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2. Directive 2010/31/EU. European Parliament and of the Council of 19 May 2010 on the Energy Performance of Buildings (recast);EU;Off. J. Eur. Union,2010
3. EU, Directive 2012/27/EU. European Parliament and of the Council of 25 October 2012 on energy efficiency, amending Directives 2009/125/EC and 2010/30/EU and repealing Directives 2004/8/EC and 2006/32/EC.
4. EU, Directive 2009/28/EU. European Parliament and of 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.
5. Understanding (the very European concept of) Nearly Zero Energy Buildings;European Council for an Energy Efficient Economy (ECEE),2014