1. Directive 2009/28/EC on the promotion of the use of energy from renewable sources http://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:02009L0028-20151005&from=EN
2. Renewable Energy Prospects for the European Union. IRENA, 2018 https://www.irena.org/-/media/Files/IRENA/Agency/Publication/2018/Feb/IRENA_REmap_EU_2018.pdf
3. Clean Energy for all Europeans. Communication from the Commission COM(2016) 860 final https://eur-lex.europa.eu/resource.html?uri=cellar:fa6ea15b-b7b0-11e6-9e3c-01aa75ed71a1.0001.02/DOC_1&format=PDF
4. Directive 2010/31/EU on energy performance of buildings https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32010L0031&from=EN
5. Commission welcomes final vote on energy performance of buildings. European Commission – Press release, 17.04.2018 http://europa.eu/rapid/press-release_IP-18-3374_en.htm