The increasing fuel prices and global warming concerns have made reducing greenhouse gas emissions and improving efficiency in industrial operations difficult. To address this, researchers have been focusing on waste heat recovery systems. By harnessing the energy produced during industrial processes, these systems offer potential benefits such as energy savings, reduced emissions, and enhanced sustainability. The recovered waste heat can be utilized for generating electricity or pre-heating combustion air and hot water feeds, resulting in cost-effective enhancements in energy efficiency and equipment productivity. The main objective of this project is to simulate and optimize the recovery of energy from waste exhaust gases generated by heat engines, using various technologies like Thermo Electric Generators, hot oil, steam generation, and Organic Rankine Cycle. The study was initiated with a thorough review of existing literature, followed by modeling using ASPEN HYSYS V11 to enhance the overall performance of the processes. Its aim to compare these technologies to determine which one can effectively reduce fuel consumption and increase annual savings.