In this study, we propose an efficient design for a portable energy generator using a parallel-plate capacitor. Analytical calculations show that if charge (Q) is kept constant and dielectric subsequently removed from the capacitor, then electrostatic energy increases by a factor of epsilon(r) (permittivity). Initially, a priming charge must be loaded onto the capacitors that are subsequently disconnected from the voltage source. A significant mechanical nonlinear force is needed to remove the dielectric slab. In the proposed configuration, dielectric constitutes the rotor of generator and is located between two pairs of conducting disks, which constitute the stator. The rotor is divided into four dielectric sectors at 60 degrees spacing whereas the stator is divided into six conducting sectors at 30 degrees spacing. In each cycle, two dielectric slabs go inside the capacitor and two other come outside. This specific geometrical arrangement diminishes the extent of mechanical forces and helps to enhance the efficiency of generator significantly. Additionally, this work also relates to generating large amplitude of voltage that can be used as a high voltage source.