Thermogenesis. Thermogenesis is the process of heat production in organisms. It occurs mostly in warm-blooded animals, but a few species of thermogenic plants exist, such as the Eastern skunk cabbage and the Voodoo lily.hermogenesis is the process of heat production in organisms. It occurs mostly in warm-blooded animals, but a few species of thermogenic plants exist, such as the Eastern skunk cabbage and the Voodoo lily.