sentences:  This power line, maintained by San Diego Gas & Electric (SDG&E), begins in the Imperial Valley substation located west of Mexicali between the Mexico–United States border to the south and Interstate 8 to the north.The same substation is also the northern end of Path 45, an international power transmission corridor linking the Californian power grid to the Mexican power grid.Leaving the substation, the line parallels Interstate 8 at a distance to the south as both Interstate and power line head east.