The Calvin cycle uses adenosine triphosphate , or ATP, as energy and consumes NADPH2 as a reducing power in the production of sugar in a plant cell. The Calvin cycle takes place in the stroma of the chloroplast. ATP and NADPH2 are part of phase two of the Calvin cycle.
The Calvin cycle is a three phase process in which carbon dioxide is converted into sugar that can be used as energy. The three phases in this cycle are carbon fixation, reduction and regeneration. During reduction, ATP and NADPH2 convert the 3-phosphoglycerate from phase one into glyceraldehyde 3-phosphate (G3P), which is then converted into glucose and other sugars during phase three. For every G3P that is synthesized, the Calvin cycle uses six molecules of NADPH2 and nine molecules of ATP.