SunZia Southwest Transmission Project
All dates below are specific to the schedule of the Environmental Review and Permitting processes for this project.
ENVIRONMENTAL REVIEW AND PERMITTING STATUS
ESTIMATED COMPLETION DATE OF ENVIRONMENTAL REVIEW AND PERMITTING
The SunZia Project includes two nominal 500-kV transmission lines located on federal, state, and private lands between central New Mexico and central Arizona. The approximately 550-mile-long transmission line route originates at the planned SunZia East Substation in Torrance County, New Mexico, and terminates near the existing Saguaro substation and the existing Pinal Central Substation, both in Pinal County, Arizona. The SunZia Project is located in Socorro, Sierra, Luna, Grant, Hidalgo, and Torrance counties in New Mexico and Graham, Greenlee, Cochise, Pinal, and Pima counties in Arizona.
The SunZia Project will be constructed in two phases and ultimately include two, new, single-circuit, 500 kV transmission lines with the intent of locating both within a single 400-foot-wide right-of-way, where possible. Only one of the two 500-kV circuits will be constructed in Phase 1 and the planned in-service date for the first transmission line is 2025. The first transmission line would be a direct-current (DC) line and the second transmission line would be an alternating-current (AC) line.