Oncor Electric Delivery Company on May 11 filed with the Public Utility Commission of Texas an application for a certificate of convenience and necessity for the proposed double-circuit Dune Switch Loop 138-kV Transmission Line Project.
The approximately two-mile line would be built on steel or concrete monopole structures between the proposed Dune Switch station and the existing Oncor Wink-Yukon 138-kV transmission line in Winkler County, Texas. Oncor added that the proposed Dune Switch station would be located about three miles south of State Highway 302 and about nine miles west of Notrees, Texas, just west of the Phoebe Energy Project, LLC (Phoebe) facilities in Winkler County. The existing Oncor Wink-Yukon 138-kV transmission line is about two miles south of the proposed Dune Switch station, Oncor said.
The proposed project includes modifications at the loop connection point of Oncor’s existing Wink-Yukon 138-kV line and construction of the proposed Dune Switch station. Oncor added that that work may include dead-end structures, transformers, grading, fences, and other equipment.
The project area is situated in a relatively remote portion of Winkler County, and no incorporated cities, unincorporated towns, or communities are within the project area. Oncor added that almost the entirety of the study area consists of rural and undeveloped land used primarily for livestock grazing or oil and gas production.
Discussing the need for the proposed project, Oncor noted that it and Phoebe have signed an ERCOT standard generation interconnection agreement (SGIA) for Oncor to provide transmission service to Phoebe’s new substation, located in Winkler County. Phoebe is installing a new solar generation facility in the area and plans to build, own, and operate its own substation just east of the proposed Oncor Dune Switch station. Oncor added that Phoebe’s projected maximum peak output for its generation facility is 250 MW.
Oncor said that in order to provide transmission facilities necessary to interconnect Phoebe’s new substation and generation facility to the electric grid, it is proposing to build, own, and operate the 138-kV transmission line extension looping the existing Wink-Yukon 138-kV line.
The transmission facilities portion of the project has an estimated total cost of about $2.9m, while the substation facilities portion has an estimated total cost of about $4m, Oncor said.
According to the project’s estimated schedule, construction of the facilities would begin in December and be completed in April 2019, which is also when the facilities would be energized.