The European reference is the following:
- Directive 2009/73/EC of the European Parliament and of the Council, concerning common rules for the internal market in natural gas;
- Regulation 715/2009/CE, concerning the access to the natural gas transmission networks;
- Regulation 994/2010/CE concerning measures for safeguarding security of natural gas supply;
- Regulation 347/2013/CE of the European Parliament and of the Council about guidelines for trans-European energy infrastructure.