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Can anybody please explain how the auxiliary power demand varies for a typical 500 MW steam plant from start up to full load. If it start with say, 2% of its max capacity as start up power. and they go up to 8% of max capacity at the time of providing full load,in what steps do this auxiliary power demand increase from 2% to 8%? is it continuously vary with load? like if i load my unit say by 50 MW, then 60 MW and so on at each step? will the aux power increase by 8% of 50 MW,then 8% of 60 MW and so on? or is it varying with discrete steps? i know a unit having five coal mills engages each coal mill at some discrete time intervals like at reaching 100 MW, 200 MW, 300 MW loadings and so on up to 500 Mw? i Know feedwater systems (BFP), draught systems, cooling systems, fuel handling and firing systems, and condensate pumps, circulating pumps all demand power, but i want to know how this demand varies with loading of the unit? how this transition occurs?