There are more energy crisis is occurring in India. We are in a situation to produce own renewable energies. Many industrial and commercial sectors have started producing their own renewable energies. Only if the residential sectors start to produce their own energies, we can overcome the energy crisis. Sewage treatment plant is one of most power consuming source in a residential building. Sewage treatment is the process of removing contaminants from wastewater, primarily from household sewage. It includes physical, chemical, and biological processes to remove these contaminants and produce environmentally safe treated wastewater (or treated effluent). The types and the energy consumption are studied in this paper. Also suitable source of energy is given as a solution to offset the power supply of STP in residential buildings.