Sioux Substation - 138 kV Electrical Substation in Texas, United States

Sioux Substation is an operational electrical substation located in Texas, United States, owned and operated by South Texas Electric Cooperative. The facility operates at a voltage of 138 kV, placing it in the medium-to-high voltage range typical for sub-transmission and distribution substations. As part of the Electric Reliability Council of Texas (ERCOT) grid, it plays a role in delivering power to rural and cooperative members in South Texas. The substation's technical specifications include a voltage level of 138 kV, which is common for regional transmission and distribution networks. In the United States, substations like Sioux are subject to NERC reliability standards and FERC regulations for grid stability, though as a cooperative-owned facility, it operates under the oversight of ERCOT and the Public Utility Commission of Texas. Typical substations of this voltage class use air-insulated or gas-insulated switchgear. Sioux Substation supports the electrical infrastructure of South Texas, an area with growing energy demand from agriculture, industry, and residential development. Its location near the Rio Grande Valley positions it to serve communities and integrate renewable energy sources such as wind and solar. The substation's operational status ensures continued reliability for the local grid, contributing to the region's economic and social well-being.

The substation is located in South Texas, a region characterized by a subtropical climate with hot summers and mild winters. The area is prone to extreme weather events such as hurricanes and flooding, which can pose risks to electrical infrastructure. The facility's design likely incorporates measures to withstand these conditions, such as elevated equipment and robust grounding. The surrounding landscape includes agricultural fields and urban development, with the substation's footprint minimized to reduce land use impact.