NOVELTY - The apparatus comprises: a pressure retarded osmosis system to desalinate sea water (102) and produce a distillate water for human consumption; a power generation system to produce an electricity using a force generated by a diluted brine water (324) from the osmosis system; a turbine to depressurize the brine water to send a generator to generate the electricity to feed a network using a pressured diluted brine produced by the osmosis system; and a splitter (330) to send one stream of distillate water from membrane distillation system to osmosis system.    USE - The apparatus is useful for producing electricity using pressure retarded osmosis during desalination of sea water.    ADVANTAGE - The apparatus ensures efficient, economical, rapid and safe production of the electricity with low energy consumption.    DETAILED DESCRIPTION - The apparatus comprises: a pressure retarded osmosis system to desalinate sea water (102) and produce a distillate water for human consumption; a power generation system to produce an electricity using a force generated by a diluted brine water (324) from the osmosis system; a turbine to depressurize the brine water to send a generator to generate the electricity to feed a network using a pressured diluted brine produced by the osmosis system; a splitter (330) to send one stream of distillate water from membrane distillation system to osmosis system and the second stream of distillate water to the separate container; a heat exchanger (304) to harness a retentate stream temperature and maintain the heat in the distillate water that is desalinated; a suction fan to collect an evaporated water for the aeration system and/or the filtration unit and sending it for further processing the heat exchanger and/or membrane units in parallel; a membrane distillation unit comprising the membrane units in parallel, having a hydrophobic membrane to filter a heated water, the evaporated water and/or a rejected water and produce distillate water for consumption; and a vacuum pump (308) to collect a water vapor from a permeate side of the membrane distillation unit and send it to the heat exchanger and/or a distillate water collection tank. An INDEPENDENT CLAIM is included for a process of producing electricity.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a method of generating electricity using pressure retarded osmosis during desalination of sea water.    Sea water (102)    Heat exchanger (304)    Diluted brine water (324)    Vacuum pump (308)    Splitter. (330)