Short answer no, long answer yes:
Energy comes in many forms, but plants are not one of them. You could however argue that plants contain stored energy. In this case the chemicals in the plant are the source of energy. These get digested by whatever eats them and therefore can be seen as a form of energy.
sunlight
Solar energy is trapped in the form of chemical energy in plants.
A plant releases energy during photosynthesis, in the form of glucose(sugar) (a monosaccharide)
plant cells perform photosynthesis to store energy from the sun in the form of molecules
A green plant has chemical energy stored in the form of glucose through the process of photosynthesis.
chemical energy
Light.
A plant has chemical energy, which is stored in the form of sugars produced through photosynthesis. This energy is used by the plant for growth, reproduction, and other metabolic processes.
Which king are you thinking of?
Yes - plants store energy in the form of starch.
In an energy source, such as a power plant or a battery, energy is converted from one form to another. For example, in a power plant, mechanical energy from a turbine is converted into electrical energy. In a battery, chemical energy is converted into electrical energy.
Chloroplasts are energy organelles found in plant cells and some algae. They are responsible for photosynthesis, a process that converts light energy into chemical energy in the form of glucose.