The organelle present in great amounts in cells that use a lot of energy is the mitochondrion.

Here's why:

* Energy Production: Mitochondria are the powerhouses of the cell. They are responsible for cellular respiration, the process that converts glucose into ATP (adenosine triphosphate), the primary energy currency of the cell.

* High Energy Demand: Cells that require large amounts of energy, such as muscle cells, nerve cells, and cells in the liver, have a high density of mitochondria to meet their energy demands.

So, the more energy a cell needs to function, the more mitochondria it will have!