San Diego Gas & Electric (SDG&E) digs doling out energy in sunny Southern California. The Sempra Energy company is a regulated utility that serves 1.4 million electricity customers and more than 840,000 natural gas customers in San Diego County and a portion of southern Orange County. The electric utility segment owns 22,360 miles of power distribution lines, which serve about 25 communities; its 1,920 miles of transmission lines are managed by the California Independent System Operator. SDG&E also has limited power generation operations (it owns or contracts 4,520 MW of generating capacity). The gas utility operates almost 170 miles of transmission pipelines and about 8,460 miles of distribution mains.