Castle Hills Substation - 138 kV Electrical Substation in San Antonio, Texas

Castle Hills Substation is an operational electrical substation located in San Antonio, Texas, United States. Owned and operated by CPS Energy, the facility plays a key role in the regional power distribution network, stepping down transmission-level voltage for local consumption. The substation operates at 138 kV, a common voltage level for subtransmission and distribution in the United States. As part of CPS Energy's infrastructure, it is subject to NERC reliability standards and FERC regulation, ensuring grid stability and compliance with federal guidelines. The facility's urban location in San Antonio supports a dense population and commercial area. Environmentally, the substation's operation is critical for maintaining reliable electricity supply to the surrounding community. Its integration into the broader Texas Interconnection grid helps balance load and generation, contributing to regional energy security. The facility's age and specific equipment are not detailed, but typical substations of this scale include switchgear and transformers with standard environmental safeguards.

Located in an urban area of San Antonio, the substation's environmental context is shaped by its role in supporting local electricity demand. The 138 kV voltage level indicates a medium-scale facility that connects transmission and distribution networks. Urban substations like this one are typically designed with noise mitigation and oil containment systems to minimize local impact.