The strong increase in the price of oil, and the dependency on oil from foreign, politically unstable countries has forced the European Union to develop programs to increase the efficiency of energy, not only in the industrial sector but also in residential and transports sectors. With common policies coming from the European Union, two countries with different economical and political conditions adapt these common policies to their reality. Spain, a strong developing country within the Union, and Germany, as a developed country, are approaching the same problems in different ways. Initially the focus was the development of renewable energies to power the increase in the industrial development of the Union, while at the same time finding ways to reduce our energy-dependency on foreign countries. The strong increase of energy prices has made it more urgent to develop programs to increase the energy efficiency in our countries.