Intertie refers to the electrical connection between two separate power grids. Synonyms for intertie include tie-line, interconnection, interlink, and grid connection. These terms imply the connection of two or more power sources to make a stronger and more reliable power system. A tie-line is a physical line connecting two power systems. Interconnection is an act of connecting two or more systems. Interlink and grid connection both refer to the physical junction box or panel that is used to connect two or more power systems. In all cases, intertie, tie-line, interconnection, interlink, and grid connection all refer to the physical link between two or more power systems.