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About Us

Company Overview

We're more than a utility

UniSource Energy Services (UES) provides safe, reliable energy to more than 237,000 customers across Arizona. Our natural gas service reaches about 147,000 customers in northern and southern Arizona, while our electric service reaches more than 91,000 customers in Mohave and Santa Cruz Counties.

UES is a subsidiary of Tucson-based UNS Energy Corporation, which also serves as the corporate parent of Tucson Electric Power (TEP). Our approximately 350 employees are committed to maintaining high standards of service while contributing to our local communities.

Electric Service

UES provides electric service in Mohave and Santa Cruz Counties. Our service territory in Mohave County is located in the extreme northwest corner of the state. It includes both Kingman, located in the high desert central portion of the county, and Lake Havasu City, situated in the low desert along the Colorado River.

Our Santa Cruz County service territory serves customers in the south central portion of the state, approximately 60 miles south of Tucson adjacent to the U.S. border with Mexico. We provide service to most of the county, including Nogales - its largest city.

Natural Gas Service

UES provides natural gas service in Santa Cruz, Mohave, Yavapai, Coconino and Navajo Counties. Service map.

UNS Energy Corporation

UNS Energy Corporation is also the parent company of Tucson Electric Power, which serves more than 400,000 customers in southern Arizona. TEP has served the people of southern Arizona for more then 110 years.

For more information about UNS Energy Corporation and its subsidiaries, visit

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