[pharmacist2030 (OP)]

Is there is a possibility to use the repulsive energy to generate mechanical energy somehow? For instance, if you get two magnets positively or negatively charged they will create a repulsive energy. Can this kind of energy be harnessed to create electricity? We will just make a gap or space between the two magnets with a specific distance to create this magnetic repulsive energy but the question is if this kind of energy will be of any use?

[evan_au]

Is there is a possibility to use the repulsive energy to generate mechanical energy somehow?

Yes, the repulsive force between electrons is used to generate mechanical energy in an electric motor.

And the repulsive force between electrons is used to generate mechanical energy in a turbine. This is often harnessed to create electricity in power stations.

We will just make a gap or space between the two magnets with a specific distance to create this magnetic repulsive energy but the question is if this kind of energy will be of any use?

Unfortunately, the law of conservation of energy means that you won't get any more energy out than you originally put in.

And thermodynamics tells us that you will actually get out less energy out than you originally put in.

So I'm afraid that the eternal dream of a perpetual motion machine that can generate electricity will remain just that - a dream.
See: https://en.wikipedia.org/wiki/History_of_perpetual_motion_machines

[PmbPhy]

Yes, the repulsive force between electrons is used to generate mechanical energy in an electric motor.

It's the combination of the magnetic force and the electric force that generates an electric current.

[Janus]

Is there is a possibility to use the repulsive energy to generate mechanical energy somehow? For instance, if you get two magnets positively or negatively charged they will create a repulsive energy. Can this kind of energy be harnessed to create electricity? We will just make a gap or space between the two magnets with a specific distance to create this magnetic repulsive energy but the question is if this kind of energy will be of any use?

We don't use "charge" for the property of magnets but rather "polarity". "Charge" is a different property associated with particles like electrons and protons.  There is some interaction between these two, but it is not a direct repulsion or attraction.
Opposite charges and magnetic poles attract and do not repel (positive charges attract negative charges, and North poles attract South poles) For repulsion, you need like pole or charges.
Holding two charges or poles a constant distance from each other will not produce any energy. You can only get energy if allow them to move in response to the attraction or repulsion and extract energy from their motion.
Since you will have to expend energy to push them together in the first place, you are just releasing energy you originally stored.
All methods of energy generation involved the conversion of one form of energy into another.  Either directly, or through stored energy.
For example, the turbines of an Hydroelectric power planet convert the kinetic energy of their rotation into electrical energy.
The turbines are rotated by falling water, which gets it kinetic energy from the gravitational potential it loses traveling from a higher elevation to a lower elevation.   The water got to the higher elevation by being evaporated by sunlight and then falling as rain in the higher elevation, so this was a conversion of Solar energy to gravitational potential energy.   Sunlight gets its energy from the energy stored in the bonds that hold the hydrogen nucleus together, which is released by fusion in the core of the Sun.   So the electricity that runs a light bulb went through a long series of energy storages and conversions before it got there.

[RjMaan]

Yes, you are right. One can harness the energy by using the magnets. It is called as magnetic induction, if the coil is rotated in the gap between two opposite poles of magnet. The current produces in that coil.

[PmbPhy]

To be precise, energy is neither attractive not repulsive. Such notions are vector quantities and energy is not a vector. There is only energy associated with conservative forces.