The 'right' side has of the brain has nothing to do with energy. If one has the energy to use the left side of the brain, then one has the energy to use the right side of the brain.

The brain uses up more calories (energy) than the other organs of the body. Most people do not have the energy to go out, work a full day, then come home and train for an Olympic events.

None of this has anything to do with one's emotions. Emotions are the outcome of thought. I think you should go and read some books on how the neurological brain works.