same EIA filings as the table below. Lower is better; major-event years can spike the headline figure.
Tucson Electric Power Co SAIDI trend
Tucson Electric Power Co vs the nationwide SAIDI distribution
Where this utility's headline SAIDI sits among every EIA Form 861 utility with a reported figure
169 Around the middle fewer outage minutes than 49% 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 Tucson Electric Power 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, Tucson Electric Power Co charges more per customer than 56% of them, and is more reliable (lower SAIDI) than 52% 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: $2,624/year · Latest SAIDI: 168.7 minutes/year.
SAIDI 2023 breakdown: 168.7 minutes
Reliability Trend (2020–2023)
| Year | SAIDI (min) | SAIDI nMED | SAIFI | Customers |
|---|---|---|---|---|
| 2020 | 60.0 | - | 0.710 | 440,110 |
| 2021 | 102.1 | - | 0.910 | 444,582 |
| 2022 | 68.8 | - | 0.800 | 448,803 |
| 2023 | 168.7 | 61.9 | 0.976 | 450,434 |
SAIDI nMED = SAIDI without major event days. Source: EIA Form 861.
Service Area
Tucson Electric Power Co serves 64 ZIP codes in Arizona.
Frequently Asked Questions
How reliable is Tucson Electric Power Co?
Tucson Electric Power Co had a SAIDI of 168.7 minutes in 2023 including major weather events, but 61.9 minutes excluding them (the IEEE-standard measure of day-to-day reliability, the gap reflects a major storm that year, not chronic performance). Excluding major weather events, this is below the national average, indicating above-average reliability.
What type of utility is Tucson Electric Power Co?
Tucson Electric Power Co is classified as a IOU serving Arizona.
How many customers does Tucson Electric Power Co serve?
Tucson Electric Power Co serves approximately 449,674 customers in Arizona.
How has Tucson Electric Power Co's reliability changed over time?
Tucson Electric Power Co has 4 years of reliability data (2020-2023). This utility's SAIDI has stayed fairly flat over the period. Review the trend table above for year-by-year detail.
Utility Profile
- Type
- IOU
- State
- Arizona
- Customers
- 449,674
- Annual Revenue
- $1.18B
- EIA ID
- 24211
Explore
Utilities with similar EIA profiles
Two cross-state peer sets for Tucson Electric Power 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 (450K here), outside Arizona.
Similar chronic SAIDI
Nearest utilities by latest SAIDI minutes (168.7 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.