Environmental degradation is a global problem that leads to loss of biodiversity, destruction of natural habitats and increased air and water pollution. The unsustainable use of natural resources, industrial pollution and deforestation are some of the main factors contributing to this decline. Renewable fuels are sustainable and environmentally friendly energy sources. This includes solar, wind, hydro and biomass energy. These resources provide viable alternatives to fossil fuels, reduce greenhouse gas emissions, and reduce dependence on non-renewable resources. Green hydrogen is a form of renewable energy produced by the electrolysis of water using electricity from renewable sources. It is a promising alternative to fossil fuels that contributes to the reduction of greenhouse gas emissions and to the transition to a cleaner and more sustainable economy. The objective of this work is to carry out a thermodynamic modeling of the production and storage of hydrogen in fuel cells and through the thermodynamic results it proves the effectiveness of 6 cases involving 3 ethanol reforming routes (Steam Reforming, Partial Oxidation and Auto Thermal Reforming) and 2 types of fuel cells (PEMFC and SOFC), thus generating different results and during the conclusion, define: the heat involved in the production of hydrogen and charging of the fuel cells, the electrical power that the CaC will reach in different parameters (temperature , oxygen and steam rate) and thus judge the best case according to the results obtained. By modeling the thermodynamic equilibrium by minimizing the Gibbs free energy using a routine developed in MATLAB software, it is possible to find the compositions of the ethanol reforming products and from that calculate the efficiency and energy demand in the three ethanol reforming routes. ethanol. The conclusion was based on heat calculations and the criteria for choosing the best case were hydrogen production yield, reaction spontaneity, lower emission rate of polluting gases (such as carbon monoxide) and low energy/heat demands. . It is concluded that the optimal conditions for reforming ethanol are through steam reforming at temperatures between 900K and 1100 K with a ratio of steam to ethanol greater than 6 (the higher the better).