Renewable energy is commonly characterized as energy that originates from assets which are normally recharged on a human timescale, for example, sunlight, wind, rain, tides, waves, and geothermal heat. Renewable vitality replaces customary powers in four distinct territories: electricity generation, air and water warming/cooling, motor fuels, and rural (off-framework) energy administration. Sun based power is a type of energy bridled from the power and warmth of the sun's beams. It is renewable, and in this way a "green" source of energy. In this paper we take a review of renewable energy system and solar energy system.