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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.
Artist's impression of the Wonthaggi Desalination Plant site. Viewing platform of the desalination plant as depicted by the artist. The Wonthaggi plant construction was started in September 2009. The desalination project is estimated to cost $3.5bn.