The organelle in a plant that uses energy from sunlight to make sugar is the chloroplast.

Here's a bit more detail:

* Chloroplasts are the sites of photosynthesis. They contain a green pigment called chlorophyll which absorbs light energy.

* This light energy is used to convert carbon dioxide and water into glucose (sugar) and oxygen. This process is called photosynthesis.

* The glucose produced is used by the plant for growth and other processes, while the oxygen is released into the atmosphere.