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 exceeds the 120–180 minute national benchmark by a wide margin, a pattern often tied to severe weather exposure, older infrastructure, or longer repair windows. Over the same period, SAIFI (outage events per customer) was 4.53, putting the typical customer at roughly 5 distinct interruptions that year. Once major event days (hurricanes, ice storms) are excluded, SAIDI comes down to 326.4 minutes, and the spread against the headline 435.6 indicates how much weather, versus routine infrastructure, drove the outage total.

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 climbed from 210.4 to 435.6 minutes over that window, a shift that can point to worsening weather exposure or delayed grid modernization.