The term 'SOURCE OF SOLAR POWER' can be summed up by the three letter word 'SUN'. The SUN is a natural source of energy that has been used for centuries to provide heat and light. It is the primary source of energy for life on Earth, and it is also the main source of energy for solar power. Solar power is a renewable energy source that uses the SUN's energy to generate electricity. Solar power is becoming increasingly popular as an alternative to traditional sources of energy, such as fossil fuels.