San Diego Gas & Electric (SDG&E) said the new East County Substation project has been energized and is now operating as an integral part of SDG&E's electric transmission system.
The entire project includes a new 58-acre substation in the East County community of Jacumba, an upgraded substation in Boulevard and a 14-mile transmission line connecting the two substations.
Construction began on the nearly $435 million project in May 2013 and the 500 kV transmission substation in Jacumba was completed about one year later in June 2014. Construction recently wrapped up on the reconstruction and modernization of the existing Boulevard substation, which was built more than 60 years ago. Both the reconstructed Boulevard substation and new 14-mile 138kV transmission line connecting the two new substations were placed into service last week. The ECO Substation project interconnects with the existing 500kV Southwest Powerlink transmission line, strengthening this part of the transmission system.
Construction required nearly 950,000 work hours. In the process, SDG&E recorded an impressive safety record given the scale of the project, 75 percent lower than the industry's national average for similar construction projects.
SDG&E is a regulated public utility that provides energy service to 3.4 million consumers through 1.4 million electric meters and more than 860,000 natural gas meters in San Diego and southern Orange counties. The utility's area spans 4,100 square miles.