Sempra is a North American public utility holding company based in San Diego, California. The company is one of the largest utility holding companies in the United States, with nearly 40 million consumers. Sempra's focus is on electric and natural gas infrastructure. Its operating companies include Southern California Gas Company (SoCalGas) and San Diego Gas & Electric (SDGE) in Southern California; Oncor Electric Equipment Delivery Company in Texas; and Sempra Infrastructure, with offices in California and Texas.