Which form of energy does a plant store when light is transformed during photosynthesis?

It’s chemical energy

Photosynthesis is the process plants and some algae use to convert light energy to chemical energy stored as sugar. Plants need only carbon dioxide (CO2) and water (H2O) for photosynthesis to work. This occurs in plant leaves, specifically the leaf cells' chloroplasts. Chloroplasts are full of chlorophyll, a green pigment key to photosynthesis. The energy stored during photosynthesis starts the flow of energy and carbon down the food chain. All the energy we consume through food is a direct or indirect result of the energy stored by photosynthesis.