An energy pyramid is a diagram that shows the amount of energy each organism has and how much it loses the higher up in diagram it gets. As an example say the bottom level of the pyramid 100% of the energy is available. The higher up in the pyramid you lose 90% of your energy each time. At the top of the pyramid the amount would be .01%. The reason energy is lost is because the higher up in the pyramid you are the farther away your are form a direct energy source.