UNS Electric, Inc

What This Utility Data Tells You

UNS Electric, Inc is an investor-owned utility operating in Arizona under EIA identifier 19728. It reports service to approximately 106,045 customer accounts and generated about $0.25 billion in annual electric revenue, with a service footprint spanning 46 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 UNS Electric, Inc customer experienced 164.8 minutes of power interruptions, a measure known as SAIDI, or System Average Interruption Duration Index. Excluding major weather events from that total, that places this utility well below the 120–180 minute national benchmark, signaling strong grid hardening and fast restoration practices. SAIFI, the average number of outage events per customer, was 0.78 for the same period, so customers statistically faced roughly 1 distinct interruption that year. Excluding major event days (hurricanes, ice storms), SAIDI drops to 44.1 minutes, the gap between that figure and the headline 164.8 reveals how much weather, not day-to-day infrastructure, drove outages.

With 4 consecutive years of EIA data (2020–2023), UNS Electric, Inc's reliability record can be judged on trend rather than one isolated year. SAIDI has increased from 43.2 to 164.8 minutes, which may reflect either worsening weather exposure or delayed grid modernization.