The Maryland Public Service Commission (PSC) is an independent administrative agency within the state government which regulates public utilities and certain taxi cab and other passenger services in Maryland. Similar to other state public utilities commissions, the Maryland PSC regulates and sets tariff rates for natural gas, electricity distribution, local telephone, water, and sewage disposal companies. The PSC also sets the tariff rates for pilot services for vessels and privately owned toll bridges, approves the construction of electric generating plants and overhead transmission lines with a voltage above 69 kV, and licenses retail natural gas and electricity suppliers.[1] The PSC offices are located in Baltimore in the William Donald Schaefer Building.