It seems appropriate to start by considering the options of the effects and consequences of the decisions of international dispute settlement bodies, in general, and of investment arbitral tribunals, in particular, in order to make specific recommendations for the structuring of the decisions of an MIC.

6.1 Legal Effects of Decisions of International Dispute Settlement Bodies

In theory, a wide range of legal effects of decisions of international dispute settlement bodies exists, from pure declaratory decisions without a strict obligation to comply, to annulments with direct effect on the contested legal act, in the sense of decisions modifying a legal right.

In practice, however, there are usually hybrid forms, such as declaratory decisions, advisory opinions or decisions that oblige a party to perform a certain act which must be complied with in substance, or annulments that relate only to internal acts of the organisation, the acting body of which is a dispute settlement body. A genuine annulment of national rules by decisions of international courts and thereby modifying a legal right is practically non-existent and would probably also be contrary to the system.

Typically, proceedings before international courts lead to a decision which has declaratory effect but whose binding force for the parties to the dispute results in a clear obligation to comply with the decision.Footnote 1 That is, even if an international court finds that a national legal act (law, administrative act, national judgment or other acts) is unlawful under public international law, the former remains unaffected but the responsible state has to ensure that the unlawfulness is abolished. For example, in the case of decisions of the ICJ or the ECtHR, this may lead to an international obligation to repeal the national legal act.Footnote 2

The solution that states pay damages as an alternative to remove the international injustice is not found in decisions of the ICJ, but in some cases before human rights courts.Footnote 3 This was also discussed in the early investment arbitration practice when, in the course of the Libyan oil concession cases in the 1970s,Footnote 4 some arbitral tribunals permitted the expropriating state to elect for the option of compensation, even for expropriations in violation of international law, which in principle require restitution .Footnote 5

If it is desirable from a policy perspective that the decisions of an MIC should also not be subject to secondary obligations to repeal national legal acts, this should be explicitly set down.Footnote 6

For other international dispute settlement bodies, the legal effects of declaratory decisions may be even weaker. For example, WTO Panels and the WTO Appellate Body only have the power to find infringements, but not to order the removal of the illegal acts or alternatively, the payment of damages.Footnote 7 Rather, the power of the WTO Dispute Settlement Body is limited to “recommending” the WTO Members a WTO compliant behaviour going forward. Should the latter fail to comply with these recommendations, only countermeasures (“trade retaliation”) of the affected WTO Members can be approved, which allow them to compensate for the expected economic damage resulting from non-compliance with WTO rules and recommendations.

Of course, the above-mentioned collateral legal consequences of purely declaratory decisions have a steering effect, urging the disputing parties to implement the content of declaratory decisions to the extent that the unlawfulness is removed.

Particularities of the effects of decisions arise in individual courts of regional economic organisations. Of particular note in this context is the CJEU. Its decisions in proceedings between Member States and in infringement proceedings brought by the Commission against Member States for breaches of EU Law are declaratory; however, the TFEU implies a clear obligation of states to remove the illegality found therein.Footnote 8 Far-reaching effects of judgments are found in the so-called actions for annulment, which are, however, only directed against acts of Union institutions. They lead to the repeal of secondary legislation of the Union.Footnote 9 However, this is a quasi-constitutional judicial control of the legal acts of the Union institutions. It is significant that even the CJEU has no comparable jurisdiction with regard to unlawful acts of the Member States.

In summary, it can be said that general public international law does not foresee decisions of international judicial institutions that have a direct effect over national law. As a rule, there is only an obligation to remove any illegality of national legal acts under public international law and to comply with international obligations. This can also be mitigated by a mere liability for compensation.

6.2 Effects of Decisions of Investment Arbitral Tribunals

The legal effects of the decisions of investment arbitral tribunals are generally not expressly included in the respective investment protection treaties. Rather, they result from the applicable rules of procedure or from the general public international law principles of state responsibility.Footnote 10

According to Article 53 ICSID Convention, ICSID arbitral awards are binding on the parties to the dispute and are not subject to appeal (except for the possibilities of annulment, interpretation and revision of errors in calculations provided for in the Convention).Footnote 11

According to Article 34 para. 2 of the UNCITRAL Rules,Footnote 12 UNCITRAL awards are also final and binding, and are therefore not subject to appeal or other legal remedies in arbitration,Footnote 13 and must be implemented by the parties immediately.Footnote 14

In addition, the rules of the ICC,Footnote 15 the LCIA,Footnote 16 and the SCCFootnote 17 contain provisions that declare the arbitral awards rendered under the respective arbitration rules as final and binding.

The same applies to some sectoral and regional treaties with investment protection chapters such as NAFTAFootnote 18 and the ECT, which, while referring in principle to various procedural rules, still specifically lay down the finality and binding force.Footnote 19

This means, in practice, that arbitral tribunals can find violations of standards contained in investment protection treaties and determine compensation for lawful expropriations . For unlawful expropriations or other violations of investment protection standards, it can award damages or grant a decision (or award) for specific performance.

Ordering the restoration of the situation before the treaty infringement by arbitral tribunals would constitute an interference with the sovereignty of states. Therefore, arbitral tribunals have so far refused to order changes in national legal orders.Footnote 20 Even if under general public international law, according to Article 34 of the ILC Articles on State Responsibility,Footnote 21 compensation is a secondary form of redress which should only be effective in case of impossibility or inappropriateness of restoring the situation before the treaty infringement,Footnote 22 arbitral awards usually oblige states exclusively to pay damages .Footnote 23

However, it is generally accepted that arbitral tribunals can also award non-monetary remedies in arbitral awards.Footnote 24 Opposite opinions in the literature justify the refusal of non-monetary remedies in investment disputes primarily with practical problems of the enforcement of such arbitral awards.Footnote 25 Although the ICSID Convention in Article 54 only regulates the enforceability of pecuniary obligations resulting from arbitral awards, it cannot be concluded that non-monetary remedies , such as a right to the fulfilment of treaty obligations, should not be granted by an ICSID tribunal.Footnote 26 Some ICSID tribunalsFootnote 27 and non-ICSID tribunalsFootnote 28 have seized the opportunity to award non-monetary remedies.Footnote 29 Since only financial compensation can be enforced through ICSID, an investor may need to have recourse to the New York Convention for the enforcement of non-monetary claims.Footnote 30

Limiting the available remedies under international treaty law is legally possible. A number of investment protection agreements have introduced such limitations on damages in order to exclude non-monetary remedies.Footnote 31

Decisions of the MIC should essentially be limited to finding violations of investment protection standards and should have the power to award damages to the prevailing party. In addition, the power to determine the existence of a generally (not unlawful) indirect expropriation and to determine the amount of compensation due, which is usually enshrined in the individual investment protection treaties, should also be provided for.