The sun creates its energy through a thermonuclear process, which creates heat and electromagnetic radiation. Only small fraction of the total radiation produced reaches the Earth. Insolation is a measure of solar radiation energy received on a given surface area in a given time, and is expressed as average irradiance in watts per square meter or kilowatt-hours per square meter per day. Solar Energy is then refers primarily to the use of this solar radiation for practical ends. Solar insolation of the Inida is well expressed in the map as figured right.
The sun is one of the most promising sources of power for replacing fossil energies. Solar power is abundant, inexhaustible and free and is more predictable than wind energy. Thus, solar power is destined to be one of the technological options that will contribute massively to covering worldwide energy demand with high environmental "profitability".
The energy value of solar radiation can be leveraged directly or converted into other forms of useful power by means of solar technologies. Solar power presents a broad number of technological options with developments that must be promoted.
In this way, the technological evolution of solar power and the increasing cost of fossil fuels will permit competitive medium-to-long-term solutions in renewable forms of energy.
Light energy captured from the Sun-or photovoltaic energy-provides a ready source of non-polluting electricity. It's predictable, scalable, and renewable. Using Solar Solutions in remote areas outside electric-utility grids is more than convenient-it's almost a necessity. That's right; You can get clean energy for the same, or less than, the electricity you get now from fossil-fuel-burning power plants.