Innovation in the field of wireless technologies has revolutionized automation in industrial, commercial and residential sectors. With the proliferation of wireless technologies, it is important to implement an appropriate wireless protocol according to the application area. This paper provides a brief overview of the existing home automation systems and describes ZigBee (over IEEE 802.15.4) technology, along with its comparative study with other protocols. It suggests, ZigBee is an emerging technology in the field of Home Automation system (HAS). It also demonstrates the designing and implementation of HAS for remote controlling and monitoring of various domestic loads/appliances using ZigBee protocol. An efficient method of power utilization through real-time power monitoring with the help of a PC-based GUI application is illustrated.