American Electric Power Co., Inc. is a public utility holding company that engages in the business of generation, transmission and distribution of electricity. It operates through the following segments: Vertically Integrated Utilities, Transmission & Distribution Utilities, AEP Transmission Holdco and Generation & Marketing. The Vertically Integrated Utilities segment engages in the generation, transmission and distribution of electricity for sale to retail and wholesale customers through assets owned and operated by its subsidiaries. The Transmission & Distribution Utilities segment engages in the business of transmission and distribution of electricity for sale to retail and wholesale customers through assets owned and operated by its subsidiaries. The AEP Transmission Holdco segment engages in the development, construction and operation of transmission facilities through investments in its wholly-owned transmission subsidiaries and joint ventures. The Generation & Marketing segment engages in non-regulated generation and marketing, risk management, and retail activities. The company was founded on December 20, 1906 and is headquartered in Columbus, OH.