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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.
It is possible to run a desalination plant on solar energy alone, but at a much smaller scale. Solar energy is in the form of heat. Photovoltaic cells transfer this heat energy into electrical energy, and this is then transferred into mechanical and heat energy again.he current power consumption for seawater desalination is less than 3 kWh/m3, which is a 90% reduction in energy use over the past 40 years. This is because of improvements in membrane technology and energy recovery systems.