PHOTOVOLTAIC EFFICIENCY This chart is produced assuming concentration ratios of 2:1 and the basic cell efficiencies are temperature corrected. Again, it is apparent the energy cost of 72 to 106 mills/KWe HR is beyond the period's competition, but if the projected optimizations are achieved near schedule, large use of photovoltaic electric power production will closely follow. This is also the conclusion of other studies (Ref. 4). A summary of some of the more obvious advantages and disadvantages of large scale Terrestrial Solar Photovoltaic electric power generation over other solar plants are listed below: a. Advantages 1. Direct conversion of solar energy to electrical energy without mechanical parts. 2. No thermal heat rejection required, therefore no pollution potential. 3. Unlike most concentrator systems, solar cells work on diffused as well as direct sunlight, allowing wider use throughout the country. 4. Collectors systems are very scalable and disperse well to the energy users. b. Disadvantages 1. Major advances in manufacturing technology necessary before cells can become competative for large scale electrical power generation. 2. The low efficiencies dictate large land areas required for large amounts of electrical power.
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