The thesis explores the transformation of the Volkswagen Golf 4 into a hybrid electric vehicle through comprehensive modelling and simulation using MATLAB/Simulink. It reviews existing hybrid vehicle technologies and energy management strategies, identifying key areas like energy recuperation, control dynamics, and thermal management. Three configurations are modelled—conventional internal combustion engine (ICE), electric vehicle (EV), and hybrid vehicle—to analyse dynamic performance under various driving conditions. The hybrid model combines an ICE with an electric motor, employing regenerative braking to enhance energy efficiency and reduce emissions. Simulations using standard driving cycles demonstrate the hybrid system's advantages, such as improved fuel economy and environmental impact. The study provides practical insights into retrofitting conventional vehicles for sustainable mobility, addressing challenges in energy management and system integration. It aims to bridge the gap between traditional and electric vehicle technologies, contributing to advancements in green automotive solutions.