Navajo Tribal Utility Authority

What This Utility Data Tells You

Navajo Tribal Utility Authority is a state utility operating in Arizona under EIA identifier 13314. It reports service to approximately 30,628 customer accounts and generated about $0.08 billion in annual electric revenue, with a service footprint spanning 90 ZIP codes.

In 2023, the average Navajo Tribal Utility Authority customer experienced 435.6 minutes of power interruptions — a metric called SAIDI (System Average Interruption Duration Index). That is substantially above the 120–180 minute national benchmark, indicating either storm-prone geography, aging infrastructure, or extended restoration windows. SAIFI — the average number of outage events per customer — was 4.53 for the same period, so customers statistically faced roughly 5 distinct interruptions that year. Excluding major event days (hurricanes, ice storms), SAIDI drops to 326.4 minutes — the gap between that figure and the headline 435.6 reveals how much weather, not day-to-day infrastructure, drove outages.

The EIA dataset includes 4 years of continuous reporting (2020–2023) for Navajo Tribal Utility Authority, which lets you see whether reliability is trending up or down rather than judging from a single snapshot. SAIDI has increased from 210.4 to 435.6 minutes, which may reflect either worsening weather exposure or delayed grid modernization. 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.