ABSTRACT
According to the energy and climate strategies of the EU, at least 20% of Europe’s energy demand should be covered by renewable energy by 2020. From 1990 until 2009, the renewable energy share of the EU energy consumption rose from 4 to 9% while the overall amount rose from 1665 Mtoe to 1703 Mtoe (European Commission, 2011). Therefore, the need to increase the application of renewable energy is still present, even though the overall energy consumption will be decreased at the same time by 20%.
