ABSTRACT
The energy radiated from the sun is equivalent to a million billion
100 GW power stations. Part of this energy reaches the planet Earth
at a rate of ∼1 kWm−2, but technology has succeeded in tapping only a tiny fraction of this energy to date. The sunlight falling on
Earth consists of ultraviolet (UV), visible, and infrared (IR) (heat)
radiation, and all renewable energy sources (hydro, wind, waves,
biomass, etc.) arise due to the primary solar energy.
