Projections for the coming decades reveal an average annual Growth above 2.0%, Mowing primarily to an increase in world population and the rapid Development of emerging economies like China, India and Brazil (IEA, 2009). At this rate, global energy demand is expected to double and global electricity demand will triple between2008 and 2050 (EIA, 2010).It becomes evident that this trend is unsustainable. From an environmental perspective, the massive combustion of fossil fuels has been held responsible for irreversible changes to the global climate, with profound consequences to the planet and our way of life (IPCC, 2007). With regard to the economy, the imbalance between increasing demand and the ongoing depletion of finite natural resources will push the price of fossil fuels up in the medium term. Unless the use of alternative energy sources is sufficiently widespread, this scenario will lead to international conflicts and severe contraction of the global economy with detrimental consequences to the standard of living of most people. The solution to this situation rests on two pillars: on the one hand, a reduction in the overall consumption of primary energy that should be achieved through implementation of energy efficiency measures and technologies. On the other, the promotion of locally available and less carbon intensive alternative energy sources that should progressively replace fossil fuels (Stern, 2006; IPCC, 2007; Demirbas et al., 2009).