An electrical energy supply system for a vehicle includes at least one ground conductor configured as a flat conductor rail arranged on a floor assembly of a body in white of the vehicle. At least one supply line inserted into the body in white is included and the at least one supply line is guided, at least one section of the body in white, parallel to and along the at least one ground conductor such that the at least one supply line at least partially overlaps a flat side of the at least one ground conductor. The body in white is made from a metallic material, the at least one supply line is positioned a predetermined distance from the at least one ground conductor, and the predetermined distance is a function of an electromagnetic field resulting from a current flowing through the at least one supply line.