if that is the case, what do you call the hardware side of this topic. is it power system?? salamat po!
i am not quite sure if we are on the same page on this, but the power management system i am talking of is the same as the energy management system, so i can't directly answer your question about hardware.
power system is a MUST for this system. you need to understand the load profile of the "electrical system" where you will apply this management system, like what time energy consumption is highest and lowest, what equipment are operating at these times, and other relevant information that you will need in devising the energy conservation program.