Progress Updates

SunZia Capacity Allocation

November 17, 2021

SunZia Transmission, L.L.C. (SunZia) has commenced an open solicitation process for capacity on the proposed SunZia Southwest Transmission Project (Project). SunZia intends to allocate approximately 1500 MW of the Project’s remaining capacity through an open and transparent solicitation and capacity allocation process.

The Project consists of a single-circuit 500-kV high-voltage direct current (HVDC) line and associated substations that is expected to deliver primarily renewable energy on an approximately 550-mile route from central and southwestern New Mexico and southeastern Arizona to load-serving entities in Arizona, California, and other western markets. SunZia is offering firm transmission service from SunZia East to Pinal Central and Owl Head. SunZia expects to achieve commercial operation in 2025, with construction commencing in 2023.

Interested parties can learn more about the SunZia Southwest Transmission Project open solicitation process and how to participate by visiting For more information about the Project visit

In order to obtain transmission capacity rights on the Project, interested parties must submit a nonbinding Expression of Interest Form through the Open Solicitation website by December 17, 2021.