sentences:  San Diego Gas & Electric has also proposed a new 500 kV power line, with its eastern terminus at the North Gila substation and several possibilities for the western terminus and route configuration.On October 21, 2007 the Harris Fire, part of the California wildfires of October 2007, damaged and disabled an extension of the North Gila-Imperial Valley 500 kV line that heads into San Diego.The 2011 Southwestern United States blackout that began on September 8, was a widespread power outage which affected parts of western Arizona, northern Baja California, and Southern California.