This presentation discusses using relativistic particles as an energy source based on the variable speed of light theory. It provides theoretical proofs that show as the speed of light slowly decreases over time, the inherent energy of relativistic particles makes them act as an energy source without decreasing their mass. The presentation determines the optimum speed of the particle for maximum power transfer both theoretically by taking the derivative of the power equation and through simulations. It concludes that variable speed of light theory could potentially solve the global energy crisis, though more research is still needed on practical applications.