This is an elaborate paper about steam turbines prepared by Iffco, India. Steam Turbines are one of the main energy consuming equipments, even though not much attention is paid to them. Trimming of operating parameters are essential for efficient operation of these turbines. Illustration given in the paper shows impact of operating conditions on steam turbines. Savings presented are for a typical operating conditions. Huge benefits can be reaped by optimizing operating parameters, by minor modifications and even by replacing old in-efficient turbines.