1. EU-Commission An energy policy for Europe 2007 http://ec.europa.eu/energy/energy_policy/doc/01_energy_policy_for_europe_en.pdf
2. EU-Commission Renewable energy road Map 2014 http://europa.eu/legislation_summaries/energy/renewable_energy/l27065_en.htm
3. Directive 2009/28/EC of the European Parliament and the Council of 23 April 2009 on the promotion of the use of energy from renewable sources and amending and subsequently repealing Directives 2001/77/EC and 2003/30/EC;EU-Parliament and EU-Council;Official Journal of the European Union,2009
4. Directive 2001/77/EC of the European Parliament and of the Council of 27 September 2001 on the promotion of electricity from renewable energy sources in the internal electricity market;EU-Pariament and EU Council;Official Journal of the European Union,2001