Memphis Light, Gas and Water is the nation's largest three-service municipal utility, serving nearly 430,000 customers. Since 1939, MLGW has met the utility needs of Memphis and Shelby County residents by delivering reliable and affordable electricity, natural gas and water service. Electricity is supplied to MLGW by the Tennessee Valley Authority, while natural gas is purchased from a variety of suppliers and transported by three pipeline companies � Texas Gas Transmission Corporation, Trunkline Gas Company and ANR Pipeline Company. Memphis receives its water from one of the largest artesian water systems in the world. MLGW is led by a president and a five-member board of commissioners who are appointed by the mayor of Memphis and approved by the Memphis City Council.