Question

If energy can neither be created nor be destroyed then how does it came into existence?

Answer 1

It does not come into existence but it is transformed into different forms such as Kinetic energy , potential energy , heat energy etc.

It is already on earth in stored form.

Origin of energy is still a question.

Hope it helps!

Answer 2

     Energy on EArth and in the Universe existed already as mass, kinetic energy and rotational energy of various bodies like Planets.  Radiation from stars such as Sun and others is light and electromagnetic energy.  A mass m is equal to energy m c² as Einstein formulated.

   Energy also existed like gravitational energy. In substances there is chemical energy. That is released when some reactions take place.  Radiation resulted in magnetic energy also.

   All this is possible through a big bang at one time or through cosmic dust being scattered.. Perhaps God who is the ultimate form of energy, created it.

   Thus already inherent and existing energy forms have transformed from one form to another and have converted materials into some other materials.

   Energy cannot be created or destroyed in the present world. But in the beginning itself, energy was already existing.  HOW ?  It is a question that philosophers are searching for thousands of years.