Regime Collision between EU Law and Investment Law: New Developments in the Vattenfall Case

EU law and international investment law are on collision course. The bone of contention is which court shall decide intra-EU investor-state disputes. While the ECJ indicated in its Achmea judgment that only itself and the domestic courts of the member states may decide such disputes, the Investment Tribunal in the Vattenfall case has now decided in the context of the Energy Charter Treaty that Achmea does not preclude its jurisdiction. How did this clash of courts arise and how can it be resolved?

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