Solar energy is known as the photovoltaic process, radiation from the sun is converted into electricity. Although understood by scientists for many years, this process did not receive attention until the 1950s, when the first silicon solar cell was invented. Since the energy crises of the 1970s, there has been an increasing demand for solar energy technicians. These technicians install, maintain, operate, and test equipment and energy systems that use solar energy. Each solar energy project, from conception to installation, requires the services of many technicians with various skills.