Sempra is an energy-service holding company, which engages in the development and operation of energy infrastructure, and provision of electric and gas services. The company is headquartered in San Diego, California and currently employs 16,835 full-time employees. The firm's businesses invest in, develop and operate energy infrastructure, and provide electric and gas services to customers. The firm's segments include Sempra California, Sempra Texas Utilities and Sempra Infrastructure. The Sempra California segment provides natural gas and electric service to Southern California and part of central California through its subsidiaries, SDG&E and SoCalGas. The Sempra Texas Utilities segment holds its investment in Oncor Holdings, which owns over 80.25% interest in Oncor, a regulated electric transmission and distribution utility serving customers in the north-central, eastern, western and panhandle regions of Texas, and its indirect 50% interest in Sharyland Holdings, which owns Sharyland Utilities, a regulated electric transmission utility serving customers near the Texas-Mexico border. The Sempra Infrastructure segment develops, builds, operates and invests in energy infrastructure.