Understanding desalination

When Manorama reports something, it is expected to be spicy and that is why we read "Creating History" more often. The Hindu says its 44km off the cost. So is Manorama just below the picture, but could not resist adding another 4km while reporting. While the cost of the water produced at 3-4 Paise/L is acceptable Rs 5/L is highly unrealistic. Why worry about drawing water from 500m deep while surface water is available? answer: the deep cold water is used for condensing the water vapour generated from the warm water (presently surface water and the plan is to use water from thermal power plant)