What provides the energy for chlorophyll to manufacture food?

The energy is the light shining on the chloroplast.

Light is a form of energy, and the special contribution of the chlorophylls to ecosystems is that they are able to convert light, which cannot be stored, into chemical energy, which can be stored. This chemical energy drives the synthesis of carbohydrates, which are energy-rich organic compounds, from the inorganic compounds carbon dioxide and water.