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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.
The Costs and Benefits of Desalination 167 140% 120% 3 Relative Annual Cost per m 100% 80% 60% 2-Stage Seawater RO with Conventional Pretreatment 40% 20% 0% -30 -20 -10 0 10 20 30 40 50 60 % Change in Baseline Operating Pressure FIGURE 6-9.he Costs and Benefits of Desalination 169 technologies as illustrated in Table 6-2. Such costs are very significant, each representing over one-third of annual cost for a 189,000 m3/day seawater RO facility (Figure 6-6).