There is a cost for the energy plant and the energy, but there is an abundance of saltwater. When one drills for oil/natural gas, the oil companies have to deal with saltwater.
Just boil it (using de-salination process), and one has fresh water...
That is my tangent - start producing fresh water in dry areas using de-salination plants...
Help me out here. Don't we have de-salination plants aboard nuclear vessels that use salt water for cooling?
I don't know what a de-salination plant costs to build, but if they can use salt water for cooling and capture the steam, viola! Fresh water as a by-product of "capturing" nuclear energy.
I'm sure I have over-simplified it.