Public utilities provide electric, gas, water or telephone service to customers in a specified area. Utilities have a duty to provide safe and adequate service on reasonable terms to anyone who lives within the service area on without discriminating between customers. Because most utilities operate in near monopolistic conditions, they can be heavily regulated by local, state, and federal authorities. Generally, the local and state agencies are called Public Service Commissions (PSC) or Public Utility Commissions (PUC). Municipal Utilities and Rural Electric Cooperatives may be unregulated though.
Mangum is a city in Greer County, Oklahoma, United States. The population was 2,924 at the 2000 census. It is the county seat of Greer County. Mangum is home to the fourth longest-lasting light bulb, located in a fire house, according to the The Guinness Book of World Records.