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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 high cost of traditional desalination is driven by the price of energy for high-pressure systems and the capital cost of high-pressure pumps and seals. Today, recovery of capital and electric power add up to as much as 73% of the cost of desalinated water.resh water scarcity and cost-effective desalination. The scarcity of fresh water is an increasingly serious problem around the world due to growing populations and diminishing supplies of fresh water. Desalination could help alleviate these shortages, but it has traditionally been an extremely expensive process.