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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.
Re-ported cost numbers for PVED systems range between $5.80 per m 3 and $16.00 per m 3 .These prices are high when compared to large-scale desalination plants, but with decreasesin the costs of PV materials and improvements in system technologies, these systems areexpected to become more ï¬nancially viable.