Plants take in sunlight and combine it with carbon dioxide from the air and water and minerals from the ground. The energy of sunlight is stored in the leaves. Some of the sunlight gets stored underground. This stored sunlight is in the form of fossil fuels like coal and petroleum. Solar energy can be stored at high temperatures using molten salts. Off-grid photo-voltaic (PV) systems use rechargeable batteries to store excess electricity generated through PV cells. Pumped-storage hydroelectricity stores energy in the form of water pumped when energy is available from a lower elevation reservoir to a higher elevation one.
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