From the last stage of the steam turbines, the steam still has a high temperature that must be cooled down. If seawater is used for cooling, it is possible to bring the cooling water to the boil under vacuum in special units. The subsequent condensation produces salt-free fresh water. A 1GW el DESERT-VISION solar power plant produces 5000m 3 fresh water per hour With 8000 operating hours per year, that's a tremendous amount of 40 million m 3 .