American Electric Power owns and operates more than 42,000 megawatts of generating capacity in the United States and select international markets and is the largest electricity generator in the U.S. AEP is also one of the largest electric utilities in the United States, with almost 5 million customers linked to AEP's 11-state electricity transmission and distribution grid. The company is based in Columbus, Ohio. States served include Arkansas, Indiana, Kentucky, Louisiana, Michigan, Ohio, Oklahoma, Tennessee, Texas, Virginia, and West Virginia. AEP service territory covers 197,500 square miles with over 38,000 miles of transmission lines and 186,000 miles of distribution lines serving its customers.