For the purposes of harmonization with the European Community act entitled

"Directive 2009/28/EC of the 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"

the law on the Promotion and Encouragement of the Use of Renewable Energy Sources Law of 2013 was introduced and amended by Laws 121(I)/2015 (repealed) and 157(I)/2015.