Abstract: The present invention provides a gravity based energy conversion system. The gravity based energy conversion system includes a circular pulley, a first container, a second container, a rotational energy conversion unit, and an electric energy generation unit. The first container and the second container are suspended on either sides of the circular member using a connecting member. According to the present invention, weight of the first container and the second container is altered to obtain continuous ascending and descending movements of the first container and the second container. The ascending and descending movements of the first container and the second container generates a bi-directional circular motion at the circular member. The rotational energy conversion unit converts the bi-directional circular motion of the circular member into a unidirectional rotational movement.