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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.
Aside from the financial cost of desalination, itâs a very energy intensive process. According to this article on LiveScience, current desalination methods consume around 14 kilowatt hours of energy to crank out 1,000 gallons of desalinated water.The typical Australian uses somewhere in the region of 100 gallons a day (about 400 â 500 litres). USA consumption rate is pretty much the same.ccording to this article on LiveScience, current desalination methods consume around 14 kilowatt hours of energy to crank out 1,000 gallons of desalinated water. The typical Australian uses somewhere in the region of 100 gallons a day (about 400 â 500 litres).