Avista Corp

What This Utility Data Tells You

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.