The operation of the EU Emissions Trading Scheme and of the Registry is governed by Directive 2003/87/EC establishing a scheme for greenhouse gas emission allowance trading, as amended by Directive 2004/101/EC  in respect of the Kyoto Protocol’s project mechanisms and Directive 2009/29/EC in respect of improving and extending the greenhouse gas emission allowance trading scheme of the Community.

The revised ETS Directive (Directive 2009/29/EC) provides for the centralisation of the EU ETS operations into a single European Union Registry, operated by the Commission.  The single Union registry has replaced all EU ETS registries hosted in the Member States since June 2012.

These Directives were transposed nationally through the European Communities (Greenhouse Gas Emission Trading) Regulations 2004 to 2005 (S.I. 437 of 2004 and S.I. 706 of 2005), and the Kyoto Protocol Flexible Mechanisms Regulation (S.I. 244 of 2006).

The technical and operational detail regarding the requirements for the implementation and operation of the Registry system over the period 2013-2020 is governed by Commission Regulation (EC) No 389/2013.  Read Commission Regulation No. 389/2013 of 2 May 2013.