Energy harvesting is a process of scavenging energy from ambient sources and converting it into useful electrical energy. The traditional and most common vibrational energy harvester includes a cantilever beam with piezoelectric patches on it as an active layer. The energy generation is based on the basic principle of linear resonance. The application of linear energy harvesters is well known, and the modelling is well established for the same. The main drawback of using a linear energy harvester is its narrow bandwidth which can be compensated using a nonlinear energy harvester. Non-linearities can be present in the vibrational energy harvester due to geometric or material nonlinearities. Nonlinearity can also be introduced using a stopper close to the free end of the cantilever. The present study highlights the potential of vibro-impact energy harvester through numerical simulations. In the present work, the coupled dynamics of the piezoelectric mechanism and the electrical output are predicted using lumped parameter models. The governing equations are derived using Hamilton’s principle. The single-mode approximation of the response of the system is considered for modelling. This approximation holds well since the tip mass is far greater than the beam’s mass, and the system can be simplified to a single degree of freedom system with lumped mass at the tip of the beam. It is important to take into account the nature of impact while modelling. Modelling of impact force is carried out using piecewise linear functions of elastic terms. The system is simulated numerically to explore the effects of piecewise nonlinearity on the generated power. It is observed that the key parameters that affect the power generated are the contact stiffness and clearance between the beam and stoppers. The results from the study indicate that harvesting energy using a vibro-impacting system can efficiently increase the bandwidth of the excitation frequencies for some particular sets of parameters and configurations. The results of studies reported in this work shall aid in the optimization of harvester parameters for enhanced power generation.