American Electric Power Company, Inc. (AEP) is a utility holding company that owns, directly or indirectly, all of the outstanding common stock of its public utility subsidiaries and varying percentages of other subsidiaries. The service areas of AEP's public utility subsidiaries cover portions of the states of Arkansas, Indiana, Kentucky, Louisiana, Michigan, Ohio, Oklahoma, Tennessee, Texas, Virginia and West Virginia. The generating and transmission facilities of AEP's public utility subsidiaries are interconnected and their operations are coordinated. Transmission networks are interconnected with distribution facilities in the territories served. On December 31, 2011, Columbus Southern Power Company (CSPCo) merged with and into Ohio Power Company (OPCo) with OPCo being the surviving entity. In March 2012, the Company's subsidiary, AEP Retail Energy acquired BlueStar Energy Holdings Inc. and its independent retail electric supplier BlueStar Energy Solutions.