In basic estimation of energy savings, a unit is being compared with other units belonging to the same sector. For example, a foundry unit is compared with other foundry units irrespective of the process it follows (here it may be induction furnace or cupola furnace), product material type (here CI castings or SG castings), final product (here valves, gears, engine housing etc.) and whether it is finished or unfinished product. But in advanced estimation of energy savings, the user may select the processes it follows (sub-sectors), product material types, final product etc., however the analysis will be done considering the selected majors of the aforesaid particular. Therefore, the advanced estimation of energy savings facilitates more realistic comparison and the gap in energy consumption.