Light Reactions and the Calvin Cycle The electromagnetic energy of sunlight is converted to chemical energy in the chlorophyll-containing cells of photosynthetic organisms. In eukaryotic cells these reactions occur in the organelle known as the chloroplast. Also, how is solar energy converted into chemical energy? Photosynthesis in plants converts solar energy into chemical energy using electrons and protons from water. In the energy -transduction reactions, solar energy is converted into chemical energy in the form of two energy -transporting molecules, ATP and NADPH. Secondly, where is chemical energy stored in plants? Most of this energy is stored in compounds called carbohydrates. The plants convert a tiny amount of the light they receive into food energy . When animals eat green plants (2) they consume and absorb some of this energy , which stored as chemical energy in compounds known as fats and protein. Subsequently, question is, how do plants convert sunli...