Renewable Energies Solar energy is a renewable energy source, which means an endless source of energy, as we cannot run out of solar, opposed to non-renewable energy sources. Alternative Energy An abundant and renewable energy source is also sustainable. Sustainable energy sources meet the needs of the present without compromising the ability of future generations to meet their needs. Abundant The potential of solar energy is huge. The surface of the earth receives 120,000 terawatts of sunlight, 20,000 times more power than what is needed to supply the entire world. Environmentally Friendly Harnessing solar energy does generally not cause pollution, an important step in fighting the climate crisis.