Solar energy, costs and diffusion

Among all the renewable energy sources, the solar one, represents the richest dish, offers an infinite amount of power and is the ideal solution for the planet's energy crisis. Its sustainability should not be underestimated, in fact solar energy is not polluting unlike conventional sources such as coal or natural gas.

However, despite all its virtues, thesolar power it is not cheap at all; this is why many countries do not invest in solar. Wind energy is much cheaper even if it is more difficult to manage, which is why if the market does not change, the race for renewables will increasingly see the wind and less the sun.

Production costs are high and theenergy output product has a poor ratio: it takes about $ 9,000 to produce each kilowatt of power. A large investment that will only bear fruit in the long term. Global energy consumption confronts us with a stark reality: we are short of resources and affordable or not, it is necessary to invest in renewables and especially in photovoltaic.
The costs of oil and gas are destined to increase as they will face a progressive exhaustion, while the sun is there and it is always abundant. The only problem is at the origin, that is, with the investments necessary for the preparation of photovoltaic systems. Solar energy is free, it is the systems that have high costs. moreover, solar energy is clean, which will help contain pollution levels so as to increase the quality of life and public health.

The Solar Thermal. Conventional solar can be "exceeded in performace and efficiency"From solar thermal systems. In the solar panels, the sun's heat is "trapped" and then converted into electricity. With solar thermal, energy is used on a larger scale, the heat of the sun is intended to heat fluids and vapors that will generally be used for turbines or other generators that will produce electric energy.

A virtuous example of solar thermal system high efficiency is given by the Andasol Commercial Solar Park, in Spain. It is the largest commercial plant in the world. It is equipped with three units, each capable of generating 50W of power. It is a solar thermal system, the heat collected by the modules is used to heat exchangers containing water. The resulting steam is converted into energy using a conventional steam turbine. The engineers of this Andalusian plant of solar power, have designed the parabolic reflectors so that the surplus of heat produced is stored in insulated tanks and the steam produced is used to generate energy during the night.

The Spanish plant is the first commercial solar thermal park in Europe, produces electricity to meet the energy needs of 6,000 homes. L'thermal system has a capacity of 11W. The entire park is about to obtain another 300 reflectors to increase energy production and reach 300W of power, the expansion is expected by 2013. Upon completion of these works, the plant will be capable of powering 180,000 homes. The park is located near Seville and sees about 300 days of sunshine a year. With such characteristics, the PS-10 park of Spain is not alone ecologically sustainable but also economically. Its realization took place thanks to grants from the Spanish government and the European Union.

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