The type of solar technology that is used on small scale is photovoltaic cells. They are usually used in panels on rooftops, such as the one on this picture:
Other types of solar power plants usually involve technologies requiring larger areas and are too heavy to be placed on most roofs. They usually work by focusing (concentrating) sunlight into a smaller area using troughs, dishes, or panels mounted at an angle to reflect to a single spot, usually on top of a tall tower.
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