The Council of the European Union is an Institution with a formal legislative role. It is composed of different configurations of national Ministers (one per country). The exact configuration of each meeting depends on the topic under discussion. Generally at the TTE Council, Ireland is represented by Leo Varadkar TD.
For more information: http://www.eu2013.ie/events/event-items/meetingoftransporttelecommunicationsandenergycounciltte-20130222/