SolarSpain is one of the most advanced countries in the development of solar energy, and it is one of the European countries with the most hours of sunshine. Spain ranks second in the world among both photovoltaic and thermoelectric solar power.The solar potential for Spain is amongst the best in Europe, if not the best. Spain and Portugal receive the most annual global horizontal solar irradiance on the European continent. The top five regions in Spain with the highest solar irradiation and thus the largest power capacity are Murcia, Andalusia, Extremadura, Ceuta y Melilla and Castilla de la Mancha with a potential amount of energy of more than 1,900 kWh/m² and with a potential output of about 1,400kWh/kWp. Around 10% of Spain’s energy comes from solar power, which is five times more than the average of 2% in the rest of the world.Wind EnergyThere are pockets of the country that far exceed the 6.5 m/s threshold; the northwest region of Galicia is a great example of this. The southernmost tip of Andalucía is also an area with more than enough wind resources for development. Another important note is the wind resource available offshore. Most of the he wind speed offshore well exceeds the 6.5 or greater m/s limit.Installed wind capacity in Spain reached 22,785 MW in 2012 with the addition of 1,112 MW, according to the Spanish Wind Energy Association’s (AEE) Wind Observatory. The growth has been similar to 2011, which had an increase of 1,050 MW. Spain is the fourth country in the world in terms of installed capacity and produced 48,156 GWh of electricity from wind in 2012. In 2012, Spain’s electrical energy demand decreased 1.8% from 2011 to 269.16 TWh. Wind energy met 17.8 % of this demand and was the third largest contributing technology in 2012.On 2nd February 2013 wind power achieved again a new record in electricity production reaching a peak of 17.056 MW and an average production per hour of 19.918 MWh.Biomass & BiofuelA study from the University of Zaragoza sought to find the energy potential of agro-industrial residue. The sources of residue used in the study involved olive mills, wineries, forestry residue, nut processing, rice mills, wastewater from meat processing from meat processing and dairies, and breweries. The energy potential for forestry and agricultural residues is split between technical limits and economic potential. First, the technical limit takes into consideration the location of resources and “the technical characteristics (including performance) of the equipment used for transforming the resource into electrical energy”. It was found that the technical limit was 32.7 TWh/year. Economic potential, which takes the generation costs into account, leads to a significantly lower potential, 12.87 TWh/year. An important note is that as time progresses and newer technologies are developed that generation costs may go down, thus increasing the amount of potential this source can generate. The potential, looking at it from the technical limit or the economic potential, can be anywhere from 12% of 2010 demand to about 5%. The technical limit and economic potential would amount to 9% and 3% of expected 2020 demand.GeothermalGeothermal sites with a high enough temperature exist in Canarias (Canary Islands), particularly the islands of Gran Canaria and Tenerife.HydroHydropower was one of the three renewable energies that contributed heavily towards Spain generating 35% renewable power in 2010. A good way to measure water supply is by measuring the average annual rainfall. The high average rainfall in the north, particularly the northwestern region, makes it the most suitable in the country for hydropower. Hydropower has great potential to add to the energy sector. Theoretically, hydropower is capable of providing 138 TWh of power; this estimation is after water consumption is taken into account.A more realistic potential was estimated at about 64 TWh/year. This would be enough to cover about 23% of the 2010 demand, and 18% of 2020 demand. Already over half of this estimation has been achieved; hydro plants generated 38.6 TWh and small hydro plants (≤ 10 MW) covered 6.8 TWh.