Southwest Gas Corporation is principally engaged in the business of purchasing, transporting and distributing natural gas to residential, commercial and industrial customers in the southwestern United States. Southwest\'s 2,500 employees serve over 1.5 million customers in Arizona, Nevada and portions of California. The company added approximately 67,000 customers in 2003, maintaining its status as one of the fastest-growing natural gas distribution companies in the nation (excluding mergers and acquisitions).