Energy can be found everywhere and in many forms. In the same way as the existence of matter, energy as existed since the dawn of the Universe. It is a constant quantity in the Universe: nothing gets lost, but only transformed.
Energy is the ability to do work and mass and energy are the same thing. Remember E=mc^2? Energy can never be created, but only transferred. Also, it seems that we are 98% energy. Veritasium created a great video about mass that really needs to be watched: if mass is energy, it means that the trees are full of energy?