Teresa Miranda

1. IntroductionIn January 2014, the European Union presented some climate and energy targets to achieve in 2030 [1], which imply more contribution of renewable energies to the energy mix, although with a postponement of the achievement for these goals. The preceding scenario, the well-known 20-20-20 target, was signed in 2008 and implied, compared to 1990, 20% reduction in CO2 emissions by 2020, c ...