Koeppel will continue with AEP as an executive vice president through the fourth quarter for financial reporting continuity and to assist Tierney during the transition.
Tierney previously served as executive vice president of the firm's AEP Utilities East division, responsible for the distribution, customer service, and financial performance of AEP's utility operating companies in the states of Indiana, Kentucky, Michigan, Ohio, Tennessee, Virginia, and West Virginia.
Venita McCellon-Allen will replace Tierney as executive vice president of AEP Utilities East. She previously served as executive vice president of AEP Utilities West, responsible for distribution and customer service operations in the states of Arkansas, Louisiana, Oklahoma and Texas.
Columbus, Ohio-based American Electric Power is an electric utility serving more than five million customers in 11 states.