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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.
S OLAR D ESALINATION 323 The same procedure will be used to estimate the levelized water cost (LWC). Addi-tional data to calculate the cost of the desalination plant:1. Investment cost of RO facility: 850 e/m 3 day installed (availability: 92%).2.