Electricity Consumption by the Control System is an important factor in energy efficiency terms. A 400Ampere breaker consumes about 200 units of energy in an year! similarly the 5W indication lamp consumes about 50 units an year. So the ON OFF indication on a panel consumes 100 units an year. A control panel normally contain several indication lamps, coils etc. ( I am not considering the energy consumed by the long control cables). So it is important to address this problem while you design control circuits and control panels. On simple step towards energy efficiency of control panels is by selecting energy efficient components.