In the energy sector worldwide, everyday comes with new challenges, whether it find renewable energy source or when this energy source can degrade the environment and/or when its efficiency does not satisfy its implementation. In this work, an energy reuse system of cogeneration and/or trigeneration will be covered. In the tests performed, the primary source is an internal combustion engine 100 KVA driven by natural gas and generates electric power by a synchronous generator coupled to the motor shaft. Energy loss by the exhaust gas is recovered in an absorption refrigeration system of 5RT. This first system is restructured to reuse the gases rejected by the generator of the absorption refrigeration system, in order to preheat the fluid oil used in biodiesel plant as a driven source. The unit of high performance generation can be classified as cogeneration and/or trigeneration, depending on the type of arrangement which was tested and will meet the physical facilities, such as: the laboratory of control and Instrumentation in Energy and the Environment, the Mechanical Workshop, the Institute of sustainable energy of the UFPB, and also the building of RECOGAS. In this study, the constituent energy power of each term of the polygeneration system considering the generator engine group as a main driven source and the results shown in a Sankey diagram was evaluated, allowed to check the whole process from the beginning of the burning fuel to end of the electricity production.