ABSTRACT
One of the current challenges of the European Union (EU) is to achieve energetic independence. Thus, EU established in 2009 that 20% of the final energy consumption must come from renewable energies by 2020 (Official Journal of the European Union 2009). In this context, among the main sources of renewable energy, wind energy is one of the most developed in the world. In fact, in relation to the installed power, wind power ranks third with 21% of new installations in 2011, after the photovoltaic solar (47%) and gas (22%), as Figure 1 is shown (Global Wind Energy Council (GWEC) 2012):
In the Galician area (North-West of Spain), according to the Instituto Enerxético de Galicia (INEGA), 65.9% of the electricity generated in Galicia came from renewable energy sources (Instituto Enerxético de Galicia (INEGA) 2010). In particular, hydropower and wind power generation are the most important energy resources in Galicia, being wind energy the 42.5% in 2010.
