Avista Corp

What This Utility Data Tells You

Avista Corp is a 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. As an investor-owned utility, it operates under state public utility commission oversight that reviews rate cases and reliability performance.

In 2023, the average Avista Corp customer experienced 173.0 minutes of power interruptions — a metric called SAIDI (System Average Interruption Duration Index). That sits within the 120–180 minute national benchmark range, indicating performance typical of U.S. distribution utilities. SAIFI — the average number of outage events per customer — was 1.02 for the same period, so customers statistically faced roughly 1 distinct interruption that year. Excluding major event days (hurricanes, ice storms), SAIDI drops to 163.0 minutes — the gap between that figure and the headline 173.0 reveals how much weather, not day-to-day infrastructure, drove outages.

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 has improved from 389.0 to 173.0 minutes over that window — a meaningful direction for prospective customers and regulators watching capital investment outcomes. All figures on this page come directly from EIA Form 861, the federal annual electric power industry survey, with service territory ZIPs sourced from OpenEI — you can cross-reference them with your own utility bill or use them when comparing providers before relocating.