Southwest Gas Corporation is a publicly traded company that serves more than 1.5 million clients in Arizona, Nevada, and California. It provides a range of natural gas purchasing, distribution and transportation services. The corporation serves residential, commercial and industrial customers in the southwestern United States. Southwest Gas Corporation maintains a staff of over 2,400 employees. The corporation uses an automated account system, as well as offers electronic billing services. Its affiliates include Carson Water Company, Pataya Storage Company and Total Energy Construction. Southwest Gas Corporation provides online energy saving tips and bill payment solutions. The corporation also administers landlord agreement, referral and third-party notification programs.