American Electric Power Company, Inc., a public utility holding company, engages in the generation, transmission, and distribution of electricity for sale to retail and wholesale customers. The company generates electricity using coal and lignite, natural gas, nuclear, and hydroelectric and other energy sources. It also supplies and markets electric power at wholesale to other electric utility companies, rural electric cooperatives, municipalities, and other market participants. As of January 28, 2015, the company delivered electricity to approximately 5.3 million customers in 11 states. In addition, it transports liquid, coal, and dry bulk commodities primarily on the Ohio, Illinois, and lower Mississippi rivers. The company owns and leases approximately 2,300 barges, 37 towboats, and 18 harbor boats. American Electric Power Company, Inc. was founded in 1906 and is headquartered in Columbus, Ohio.