Final answer:
The energy required to run the Calvin cycle is produced in the light-dependent reactions of photosynthesis.
Step-by-step explanation:
The energy required to run the Calvin cycle in photosynthesis is produced in the light-dependent reactions. During these reactions, energy is captured from sunlight and converted into chemical energy in the form of ATP and NADPH. These energy-rich molecules are then used in the Calvin cycle to power the conversion of carbon dioxide into glucose.