What happens during the regeneration stage of the calvin cycle

The 3rd phase of Calvin cycle is the regeneration of carbon dioxide acceptor (RuBP). It is a complex series of reactions, the carbon skeleton of the five molecules of Glyceraldehyde-3-P are rearranged by the last steps of the Calvin cycle into three molecules of RuBP. To accomplish this, the cycle spends three more molecules of ATP. The RuBP is now prepared to receive CO2 again and the cycle continues.

For the net synthesis of one G3P molecule, the Calvin cycle consumes a total of nine molecules of ATP and six molecules of NADPH. The light reaction regenerate the ATP and the NADPH.

The G3P spun off from the Calvin cycle becomes the starting material for metabolic pathways that synthesize other organic compounds, including glucose and other carbohydrates.