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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.
Given the high costs of freshwater importation and reclamation, desalinating seawater is an increasingly attractive option for water-stressed areas. The potential for desalination is limited mostly by social, political, environmental and economic considerations, which vary from place to place.nergy consumption accounts for as much as one-third of the total cost of desalinated water, making even coastal plants expensive to operate [source: Maloni, NRC-WSTB ].