The process of design, construction and operation of sewage treatment plant (STP) requires multi disciplinary approach. Numerous conventional methods are available for design of sewage treatment plants. The process involved in these treatments is either aerobic, anaerobic or combination requiring number of mechanical and electrical items thereby requiring substantial energy. The ever growing need of energy makes the design, operation and maintenance of STP a challenging task. The conventional method of sewage treatment can be made efficient by advanced technologies and intelligent supervision. However, root zone technology developed by National Environmental Engineering Research Institute treats the sewage. It is found from the study carried out on nine STPs at various locations, it uses only 20% of the energy as compared to conventional sewage treatment plants.