These Regulations amend the Electricity (Single Wholesale Market) (Northern Ireland) Order 2007 to clarify the functioning of the Single Electricity Market (SEM) within the EU legal framework, specifically the Electricity Market Regulation and the network codes and guidelines developed under that Regulation. The first of these is Regulation (EU) 2015/1222 of 24 July 2015 establishing a Guideline on Capacity Allocation and Congestion Management. Article 83 of that Regulation requires Northern Ireland to implement preparatory transitional measures to facilitate full implementation of and full compliance with that Regulation by 31 December 2017.