Sempra is a North American energy infrastructure company based in San Diego, California. The company is one of the largest utility holding companies in the United States with roughly 40 million consumers. Sempra's focus is on electric and natural gas infrastructure and its operating companies include: Southern California Gas Company (SoCalGas) and San Diego Gas & Electric (SDG&E) in Southern California; Oncor Electric Delivery Company in Texas; and Sempra Infrastructure, with offices in San Diego, Houston and Mexico City.