As the owner’s agent, AECOM provided project management, contract management, material coordination and construction inspection services for one of the largest transmission construction projects in the west, the Arizona Public Service (APS) Hassayampa to North Gila #2 (HANG2) 500kV Transmission Line project. The new 112-mile transmission line runs from the Hassayampa substation in Phoenix, Arizona, to the North Gila substation in Yuma, Arizona, and is now energized and supplying electricity to APS customers across Arizona.

AECOM’s team provided a variety of services to ensure the project met the client’s ambitious schedule, budget and quality targets—and with zero lost-time incidents.

The 112-mile 500kV transmission line is comprised of 389 structures, including lattice towers, monopoles, H-frames and one Y-structure and parallels an existing energized 500 kV line.

During the course of the project, the HANG2 team faced many challenges, including weather conditions such as extreme desert heat, high winds and dust storms, and monsoon rain conditions that washed out access roads and moved boulders blocking access.

All aspects of the project were closely monitored to minimize impacts to wildlife and to protect all historical and archeological sites.

APS began construction planning for the HANG2 line more than a decade ago, as southwest Arizona’s population began to rapidly expand. According to census data, Yuma County’s population has increased by 27 percent since 2000, making it the third fastest-growing county in the United States. APS understood the essential need to increase its capacity to bring electricity into Yuma County and initiated the HANG2 line, which now increases the infrastructure reliability for the entire desert southwest.