Old Town Substation: San Diego Electrical Substation Operated by SDG&E

Old Town Substation is an operational electrical substation located in San Diego, California, United States. It is owned and operated by San Diego Gas & Electric (SDG&E), a major utility serving the San Diego region. The substation handles voltage levels of 230 kV and 69 kV, indicating its role in both transmission and distribution within the local power grid. As a substation operating under the jurisdiction of the United States, it adheres to the North American Electric Reliability Corporation (NERC) reliability standards and is subject to Federal Energy Regulatory Commission (FERC) regulation for transmission-level assets. The facility's dual voltage levels suggest it serves as a critical node for stepping down high-voltage transmission power to lower voltages for distribution to residential, commercial, and industrial customers in the area. Old Town Substation plays a key role in maintaining grid stability and reliability for the San Diego metropolitan area. Its location in an urban setting underscores its importance in meeting the electricity demands of a densely populated region. The substation's operational status and integration into SDG&E's network contribute to the overall resilience of California's electrical infrastructure.

The substation is situated in an urban environment in San Diego, which is characterized by a Mediterranean climate with mild, wet winters and warm, dry summers. The facility's operation supports the local grid's ability to manage peak demand during hot summer months when air conditioning use is high. The surrounding area includes residential neighborhoods and commercial zones, and the substation's design likely incorporates measures to mitigate visual and noise impacts on the community.