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But desalination is expensive. A thousand gallons of freshwater from a desalination plant costs the average US consumer $2.50 to $5, Pankratz says, compared to $2 for conventional freshwater.ut desalination is expensive. A thousand gallons of freshwater from a desalination plant costs the average US consumer $2.50 to $5, Pankratz says, compared to $2 for conventional freshwater.
But that dash of independence comes at a cost. The water authority is locked into a 30-year deal with the plant's developer, Poseidon Water, to purchase desalted water for about $2,000 an acre foot in 2012 dollars.