No problem. You probably know a whole lot more about this stuff than I do. I was just trying to make the point that spent steam from power generating turbines might very well be hot enough to use for distillation either as the sole heat source or at least to provide a good part of the heat energy required. I don't know how practical that would be, but it may be possible.
For power plants, the maximun theroretical Carnot cycle efficiency is determined by:
1 - Tr / Ta
Where Tr is the temperature at rejection and Ta is the temperature of the source, about 560 degrees for our plant. That is why we take the Tr down as low as possible, less than 100 degrees F. If we took it down to only 200 degrees F we would lose efficiency and generate less electricity as a result. Note that the power plant actually works on the Rankine cycle which is limited in efficiency by the theoretical Carnot cycle.