Solar energy - Ecology:

The Sun offers a clean and inexhaustible energy to us. The solar energy allows to obtain heat (by thermal collectors) and electricity (using photovoltaic modules). This is a real alternative to other polluting or expensive energies. We calculates that Spain, America Central and South America spend 1500 KW of energy per hour in each square meter.

There is not policy of global solar energy developed yet. The investigation of the technique is vital not only to catch and to transform the energy but also to accumulate it in the summer and to use the reserve (in winter). In addition, has to be profitable, something that will force to look for systems to transport it, since to produce benefits it will have to be accessible to everybody.

To these disadvantages is necessary to add the high price of the solar cells.

The applications of the solar energy are very diverse: from cooling systems based on a hot source to agricultural applications, desalination plants of water, space satellites or the possibility of injecting the electricity generated to a communications network.

The photovoltaic solar panel have, since we have seen, a yield around 15 % and they do not produce heat that can be to reuse - although there are lines of investigation on hybrid panels who allow to generate electrical and thermal energy simultaneously. They are very appropriate for simple facilities in roofs and of self-supplying - projects of rural electrification in zones that do not count. Although its price is still high.

In order to stimulate the development of the technology the price of obtaining of the photovoltaic solar energy, exist prime to the production, that guarantee a fixed price of purchase. In the case of Germany, Italy or Spain.