Decisions 26.07.2012 ACER Decision 02-2012 on Interoperability and Data Exchange Rules for European Gas Transmission Networks Decisions 26.06.2012 ACER Decision 01-2012 Relating to the Registration Format Pursuant to Article 9(3) of Regulation (EU) No 1227/2011 Decisions 06.02.2012 Director Decision 2012-06 on the Rules for the Functioning of the ACER Working Groups and repealing Director Decision 2011-002 and Director Decision 2011-009 Decisions 02.12.2011 ACER Decision 06-2011 on Framework Guidelines on Electricity System Operations Decisions 28.09.2011 Director Decision 2011-019 on Holidays for 2012 for ACER Decisions 16.09.2011 ACER Decision 04-2011 on the TYNDP 2011-2020 Presented by ENTSOG