Solar Energy: An Infinite Source of Clean Energy

Abundance, cleanliness and widespread distri bution are great incentives for the application of solar energy to man's energy requirements. Recent and impend ing fuel shortages, cost increases of energy and environ mental degradation have provided strong incentives for the development of solar energy for wide practical use. However, its low intensity and high variability impose severe econo mic problems in converting it to useful forms. Conversion of solar radiation to thermal, electrical and mechanical energy has been well demonstrated in numerous experi mental systems. Of these methods, those of greatest current interest are the production of heat for the heating and cooling of buildings and the direct, or indirect, conversion to elec tricity. In favorable locations, the costs of solar heating and cooling equipment under development appear to be nearly competitive with fuels; hence, this application is ex pected to be widespread within a very few years. Electric power from solar energy is not now competitive with conventional supply and is, therefore, a longer term possibility.