SU FERC, LLC is an affiliate of Sharyland Utilities that focuses on new areas outside of the Electric Reliability Council of Texas (ERCOT) where significant transmission system improvements are needed. The following project provides additional support to help strengthen electric transmission with improving reliability, expanding access to markets, lowering the costs of delivered energy and allowing new generating resources to interconnect with existing systems.

Southline Transmission Project

On March 31, 2016, SU FERC, LLC commenced an open solicitation process for capacity on the Southline Transmission Project. SU FERC intends to allocate up to 100% of its capacity rights to customers through an open and transparent capacity allocation process.

The proposed Project consists of a “New Build” Section of approximately 240 miles of 345 kV double-circuit transmission line and associated facilities (connecting the existing Afton Substation, south of Las Cruces, New Mexico and the existing Apache Substation, south of Willcox, Arizona) and an “Upgrade” Section of approximately 120 miles of 115 kV Western Area Power Administration (“Western”) transmission line that would be upgraded to double-circuit 230 kV (connecting the Apache Substation to the existing Saguaro and Tortolita Substations northwest of Tucson, Arizona).

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