SAN DIEGO - A regional water agency approved a contract Thursday to buy the entire output of what would be the Western Hemisphere's largest seawater desalination plant, clearing the way for construction to begin early next year.
The San Diego County Water Authority board backed the 30-year deal with Poseidon Resources LLC, which needed it to sell investors on bonds that will finance more than 80 percent of construction of the $984 million project.
The plant in Carlsbad is designed to produce 50 million gallons of highly purified drinking water a day, enough to supply about 8 percent of the region in 2020.
The agency will pay $2,042 to $2,290 for an acre-foot of water, more than twice what it cost to bring water from Northern California and the Colorado River on hundreds of miles of aqueducts. But backers of the project say the premium is well worth the protection it provides against drought and predict the price differential will diminish over time. The region imports about 80 percent of its water.
"It's absolutely critical to our region's water reliability and economic stability. It's another historic step toward making us less vulnerable to drought and the severe competition for water that we import," said San Diego Mayor Jerry Sanders.
The decision was being closely watched, especially in California, where the plant is the furthest along among about two dozen proposals in various stages of planning.