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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.
The largest desalination plant in South Asia is the Minjur Desalination Plant near Chennai in India, which produces 36.5 million cubic meters of water per year. A second plant at Nemmeli, Chennai is expected to reach full capacity of 100 million litres of sea-water per day in March 2013.ater there and at Queensland's Gold Coast Desalination Plant and Sydney's Kurnell Desalination Plant is withdrawn at only 0.1 m/s (0.33 ft/s), which is slow enough to let fish escape. The plant provides nearly 140,000 m 3 (4,900,000 cu ft) of clean water per day.