IOU · Idaho · EIA 20169
Avista Corp
IOU · Idaho · 270K customers. According to the U.S. Energy Information Administration's EIA Form 861, reliability for 2023 shows SAIDI 173 minutes/customer.
Reliability verdict
Avista Corp shows near-benchmark chronic reliability in 2023: 163 minutes SAIDI excluding major events across 270K customers.
- 173 min
- SAIDI 2023
- 1.02
- SAIFI 2023
- 163 min
- SAIDI ex-MED
- 270K
- 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 Avista Corp filings show
Avista Corp is an investor-owned utility operating in Idaho under EIA identifier 20169. It reports service to approximately 270,433 customer accounts and generated about $0.61 billion in annual electric revenue, with a service footprint spanning 201 ZIP codes. Because it is investor-owned, the state public utility commission oversees its rate cases and reliability performance rather than a local board.
In 2023, the average Avista Corp customer experienced 173.0 minutes of power interruptions, a measure known as SAIDI, or System Average Interruption Duration Index. That falls inside the typical 120–180 minute national benchmark, in line with what most U.S. distribution utilities report. The SAIFI figure, which tracks average outage events per customer, came in at 1.02 for the same period, meaning customers statistically saw about 1 distinct interruption that year. Once major event days (hurricanes, ice storms) are excluded, SAIDI comes down to 163.0 minutes, and the spread against the headline 173.0 indicates how much weather, versus routine infrastructure, drove the outage total.
The EIA dataset includes 4 years of continuous reporting (2020–2023) for Avista Corp, which lets you see whether reliability is trending up or down rather than judging from a single snapshot. SAIDI dropped from 389.0 to 173.0 minutes across that span, a direction regulators and prospective customers tend to watch closely.
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.
173 outage minutes per customer annually
Annual minutes without electric service (2023)
SAIDI by year (2020-2023)
Minutes per customer-year · EIA Form 861
Year-by-year SAIDI for Avista Corp from the same EIA filings as the table below. Lower is better; major-event years can spike the headline figure.
Avista Corp SAIDI trend
Avista Corp vs the nationwide SAIDI distribution
Where this utility's headline SAIDI sits among every EIA Form 861 utility with a reported figure
173 Around the middle fewer outage minutes than 48% 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 Avista Corp sits on price vs. reliability
Among the 781 U.S. utilities large enough to report both revenue per customer and a recent outage record, Avista Corp charges more per customer than 32% of them, and is more reliable (lower SAIDI) than 51% of them, placing it in the quadrant where it pays less while still being more reliable, the best-value quadrant. Revenue per customer and outage minutes are independent figures: paying more does not guarantee fewer outages.
Revenue per customer: $2,256/year · Latest SAIDI: 173.0 minutes/year.
SAIDI 2023 breakdown: 173.0 minutes
Reliability Trend (2020–2023)
| Year | SAIDI (min) | SAIDI nMED | SAIFI | Customers |
|---|---|---|---|---|
| 2020 | 389.0 | 146.0 | 1.640 | 156,205 |
| 2021 | 1378.0 | 198.0 | 2.970 | 135,616 |
| 2022 | 257.0 | 165.0 | 1.310 | 141,190 |
| 2023 | 173.0 | 163.0 | 1.020 | 142,909 |
SAIDI nMED = SAIDI without major event days. Source: EIA Form 861.
Service Area
Avista Corp serves 201 ZIP codes in Idaho.
Frequently Asked Questions
How reliable is Avista Corp?
Avista Corp had a SAIDI of 173.0 minutes in 2023. Excluding major weather events, this is near the national average.
What type of utility is Avista Corp?
Avista Corp is classified as a IOU serving Idaho.
How many customers does Avista Corp serve?
Avista Corp serves approximately 270,433 customers in Idaho.
How has Avista Corp's reliability changed over time?
Avista Corp has 4 years of reliability data (2020-2023). SAIDI has held roughly steady across these years. Review the trend table above for year-by-year detail.
Utility Profile
- Type
- IOU
- State
- Idaho
- Customers
- 270,433
- Annual Revenue
- $0.61B
- EIA ID
- 20169
Explore
Utilities with similar EIA profiles
Two cross-state peer sets for Avista Corp. 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 (270K here), outside Idaho.
Similar chronic SAIDI
Nearest utilities by latest SAIDI minutes (173.0 here), outside Idaho, 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.