In these power stations the sunlight is converted directly into electric current. In the solar cells photons of a semiconductor are absorbed, which entails the production of an electrical charge carrier. Developed DC voltage is transformed with the help of an inverter into three-phase alternating current. The photovoltaic will play in 10 to 30 years the main role in the power production, there it alone in the position be world requirements at current will cover. Solar consumption in the USA is in the comparison with the entire current consumption disappears small because a solar power station takes a large surface up (but the people could install problem-free solar-cells on the roofs and get sufficient current). In Switzerland for example annually only 6 million kilowatt-hours current are produced by means of photovoltaic this is sufficient to supply approximately 1200 households. That corresponds to about 0,01% Swiss population. In the future man would like to use the solar power still better as daily 15000 times more solar power meets the earth than the population needs.
Also the ecological factor plays a large role. An American delivers 19.6 tons carbon dioxide into the atmosphere per year a Chinese however only 2.5 tons.
At present the production of a solar cell is still very expensive as only a small number of this item is produced. If man produces in the large framework, the prices fall under the today's energy production costs. Some people fear that the production of solar cells loads the environment. This fear is unfounded because a kilogram of silicon can be made in the same amount of kilowatt-hours as a kilogram uranium.
Contrary to fossil and nuclear energy, the solar power does not need a special infrastructure to feed the current into the electricity network. The fuel does not have to be transported to the power station and the link of the photovoltaic can be made by the annex.