Abstract: Fuel cells have proven to have the potential to re-establish how things are powered on our planet, from small- to large-scale. They are a gateway to clean, reliable, and optimal energy generation. Studies and their applications have showed that they diminish usage of polluting fuels significantly, in turn helping the world shift from traditional fossil fuels to cleaner alternatives. Pressure control of reactants in fuel cells is an ongoing research. Mathematical modeling of Proton Exchange Membrane Fuel cell (PEMFC) using MATLAB/Simulink is carried out in this study for investigating the performance of PEMFC with the static and dynamic load. The mechanism for controlling reactant pressure within the fuel cell is a simple PI controller. The behaviour of PEMFC with PI controller in static and dynamic DC loading conditions is illustrated. The study concludes that simple PI controller works well with in these conditions.