Decisions 26.07.2012 ACER Decision 02-2012 on Interoperability and Data Exchange Rules for European Gas Transmission Networks Decisions 02.12.2011 ACER Decision 06-2011 on Framework Guidelines on Electricity System Operations Decisions 16.09.2011 ACER Decision 04-2011 on the TYNDP 2011-2020 Presented by ENTSOG