The organelle that produces energy from chemical fuel is the mitochondrion.

Here's why:

* Cellular Respiration: Mitochondria are the sites of cellular respiration, a process that breaks down glucose (a type of sugar) and other fuels in the presence of oxygen to generate ATP (adenosine triphosphate). ATP is the primary energy currency of cells.

* Powerhouse of the Cell: Mitochondria are often referred to as the "powerhouses of the cell" due to their crucial role in energy production.

Let me know if you'd like more information about mitochondria or cellular respiration!