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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.
(1 cubic meter is about 264 gallons.) However, more than half of the total cost of desalination comes directly from energy cost, and since energy price is very volatile, any calculated cost of desalination is only good based on the energy price at the time of calculation.actors that determine the costs for desalination include capacity and type of facility, location, feed water, labor, energy, financing, and concentrate disposal. Desalination stills now control pressure, temperature, and brine concentrations to optimize efficiency.