From the Wall Street Journal:
...Opened in late 2006, Perth's $360 million desalination plant sucks in roughly 50,000 gallons of the Indian Ocean every minute. It then runs that water through special filters that separate out the salt, yielding some 25,000 gallons of drinkable water -- enough to meet nearly a fifth of Perth's current demand.
For decades, critics dismissed desalination as a costly boondoggle that burns colossal amounts of energy, including dirty fuels like coal. Technologically complex, it's also far more expensive than tapping other water sources. The few major desalination plants that did make it to fruition went up mainly in the Middle East, which had energy -- and money -- to burn....MUCH MORE