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A: Cells use energy in order to grow, regulate metabolism and reproduce. This energy is obtained from a source such as food molecules or light from the sun, and through processes like glycolysis, the citric acid cycle and oxidative phosphorylation, an energy-rich molecule is then created.
Quick Answer. Energy-producing organelles are called mitochondria. Animal cells normally have 1000 to 2000 mitochondria. Cells with higher energy needs, such as fat and muscle cells, have more. Mitochondria are capsule-shaped organelles measuring between 1 and 10 micrometers in length. Mitochondria are made up of two membranes.