European Union Agency for the Cooperation of Energy Regulators Agency overview Formed 3 September 2009 (2009-09-03) Jurisdiction European Union Headquarters Ljubljana, Slovenia Employees approx. 120 Agency executive Christian Pilgaard Zinglersen, Director Key document Regulation (EC) No 713/2009 Website www.acer.europa.eu/ Map Ljubljana European Union Agency for the Cooperation of Energy Regulators (European Union)