Electric Potential Energy is the amount of work needed to move a unit charge from a reference point (e.g., Earth) to a specific point against an electric field.
Reference Definition by Wikipedia: Electric Potential Energy, or electrostatic potential energy, is a potential energy (measured in joules) that results from conservative Coulomb forces and is associated with the configuration of a particular set of point charges within a defined system. An object may have electric potential energy by virtue of two key elements: its own electric charge and its relative position to other electrically charged objects.
Related Definitions in the Project: The Electrical Engineering; Energy Definitions