...The Tribunal recalls the criteria provided by Art. 836 of the FTA: 4.In determining whether to grant the leave the Tribunal shall consider, among other things, the extent to which: (a) the applicant’s submission would assist the Tribunal in the determination of a factual or legal issue related to the arbitration by bringing a perspective, particular knowledge or insight that is different from that of the disputing parties...Having examined the respective arguments of the Parties and CCSI, the Tribunal finds that, while CCSI may have a wide experience in the field of sustainable investment, beyond the above mentioned extensive submissions by the Parties, it has not sufficiently been shown that CCSI would be able to contribute any further information or arguments that would assist the Tribunal in the determination of a factual or legal issue related to the arbitration by bringing a perspective, particular knowledge or insight that is different from that of the disputing parties.  Since CCSI’s application does not fulfill this first and most important threshold of Art. 836.4(a) of the FTA, it is sufficient for the Tribunal to add that the arguments submitted regarding the further criteria in subsections (b) to (d) do not provide any reason in the present case to nevertheless conclude that an acceptance of the application is appropriate...