Now I'm trying to give an answer of the question. Satellite rotates about earth by the gravitational force of earth. Now if we place the satellite in such an orbit so that it rotate in opposite to earth rotation and having a greater angular rotational speed.
Now there is an existence of earth magnetic field. Though it is very poor but strength of magnetic field is not the major factor of energy conversion. So as in electrical machine rotor rotates and stator gives magnetic field and electricity generates is it not possible to extract gravitational energy by using satellite as rotor and geomagnetic field as stator? how much it is effective?
Edited: OK eventually this question becomes duplicate. Now I am asking how can we store this energy. Can we store this energy? or not.
