Case C-439/06: Judgment of the Court (Third Chamber) of 22 May 2008 (reference for a preliminary ruling from the Oberlandesgericht Dresden, Germany) — Energy management proceedings between citiworks AG (Intervening party: Sächsisches Staatsministerium für Wirtschaft und Arbeit als Landesregulierungsbehörde), on the one hand, and Flughafen Leipzig/Halle GmbH and Bundesnetzagentur, on the other (Internal market in electricity — Directive 2003/54/EC — Article 20(1) — Open access of third parties to electricity transmission and distribution systems)