AEP - Indiana Michigan Power Co., an energy company with a balanced portfolio of energy assets, owns and operates more than 43,000 megawatts of generating capacity in the United States and selected international markets and is the largest electricity generator in the U.S. AEP is a leading wholesale marketer of energy commodities, utilizing its energy expertise and risk management skills to make optimal use of its generation, natural gas pipeline systems, natural gas storage, coal mines and inland barge fleet. 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.