The Lake Hodges Pumped Storage Project is a pumped storage operation in the hills east of Encinitas, in northern San Diego County. Though it is small in output, producing only 40 megawatts at its peak, it is the most recently constructed pumped storage project in the nation, going online in 2012, and the only one constructed since 1995. The lower reservoir is Lake Hodges, a dammed portion of the San Dieguito River, completed in 1918. The upper reservoir is the Olivenhain Reservoir, which was completed in 2003, as part of San Diego county’s Emergency and Carryover Storage Project. The reservoir is fed by imported water from the Second San Diego Aqueduct, coming from the north. An underground pipeline, ten feet wide and a mile long, was completed in 2008, connecting the Olivenhain Reservoir to Lake Hodges, and a few years later the small pumping/generating station on the shore of Lake Hodges went online, capable of pumping water back uphill to the Olivenhain Reservoir. Like some other pumped storage projects in California, and along rivers around the USA, it exists more for water supply management than for electrical generation.