Solar Energy is radiant light and heat from the sun .It is an important source of renewable energy Active solar techniques include the use of photovoltaic systems, concentrated solar power and solar water heating to use the energy. Directly using photovoltaic (PV), or indirectly using concentrated solar power (CSP).
Concentrated solar power systems use lenses or mirrors and tracking systems to focus a large area of sunlight into a small beam. Photovoltaic convert light into electric current using the photovoltaic effect. Sunlight provides by far the largest of all carbon-neutral energy sources. More energy from sunlight strikes the Earth in one hour (4.3 × 1020 J) than all the energy consumed on the planet in a year (4.1 × 1020 J).