The Public Utilities Commission of Ohio has set a new pricing structure for fees competitors must pay Columbus-based American Electric Power as it transitions to a competitive market. The commission's order sets the fee at nearly 189-dollars per megawatt day, but requires AEP to charge suppliers a lower market-based price. Regulators say AEP can recover the difference, and they expect rule in August on how that would work. The charge is not assessed directly to customers, but businesses could choose to pass along the increase to customers. The decision follows a months-long battle that included dueling television ads between AEP and Akron-based FirstEnergy Solutions over whether the plan is fair.