Potranco Substation - 138 kV Electrical Substation in San Antonio, Texas

Potranco Substation is an operational electrical substation located in San Antonio, Texas, United States. Owned and operated by CPS Energy, the facility is a key component of the local power distribution network, stepping down transmission voltage for residential and commercial use. The substation operates at a voltage of 138 kV, a common level for subtransmission systems that connect high-voltage transmission lines to lower-voltage distribution networks. As part of CPS Energy's infrastructure, it adheres to North American Electric Reliability Corporation (NERC) reliability standards and is regulated by the Federal Energy Regulatory Commission (FERC) for interstate aspects, along with state-level oversight by the Public Utility Commission of Texas. Potranco Substation plays a vital role in maintaining grid stability and reliability for the San Antonio area. Its location in a growing urban region underscores its importance in meeting increasing electricity demand and supporting community resilience.

The substation is situated in an urban area of San Antonio, Texas, where land use is predominantly residential and commercial. Electrical infrastructure in such settings must consider electromagnetic field (EMF) exposure limits and stormwater management for transformer oil containment. The facility's 138 kV operation places it in a moderate voltage class, with standard environmental mitigation measures including spill containment and noise reduction.