There's a great article online in the Huffington Post about how desalination is not the answer for those of us responsible for water management planning. The author, Peter Hanlon, makes a great point about how much energy is used. In the case of San Diego, we'll use a lot more energy than our current practice which is to pump it out of the ground, and transport it thousands of miles for our use. Desalination means an increase in our water bills AND our electric bills.
"The process of converting salt water to drinking water is highly energy-intensive. In San Diego it takes eight times more electricity to produce about 325,000 gallons of water through desalination than it takes to pump the same amount of groundwater. Because desalinated water is so energy-dependent, water customers are vulnerable to rises in energy costs.