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