Flexi Says: People cannot make energy in a literal sense, because energy cannot be created or destroyed. In science, this principle is called the conservation of energy. However, energy can change from one form to another. People use these changes to obtain energy in useful forms. For example, a solar panel can change light energy to electrical energy. Lightbulbs change electrical energy to light energy. Your body can change chemical energy from food to kinetic energy as you use your muscles to move from place to place. A nuclear power plant can even convert some matter in radioactive elements into thermal and electrical energy. In all cases, people must get energy from a source.