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Waste heat recovery system plays a pivotal role for heat extractions in every energy consuming sector. Thermo-Electric Module converts this waste heat into useful work done as “electric energy”. Electric energy thus produced possesses many promissory benefits, such as:(a) energy storage in DC batteries,(b) running various loads in residential, commercial and industrial sector,(c) exporting power to grid, thus earning valuable revenues,(d) maintain economic growth of plant, and (e) environment friendly system. Recently, among various renewable energy technologies, Waste Heat Recovery (WHR) is paid much consideration in commercial, residential, and industrial sectors. In past decade, a number of WHR technologies are developed and improved. In this paper, relevant research works are reviewed regarding existing technologies of WHR. Thermoelectric Generator (TEG) is one of extensively emerging WHR …