Solar Power Energy for Today Age Group: Grade 3 (Hi/Lo) Description Solar Power: The Sun is our greatest source of energy. Without its light and heat, life on Earth would not exist. For centuries, people have used the Sun’s energy to heat their homes and cook meals. Today, we use the Sun’s power, called solar power, to make electricity. Learn about the different ways we convert the Sun’s energy to electricity and the exciting plans for solar power in the future.