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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.
That desalinated water, however, won't be cheap. When you want to desalinate, it's incredibly energy-intensive, and therefore cost-intensive, said Michael Webber, deputy director of the Energy Institute at the University of Texas at Austin. And that's the rub of it. It's drought-resistant, it's abundant, it's never going to go away, but it's costly to do.. There are two main desalination processes. Thermal, as the name implies, involves heating salt water and then distilling pure, drinkable water from the steam. And there's reverse osmosis, the process Carlsbad will use -- where sea water or brackish water is forced through filter membranes that remove the salts.