While the United States played a crucial role in the invention of photovoltaics, other countries have also made significant contributions to the development of solar energy technology. Japan, for example, has been a pioneer in the solar industry and has made substantial. The first three concentrated solar power (CSP) units of Spain's Solnova Solar Power Station in the foreground, with the PS10 and PS20 solar power towers in the background Solar power, also known as solar electricity, is the conversion of energy from sunlight into electricity, either directly using. Solar power is clean, green, inexpensive, and renewable energy that is produced when sunlight strikes human-made solar cells and is subsequently converted into electricity. With the way the cost of solar has plummeted in the past decade, it's easy to forget that going solar. Swiss scientist Horace de Saussure was credited with building the world's first solar collector, later used by Sir John Herschel to cook food during his South Africa expedition in the 1830s. See the Solar Cooking Archive for more information on The journey from laboratory curiosity to your neighbor's roof involved dozens of innovators.