Navajo Tribal Utility Authority, AZ
Power reliability at Navajo Tribal Utility Authority
Arizona's grid here runs a bit rougher than most: 2.3 outages from Navajo Tribal Utility Authority in the most recent year, 3.6 hours total. That is 191% more outage time than the Arizona state average of 74 minutes a year.
What a typical outage at Navajo Tribal Utility Authority looks like
A single outage here averages 1.6 hours. That is squarely in battery-power-station range; a fuel generator is overkill for most of these. Why outage length, not count, picks the backup: how often vs how long.
The generator question for Navajo Tribal Utility Authority
Serving 30,319 customers here, Given how often Navajo Tribal Utility Authority goes out, you should consider a backup generator rather than treat it as optional.
How Navajo Tribal Utility Authority's record was measured
These figures come from EIA Form 861, the reliability report a state-run utility like Navajo Tribal Utility Authority files with federal regulators every year - serving 30,319 customers hereaveraged across the whole territory, not any one address or storm. Want the Arizona average instead of just this one utility? Arizona's statewide record is here. Storm days are counted in - here is why.