Throughout the human history, a series of technologies introduced for water treatment and power optimization can be traced. The growing population demands electricity, this is increasing pressure on our non-renewable resources which are depleting fast. Therefore, salinity gradient energy is a promising renewable energy source for the future. The increasing scarcity of drinking water has also wretched human life quality. The paper proposes the use of graphene membrane for power generation using reverse osmosis process. At the same time water is desalinized and processed for purification so that there is availability of ultra-pure clean water without using filters in there households and abundant electricity without any ecological imbalance. The proposal includes removal of arsenic, poorly biodegradable pollutants using TiO₂ nanoparticles. Electrolysis is used to obtain chlorine. Advance electronics implementation also renders this with pump control, fouling detection modules and decision module for the volume of effluent to be discharged. The idea focuses on increasing water supplies through the safe re-use of wastewater and efficient desalination of sea water and to fulfil large demand of electricity in the world renewably.