Out of the total consumption of industrial and domestic electrical energy, a certain percentage is lost as heat in the controlling elements. Industrial speed controllers and starters for motors, voltage regulators for generators and even a domestic fan regulator are sources of dissipation of unutilized electrical energy. This paper outlines the control strategies for a number of representative power apparatus where the unutilized electrical energy can be saved, conserved and even recovered by the use of power electronic controllers. Some case-studies undertaken by the Department of Applied Physics, University of Calcutta are reported in the paper in support of the arguments. The use of power electronic controllers in some representative cases have resulted in energy savings varying from 10% to 20% of the total energy consumed.