American Electric Power is a major investor-owner electric utility

Public utility

A public utility is an organization that maintains the infrastructure for a public service . Public utilities are subject to forms of public control and regulation ranging from local community-based groups to state-wide government monopolies...

 in various parts of the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. AEP ranks among the nation's largest generators of electricity, owning nearly 38,000 megawatts of generating capacity in the U.S. AEP also owns the nation's largest electricity transmission system, a nearly 39000 miles (62,764.3 km) network that includes 765 kilovolt ultra-high voltage transmission lines; more than all other U.S.