III Conflict between intra-EU IIAs and EU law
Intra-EU investor-State arbitration has been contested by the EU Commission and some Member States for several years. Two main arguments were brought forward against the âinternational investment protection regimeâ applicable to intra-EU investments. First, the alleged invalidity of intra-EU BITs as an effect of the lex posterior rule because all intra-EU BITs were treaties concluded prior to the Lisbon Treaty and some Member Statesâ accession treaties. Second, the inapplicability of intra-EU IIAs, i.e. the intra-EU BITs and the ECT, due to the primacy of EU law. These arguments have generally been rejected by arbitral tribunals as well as the Advocate General Wathelet in his Achmea Opinion. The ECJ, however, has taken a different position in its Achmea decision.
If both EU law and international investment law are understood as equally being part of international treaty law, a conflict between them needs to be resolved according to the VCLT rules of conflict, namely its Art. 30 and Art. 59. However, if their relationship is understood as one of international to domestic law, with EU law being part of the domestic law of the Member States, Art. 27 VCLT could be applicable. In that case EU law could not be invoked to justify a violation of an international legal obligation and there would be no actual legal conflict between both regimes at the international level. Finally, if EU law is understood as something outside the classical dichotomy of domestic and international law, the VCLT cannot be readily applied to its relationship with international treaties.
Against this backdrop, the present chapter starts by assessing the position of EU law within the traditional dichotomy between international and domestic law (I.). It then reflects on the question of lex posterior and the possible invalidity of intra-EU BITs through new Member Statesâ accession to the EU (II.), before analysing the incompatibility argument, focusing on the Achmea judgment and other possible grounds of incompatibility as well as the arbitral practice on the matter (III.). The last part of this chapter assesses the relationship between the multilateral Energy Charter Treaty and EU law with regard to intra-EU investments (IV.), before summarizing the results of the analysis (V.).
I Nature of EU law and its relation to public international law
1 Particularity of EU law
The ânatureâ of the EU has been extensively discussed, especially whether the EU is an International Organization (IO) or even a State. In its institutional self-understanding, however, it clearly represents a new legal order and an organization sui generis. This will quickly be recapitulated in the following.
It is a common understanding that the EU is for a number of reasons not (yet) a State:1 It lacks âKompetenz-Kompetenzâ, i.e. a Stateâs competence to determine its own competences and cannot exercise public authority in an unlimited way but can only enjoy competences derived from its Member States.2 There is no European nation to constitute a European State. In difference to a federal Stateâs subdivisions, it is possible for Member States to leave the EU according to Art. 50 TEU.3 Furthermore, Member States can amend the EU Treaties by virtue of Art. 48 TEU. They remain full subjects of public international law, which is generally not the case for a federal Stateâs subdivisions.4