SDG&E is a regulated public utility that provides energy service to 3.6 million people through 1.4 million electric meters and 873,000 natural gas meters in San Diego and southern Orange counties. Our service area spans 4,100 square miles. Employees We employ more than 4,000 people who work every day to deliver the energy our customers need. Our Parent Company Sempra Energy is a San Diego-based Fortune 500 energy services holding company whose subsidiaries provide electricity, natural gas and value-added products and services. San Diego Gas & Electric and Southern California Gas Co. are Sempra Energy's regulated California utilities. Beginnings