The more sophisticated versions of these techniques will also allow you to do sensitivityanalysis, e. g. if we doubled the priority we gave to cost would it change which car we selected?
The main cost of thermal power plant chiefly is the coal consumption, and the operating cost of ball mill is only the one small part . It is not necessity to do risk and sensitivityanalysis.
Operating cost is the main risk factor to the lenders and sensitivityanalysis can indicate the relationship between cost factors and lenders' benefits.