American Electric Power Co., Inc. is a public utility holding company that engages in the business of generation, transmission and distribution of electricity. The company is headquartered in Columbus, Ohio and currently employs 17,582 full-time employees. The service areas of the Company's public utility subsidiaries cover the states of Arkansas, Indiana, Kentucky, Louisiana, Michigan, Ohio, Oklahoma, Tennessee, Texas, Virginia and West Virginia. The firm's segments include Vertically Integrated Utilities, Transmission and Distribution Utilities, AEP Transmission Holdco, and Generation & Marketing. AEP's vertically integrated utility operations are engaged in the generation, transmission and distribution of electricity for sale to retail and wholesale customers. Transmission and Distribution Utilities segment consists of the transmission and distribution of electricity for sale to retail and wholesale customers. AEP Transmission Holdco develops, constructs and operates transmission facilities.