Information;Judgment — ECLI:EU:T:2019:760
Date: 2019-10-24
Language of the case: English
Court formation: Seventh Chamber
Subject matter: Energy
Procedure: Action for annulment - successful;Action for annulment - inadmissible
Origin: Austria

JUDGMENT OF THE GENERAL COURT (Seventh Chamber) 24 October 2019 (*) (Energy — Decision of the Board of Appeal of ACER — Determination of the capacity calculation regions — Action for annulment — Interest in bringing proceedings — Inadmissible in part — Regulation (EU) 2015/1222 — ACER’s competence) In Case T‑333/17, Austrian Power Grid AG, established in Vienna (Austria), Vorarlberger Übertragungsnetz GmbH, established in Bregenz (Austria), represented by H. Kristoferitsch and S. Huber, lawyers, applicants, supported by Verbund AG, established in Vienna, represented by S. Polster, lawyer, intervener, v Agency for the Cooperation of Energy Regulators (ACER), represented by P. Martinet and E. Tremmel, acting as Agents, defendant, supported by Czech Republic, represented by M. Smolek, J. Vláčil and T. Müller, acting as Agents, by Republic of Poland, represented by B. Majczyna, acting as Agent, and by Polskie Sieci Elektroenergetyczne S.A., established in Konstancin-Jeziorna (Poland), represented by M. Szambelańczyk, lawyer, interveners, ACTION under Article 263 TFEU seeking annulment of Decision A-001-2017 (consolidated) of the Board of Appeal of ACER of 17 March 2017 dismissing the appeals brought against Decision No 6/2016 issued by ACER regarding the determination of capacity calculation regions, THE GENERAL COURT (Seventh Chamber), composed, at the time of deliberation, of V. Tomljenović (Rapporteur), President, A. Marcoulli and A. Kornezov, Judges, Registrar: E. Coulon, gives the following Judgment Background to the dispute 1 The applicants, Austrian Power Grid AG and Vorarlberger Übertragungsnetz GmbH are transmission system operators (‘TSOs’) for electricity in Austria. 2 On 13 November 2015, the European network of TSOs for electricity published a common proposal regarding the determination of capacity calculation regions, in accordance with Article 15 of Commission Regulation (EU) 2015/1222 of 24 July 2015 establishing a guideline on capacity allocation and congestion management (OJ 2015 L 197, p. 24). 3 On 17 November 2015, the TSOs submitted the common proposal regarding the determination of capacity calculation regions to the national regulatory authorities for approval pursuant to Article 9(6)(b) of Regulation 2015/1222. 4 On 13 May 2016, the national regulatory authority for Austria, Energie-Control Austria für die Regulierung der Elektrizitäts- und Erdgaswirtschaft (E-Control), requested that the TSOs amend the common proposal regarding the determination of capacity calculation regions (‘the amendment request of 13 May 2016’). 5 On 17 May 2016, the Chair of the Energy Regulators’ Forum, the platform through which the national regulatory authorities consulted and cooperated in order to reach an agreement on the common proposal regarding the determination of capacity calculation regions, informed the Agency for the Cooperation of Energy Regulators (ACER) that the national regulatory authorities could not reach a unanimous decision on the common proposal regarding the determination of capacity calculation regions. 6 On the same day, the Chair of the Energy Regulators’ Forum forwarded to ACER’s Director an email from E-Control, dated 13 May 2016, by which it informed the Chair that it intended to request that the TSOs amend the common proposal regarding the determination of capacity calculation regions. 7 On 18 May 2016, the Chair of the Energy Regulators’ Forum communicated the amendment request of 13 May 2016 to ACER’s Director. 8 On 17 November 2016, ACER adopted Decision No 6/2016 regarding the determination of capacity calculation regions. Article 1 of Decision No 6/2016 and Annex I thereto determine the capacity calculation regions in accordance with Article 15 of Regulation 2015/1222. According to Article 2 of Decision No 6/2016, the definition of bidding zone borders, given in Annex I thereto, is without prejudice to any decision adopted under Articles 32 to 34 of Regulation 2015/1222. 9 Decision No 6/2016 was the subject of four appeals to the Board of Appeal of ACER (‘the Board of Appeal’), namely the appeals brought by the applicants, the appeal brought by E-Control and the appeal brought by Verbund AG. By their appeals the applicants requested, inter alia: – annulment of Decision No 6/2016 in part, namely: – first, Article 1 in conjunction with Article 1(1)(c) of Annex I, second, the word ‘also’ and the text block ‘for the purposes of capacity allocation on the affected bidding zone borders until the requirements described in Article 5(3) [of Annex I] are fulfilled’ in Article 2(2)(e) of Annex I, third, Article 5(1)(s) of Annex I, fourth, Article 5(3) of Annex I and, fifth, Map No 3 in Annex I; – Article 2 and Annexes IV and V; – every other provision of Decision No 6/2016 which explicitly or implicitly introduces or recognises the introduction of a bidding zone border or capacity allocation at the German-Austrian border; – in the alternative, replacement of Decision No 6/2016 by a decision which does not provide for the introduction of a bidding zone border between Austria and Germany or the introduction of capacity allocation at the German-Austrian border; – in the further alternative, annulment of Decision No 6/2016 in its entirety. 10 On 31 January 2017, the Chairman of the Board of Appeal decided to consolidate the four appeals into one administrative procedure which was registered under the reference A-001-2017 (consolidated). 11 On 17 March 2017, the Board of Appeal adopted decision A-001-2017 (consolidated), dismissing the appeals against Decision No 6/2016 issued by ACER regarding the determination of capacity calculation regions (‘the contested decision’). By that decision, the appeals brought by the applicants and by E-Control were dismissed as unfounded, and the appeal brought by Verbund was dismissed as inadmissible. Procedure and forms of order sought 12 By application lodged at the Court Registry on 29 May 2017, the applicants brought the present action. 13 By document lodged at the Court Registry on 5 September 2017, Exaa Abwicklungsstelle für Energieprodukte sought leave to intervene in the present case in support of the form of order sought by the applicants. By order of 5 June 2018, Austrian Power Grid and Vorarlberger Übertragungsnetz v ACER (T‑333/17, not published, EU:T:2018:350), the Court dismissed that application for leave to intervene on the ground that the party concerned had not established that it had a direct and existing interest in the ruling on the form of order sought by the applicants. 14 By document lodged at the Court Registry on 14 September 2017, the Republic of Poland applied for leave to intervene in the proceedings in support of the form of order sought by ACER. By decision of 30 October 2017, the President of the Seventh Chamber of the General Court granted that leave to intervene. 15 By document lodged at the Court Registry on 15 September 2017, the Czech Republic applied for leave to intervene in the proceedings in support of the form of order sought by ACER. By decision of 30 October 2017, the President of the Seventh Chamber of the General Court granted that leave to intervene. 16 By document lodged at the Court Registry on 18 September 2017, Verbund applied for leave to intervene in the proceedings in support of the form of order sought by the applicants. By order of 27 April 2018, Austrian Power Grid and Vorarlberger Übertragungsnetz v ACER (T‑333/17, not published, EU:T:2018:285), the President of the Seventh Chamber of the General Court granted that leave to intervene. 17 By document lodged at the Court Registry on 21 September 2017, Polskie Sieci Elektroenergetyczne S.A. (‘PSE’) applied for leave to intervene in the proceedings in support of the form of order sought by ACER. By order of 4 December 2017, Austrian Power Grid and Vorarlberger Übertragungsnetz v ACER (T‑333/17, not published, EU:T:2018:880), the President of the Seventh Chamber of the General Court granted that leave to intervene. 18 The interveners submitted their statements in intervention and the other parties submitted their observations thereon within the periods prescribed. 19 In the context of the measures of organisation of procedure under Article 89 of its Rules of Procedure, the General Court, first, asked ACER to submit a document and, second, requested from ACER and the applicants written replies to a set of questions. The parties complied with those measures of organisation of procedure within the prescribed period. 20 By letter from the Court Registry dated 20 June 2019, the parties were informed that the Court had decided to rule without an oral part of the procedure, pursuant to Article 106(3) of the Rules of Procedure. 21 The applicants claim that the Court should: – primarily, annul the contested decision in its entirety and the following parts of Decision No 6/2016: – first, Article 1 in conjunction with Article 1(1)(c) of Annex I, second, the word ‘also’ and the text block ‘for the purposes of capacity allocation on the affected bidding zone borders until the requirements described in Article 5(3) [of Annex I] are fulfilled’ in Article 2(2)(e) of Annex I, third, Article 5(1)(s) of Annex I, fourth, Article 5(3) of Annex I and, fifth, Map No 3 in Annex I; – Article 2 and Annexes IV and V; – in the alternative, annul the contested decision in its entirety and refer the case back to the Board of Appeal; – order ACER to pay the costs. 22 ACER contends that the Court should: – dismiss the action; – order the applicants to pay the costs. 23 The Czech Republic contends that the Court should: – dismiss the action; – order the applicants to pay the costs. 24 The Republic of Poland contends that the Court should dismiss the action as inadmissible or unfounded. 25 PSE contends that the Court should dismiss the action. 26 Verbund claims that the Court should: – annul the contested decision in its entirety and the following parts of Decision No 6/2016: – first, Article 1 in conjunction with Article 1(1)(c) of Annex I and, second, the word ‘also’ and the text block ‘for the purposes of capacity allocation on the affected bidding zone borders until the requirements described in Article 5(3) [of Annex I] are fulfilled’ in Article 2(2)(e) of Annex I; – Article 2 and Annexes IV and V; – in the alternative, annul the contested decision in its entirety and refer the case back to the Board of Appeal. Law 27 In support of the action, the applicants rely on seven pleas in law. The first plea in law alleges that ACER is not competent to amend the TSOs’ common proposal regarding the determination of capacity calculation regions. The second plea in law alleges that the Board of Appeal erred in assuming that ACER was authorised to disregard the amendment request of 13 May 2016 and that it was therefore competent to adopt Decision No 6/2016. The third plea in law alleges that the Board of Appeal erred in assuming that ACER was competent to determine bidding zones under the procedure set out in Article 15 of Regulation 2015/1222. The fourth plea in law alleges that the Board of Appeal erred in its interpretation of ‘structural congestion’ and in its scope of review. The fifth plea in law alleges that the Board of Appeal erred in considering the splitting of the German-Austrian bidding zone to be proportional. The sixth plea in law alleges that the Board of Appeal erred in finding that the introduction of a German-Austrian bidding zone does not restrict the fundamental freedoms. The seventh plea in law alleges that the Board of Appeal erred in considering that Decision No 6/2016 issued by ACER complied with the procedural rules. Admissibility 28 In the present case, it is necessary to examine three objections of inadmissibility. First, ACER, supported by the Republic of Poland, disputes the admissibility of the action in so far as it seeks the annulment of Decision No 6/2016. Second, it is necessary for the Court to examine of its own motion whether the applicants have a legal interest in bringing proceedings as regards the annulment of the contested decision in so far as it dismissed the administrative appeals brought by third parties. Third, it is necessary for the Court to examine of its own motion the admissibility of the applicants’ head of claim seeking to refer the present case before the Board of Appeal. The challenge to Decision No 6/2016 29 ACER, supported by the Republic of Poland, disputes the admissibility of the action in so far as it seeks the annulment of Decision No 6/2016. The applicants were fully entitled to exercise their right of appeal against Decision No 6/2016 before the Board of Appeal. However, according to ACER, they do not have the right to bring a direct action for annulment against Decision No 6/2016. 30 The applicants dispute those arguments. 31 As a preliminary remark, it is important to note that, in the present case, the only act which may be appealed before the Court is the contested decision. 32 In this case, Decision No 6/2016 was adopted on the basis of Article 9(11) of Regulation 2015/1222 which provides that ACER is to adopt a decision in accordance with the procedure provided for in Article 8(1) of Regulation (EC) No 713/2009 of the European Parliament and of the Council of 13 July 2009 establishing an Agency for the Cooperation of Energy Regulators (OJ 2009 L 211, p. 1). According to Article 19 of Regulation No 713/2009, a decision referred to, inter alia, in Article 8 of the same regulation may be appealed to the Board of Appeal. Pursuant to Article 20(1) of Regulation No 713/2009, only decisions taken by the Board of Appeal or, in cases where no right lies before the Board of Appeal, by ACER, may be contested before the Court in accordance with Article 263 TFEU. Since the contested decision was adopted under Article 19 of Regulation No 713/2009, it is the only act which may be appealed before the Court in the present case. 33 Furthermore, as the Republic of Poland correctly argues, as regards the head of claim seeking annulment of Decision No 6/2016, the present action was brought after the expiry of the period specified in the sixth paragraph of Article 263 TFEU and must, as a result, be considered, as regards that decision, out of time. 34 Lastly, in so far as the applicants appear to ask the Court to order an injunction against the Board of Appeal, seeking annulment in part of Decision No 6/2016, it must be noted that, when reviewing lawfulness on the basis of Article 263 TFEU, the Court has no jurisdiction to issue directions to the institutions, bodies, offices and agencies of the European Union, even where they concern the manner in which its judgments are to be complied with (see order of 19 July 2016, Trajektna luka Split v Commission, T‑169/16, not published, EU:T:2016:441, paragraph 13 and the case-law cited). It is for the institution, body, office or agency in question to take the necessary measures to comply with a judgment of the Court delivered in an action for annulment (see order of 22 June 2015, In vivo v Commission, T‑690/13, not published, EU:T:2015:519, paragraph 31 and the case-law cited). 35 It follows from the foregoing that the action is inadmissible in so far as it seeks the annulment in part of Decision No 6/2016 or to have the Board of Appeal ordered to annul that decision. The legal interest in bringing proceedings 36 An interest in bringing proceedings is an essential and fundamental prerequisite for any legal proceedings (judgment of 10 April 2013, GRP Security v Court of Auditors, T‑87/11, not published, EU:T:2013:161, paragraph 44) and must, in the light of the purpose of the action, exist at the stage of lodging the action, failing which the action will be inadmissible. The interest in bringing proceedings must continue until the final decision (see judgment of 7 June 2007, Wunenburger v Commission, C‑362/05 P, EU:C:2007:322, paragraph 42 and the case-law cited). 37 In order to ensure the proper administration of justice, any person bringing legal proceedings must have a vested and current interest in doing so, irrespective of the legal remedy chosen (see order of 22 June 2016, European Dynamics Luxembourg and Others v EMA, T‑440/15, not published, EU:T:2016:400, paragraph 36 and the case-law cited). An interest in bringing proceedings presupposes that the action is likely, if successful, to procure an advantage for the party bringing it (see, to that effect, judgments of 19 July 2012, Council v Zhejiang Xinan Chemical Industrial Group, C‑337/09 P, EU:C:2012:471, paragraph 46 and the case-law cited, and of 18 March 2009, Shanghai Excell M&E Enterprise and Shanghai Adeptech Precision v Council, T‑299/05, EU:T:2009:72, paragraph 43 and the case-law cited). 38 It is for the applicant to prove its interest in bringing proceedings (judgment of 14 April 2005, Sniace v Commission, T‑141/03, EU:T:2005:129, paragraph 31, and order of 21 January 2016, Proforec v Commission, T‑120/15, not published, EU:T:2016:50, paragraph 20). 39 In the present case, by their form of order sought, the applicants seek the annulment of the contested decision in its entirety. In the contested decision, the Board of Appeal dismissed the appeals brought by each of the applicants seeking the annulment of Decision No 6/2016, but also those brought by E-Control and by Verbund. 40 It must be stated that the applicants have provided no evidence to demonstrate that the annulment of the contested decision in so far as it dismissed the administrative appeals brought by E-Control and by Verbund is capable of procuring any advantage for them beyond the benefit that they would obtain from any annulment of the contested decision in so far as it dismisses their own administrative appeals. The applicants have therefore failed to demonstrate their interest in bringing proceedings in that regard. 41 Accordingly, the present action must be dismissed as inadmissible in so far as it seeks the annulment of the contested decision in as much as it dismissed the administrative appeals brought by E-Control and by Verbund. Admissibility of the request to refer the present case back to the Board of Appeal 42 By the head of claim raised in the alternative, the applicants ask the Court, following the annulment of the contested decision, to refer the case back to the Board of Appeal. 43 As was set out in paragraph 34 above, it must be borne in mind that, when reviewing lawfulness on the basis of Article 263 TFEU, the Court does not have jurisdiction to issue directions to the institutions, bodies, offices and agencies of the European Union, even where they concern the manner in which its judgments are to be complied with. 44 The action must therefore be dismissed as inadmissible in so far as the applicants applied for the Court to refer the case back to the Board of Appeal. For the same reasons, the identical head of claim raised by Verbund must be rejected. The second plea in law, alleging that the Board of Appeal erred in holding that ACER was authorised to disregard the amendment request of 13 May 2016 and that it was competent to rule on the TSOs’ common proposal 45 In the context of their second plea, the applicants claim that the Board of Appeal erred in law in the contested decision when it found, in essence, that ACER was competent under Article 9(11) of Regulation 2015/1222 to adopt a decision on the TSOs’ common proposal, namely Decision No 6/2016, even though ACER had, since 18 May 2016, been aware that E-Control had submitted the amendment request of 13 May 2016. 46 ACER, supported by the Czech Republic, by the Republic of Poland and by PSE, disputes those arguments. 47 As a preliminary point, it must be noted that Article 15(1) of Regulation 2015/1222 provides that, by 3 months after the entry into force of that regulation, all TSOs are to jointly develop a common proposal regarding the determination of capacity calculation regions. 48 According to Article 9(6)(b) of Regulation 2015/1222, the proposals concerning the determination of the capacity calculation regions are subject to approval by all the national regulatory authorities. 49 It is clear from the first part of the sentence of Article 9(6) of Regulation 2015/1222 that the determination of the capacity calculation regions comes within the concept of ‘terms and conditions or methodologies’ referred to in Article 9(10) to (12) of the same regulation. 50 Article 9(10) of Regulation 2015/1222 states that, for the purposes of the approval of a proposal concerning ‘terms and conditions or methodologies’, the competent national regulatory authorities are to consult and closely cooperate and coordinate in order to reach an agreement. The national regulatory authorities are to take decisions concerning the TSOs’ common proposal within 6 months following the receipt of that proposal. 51 In accordance with Article 9(11) of Regulation 2015/1222, read in conjunction with Article 8(1) of Regulation No 713/2009, where the national regulatory authorities have not approved the TSOs’ common proposal because they have not been able to reach agreement as regards that proposal within 6 months, or upon their joint request, ACER is to decide whether to approve that proposal. It follows from Article 9(11) of Regulation 2015/1222 that failure on the part of the national regulatory authorities to reach agreement, within that period, as regards approval of the TSOs’ common proposal is what gives ACER the competence to adopt a decision concerning that proposal. 52 The first sentence of Article 9(12) of Regulation 2015/1222 provides that one or several national regulatory authorities may request an amendment of a proposal concerning the ‘terms and conditions or methodologies’. It also follows from that provision that, if an amendment request is submitted to the TSOs, those TSOs, in turn, are to submit an amended common proposal to the national regulatory authorities for approval within 2 months following the request. According to the second sentence of Article 9(12) of that regulation, the competent national regulatory authorities are to decide on the amended common proposal within 2 months following its submission. Lastly, according to the third sentence of Article 9(12) of that regulation, where the competent national regulatory authorities have not been able to reach agreement on the amended common proposal within the two-month deadline, or upon their joint request, ACER is to adopt a decision on that amended common proposal. 53 It is clear from a combined reading of Article 9(10) of Regulation 2015/1222 and Article 9(12) of the same regulation that, given that the power to approve a common proposal from the TSOs is conferred on ACER after the expiry of the six-month period during which the national regulatory authorities may approve the proposal, any such amendment request must necessarily be submitted during the six-month period referred to in Article 9(10) of Regulation 2015/1222, unless a joint request from the regulatory authorities, such as that referred to in Article 9(12) of Regulation 2015/1222, has already been made to ACER before the expiry of that deadline. 54 In addition, it follows by necessary implication from Article 9(12) of Regulation 2015/1222 that, as soon as an amendment request has been submitted, in principle, ACER cannot approve an initial common proposal from the TSOs on the basis of Article 9(11) of that regulation. The mere fact that a national regulatory authority submits an amendment request to the TSOs has the result that ACER does not acquire the decision-making power referred to in Article 9(11) of Regulation 2015/1222. 55 By contrast, ACER is competent to decide on a common proposal from the TSOs where, despite the existence of an amendment request, the national regulatory authorities confer on that agency, under Article 9(11) of Regulation 2015/1222, by means of a joint request, the task of approving the common proposal initially submitted by the TSOs or where, if no such amendment request has been submitted, those national authorities unanimously choose to shorten the period of 6 months referred to in Article 9(10) of that regulation. 56 If the TSOs concerned do not submit an amended proposal, the procedure provided for in Article 9(4) of Regulation 2015/1222 applies. That provision provides that, if the TSOs fail to submit to the national regulatory authorities an amended common proposal for ‘terms and conditions or methodologies’ within the deadlines defined, they are to provide the competent national regulatory authorities and ACER with the relevant drafts of the amended proposal, and explain what has prevented agreement. ACER is to inform the European Commission and, in cooperation with the competent national regulatory authorities, at the Commission’s request, is to investigate the reasons for the failure and inform the Commission thereof. Within 4 months from the receipt of ACER’s information, the Commission is to take the appropriate steps to make the adoption of the required ‘terms and conditions or methodologies’ possible. 57 In the present case, it is common ground that, on 17 November 2015 the TSOs submitted their common proposal of 13 November 2015 regarding the determination of capacity calculation regions in accordance with Article 15(1) of Regulation 2015/1222 and that the national regulatory authorities did not reach agreement regarding that proposal. Thus, when, on 17 May 2016, the Chair of the Energy Regulators’ Forum informed ACER of the failure to reach agreement, the latter seemed to have become competent to adopt a decision on that proposal under Article 9(11) of Regulation 2015/1222. 58 However, a request for amendment drawn up by E-Control had existed since 13 May 2016, seeking, in essence, first, removal of the German-Austrian bidding zone border and, second, the merging of the two regions into a single capacity calculation region. It is common ground that that amendment request was submitted to the TSOs by E-Control on 13 May 2016 and, therefore, before expiry of the six-month period referred to in Article 9(10) of Regulation 2015/1222, namely, in the present case, 17 May 2016. Lastly, it is common ground that as at 13 May 2016 no joint request from the national regulatory authorities had been made asking ACER to adopt a decision in accordance with Article 9(11) of that regulation. The amendment request of 13 May 2016 was brought to the attention of ACER on 18 May 2016. 59 In those circumstances, in view of what has been stated in paragraphs 47 to 56 above, it must be found that, because of E-Control’s submission to the TSOs of the amendment request of 13 May 2016, ACER did not have the power to adopt a decision on the TSOs’ common proposal of 13 November 2015 in the context of the procedure set out in Article 9(11) of Regulation 2015/1222. 60 Accordingly, the Board of Appeal made an error in law by finding that ACER still had competence, under Article 9(11) of Regulation 2015/1222, to adopt a decision on the TSOs’ proposal of 13 November 2015 regarding the determination of capacity calculation regions, even though it was aware that E-Control had submitted an amendment request, that the TSOs had not had the opportunity to draft an amended common proposal in response to that request and that the national regulatory authorities had not had the opportunity to reach agreement on such an amended proposal. 61 That finding is not called into question by the other arguments of ACER and the parties who intervened in support of its form of order sought. 62 First, as regards ACER’s argument that it dealt with and took into account the content of the amendment request of 13 May 2016, it must be noted from the outset that ACER did not grant that request for amendment in its entirety. More specifically, it did not grant that request in so far as it sought to remove the German-Austrian bidding zone border. 63 In addition, it must be stated that the fact that a national regulatory authority has, under Article 9(12) of Regulation 2015/1222, submitted an amendment request, means that ACER does not acquire the power which it is able to obtain under Article 9(11) of that regulation (see paragraph 54 above). Under Article 9(12) of that regulation, when an amendment request has been submitted, ACER obtains decision-making powers when the specific conditions of that provision have been satisfied. Those conditions are, first, that the TSOs have formulated an amended common proposal and, second, that the national regulatory authorities have been unable to reach agreement on the amended common proposal or have made a joint request to ACER as regards that amended proposal. 64 Therefore, contrary to what ACER claims, the fact that, in the present case, ACER took the amendment request of 13 May 2016 into account cannot remedy the fact that, as a result of the submission of that request, it did not have the competence referred to in Article 9(11) of Regulation 2015/1222 to adopt Decision No 6/2016. In addition, ACER’s having, in the present case, allegedly taken into account, in part, the amendment request of 13 May 2016 in Decision No 6/2016 does not change the circumstance that it did not comply with the procedural steps provided for in Article 9(12) of Regulation 2015/1222 and that, in fact, as regards the competence to adopt a decision and the procedure followed, Decision No 6/2016 is outside the regulatory framework laid down in Article 9(11) and (12) of Regulation 2015/1222. The adoption of Decision No 6/2016 constituted an interference both in the exercise of the TSOs’ right to formulate an amended common proposal regarding the determination of capacity calculation regions and in the exercise of the right of the national regulatory authorities, of which E-Control is one, to approve such an amended proposal. 65 Lastly, in its pleadings, ACER relied on a letter dated 13 July 2016 from the Secretary General of the European Network of TSOs for electricity. According to ACER, by that letter, which had been sent to its Director, the TSOs had indicated that they would not submit an amended common proposal regarding the determination of capacity calculation regions. 66 It must be noted that, in that letter, which was placed in the file before the Court as annex B.3 to the defence, the Secretary General of the European Network of TSOs for electricity argued, inter alia, that, since communication of the common proposal regarding the determination of capacity calculation regions to the national regulatory authorities in November 2015, neither all TSOs nor its organisation had received any formal communication on the approval process regarding that common proposal. It is clear from this letter that, following the amendment request of 13 May 2016, the TSOs had not been asked to provide an amended common proposal regarding the determination of capacity calculation regions. However, the letter of 13 July 2016 contains no express claim that the TSOs had refused or might have considered refraining from submitting an amended common proposal. 67 If that letter were to be construed as a failure or refusal by the TSOs to submit an amended proposal following the amendment request of 13 May 2016 submitted by the Austrian regulatory authority within the deadline, then the last sentence of Article 9(12) of Regulation 2015/1222 would apply, that provision referring to the procedure set out in Article 9(4) of that regulation. However, in the present case, it is common ground that that procedure was neither triggered nor followed. 68 Accordingly, ACER’s argument that the contested decision was not vitiated by any error because the agency had, in Decision No 6/2016, upheld in part the amendments submitted by E-Control, must be rejected as unfounded. 69 Second, ACER claims that the amendment request of 13 May 2016 was not valid under Article 9(12) of Regulation 2015/1222 and that, accordingly, that request did not prevent it from adopting a decision on the TSOs’ common proposal regarding the determination of capacity calculation regions, in accordance with Article 9(11) of that regulation. According to ACER, an amendment request submitted under Article 9(12) of Regulation 2015/1222 should have been validated by all the national regulatory authorities of the Member States concerned, in accordance with Article 9(6) and (10) of Regulation 2015/1222, in particular in order to ensure the effectiveness of that procedure. Yet the amendment request of 13 May 2016 was submitted unilaterally, that is to say without the agreement of the other competent regulatory authorities. 70 First of all, it must be noted that the first sentence of Article 9(12) of Regulation 2015/1222 states expressly that a request for amendment of a TSO common proposal regarding the determination of capacity calculation regions may be validly submitted by ‘one or several [national] regulatory authorities’. Having regard to the use of the word ‘one’ in that provision and the fact that that word neither lacks clarity, in any way, nor gives rise to doubt as regards its interpretation, and if the first sentence of Article 9(12) of Regulation 2015/1222 is not to be deprived, in part, of practical effect, it cannot be necessary for the regulatory authorities other than the national regulatory authority which submitted an amendment request to agree with the content of that request in order for such a request to be considered valid. 71 That conclusion is confirmed by the context surrounding Article 9(12) of Regulation 2015/1222. 72 In that regard, it must be noted that Article 15(1) of Regulation 2015/1222 gives the TSOs alone the right to develop the common proposal regarding the determination of capacity calculation regions. According to Article 9(6)(b) and (10) of that regulation, the national regulatory authorities, for their part, have merely a right to approve the common proposal regarding the determination of capacity calculation regions. Thus, when the common proposal regarding the determination of capacity calculation regions is formally submitted to the national regulatory authorities for the first time, those authorities do not have the right to make their own decision to amend that proposal. 73 By giving each national regulatory authority the opportunity, though only on one occasion, to submit a request for amendment of a TSO common proposal, Article 9(12) of Regulation 2015/1222 seeks to establish a balance between the right of the TSOs to submit such a proposal, on the one hand, and the lack of power of the national regulatory authorities to amend that proposal on their own initiative, on the other. 74 Next, contrary to what the Czech Republic maintains, the possibility to unilaterally request an amendment of the common proposal regarding the determination of capacity calculation regions does not render the procedure set out in Article 9(12) of Regulation 2015/1222 redundant. The Czech Republic claims, more specifically, that, in the event that some of the relevant national regulatory authorities refuse to approve the amendments requested by another regulatory authority, an agreement referred to in Article 9(10) of Regulation 2015/1222 would not be possible and it would therefore be necessary for ACER to adopt a decision in accordance with Article 9(11) of Regulation 2015/1222. In that regard, it is sufficient to state, first, that as a result of an amendment request having been submitted, Article 9(10) and (11) of Regulation 2015/1222 is no longer, in principle, applicable, and, second, that that argument does not call into question the possibility that any amendment submitted will be approved by all the relevant national regulatory authorities. 75 It is therefore necessary to reject the arguments that the purpose of Article 9(12) of Regulation 2015/1222 requires, in the present case, that the amendment request of 13 May 2016 was validated by all the relevant national regulatory authorities. In addition, the fact that a single national regulatory authority has the right to request amendments to the common proposal regarding the determination of capacity calculation regions does not render the procedures set out in Regulation 2015/1222 redundant. 76 Third, ACER takes the view that the second plea raised in support of the action is manifestly not adequately substantiated on the grounds that the applicants did not set out the reasons why, in their opinion, the Board of Appeal was wrong not to have raised an objection against the fact that ACER relied on Article 9(11) of Regulation 2015/1222. 77 In that regard, it should be noted that it is clear from the application that, according to the applicants, ever since the submission of the amendment request of 13 May 2016, the conditions for applicability of Article 9(11) of Regulation 2015/1222 were no longer satisfied. According to the applicants, therefore, ever since the submission of that request ACER no longer had the right to adopt a decision under its competence referred to in Article 9(11) of Regulation 2015/1222, such as Decision No 6/2016. Furthermore, although ACER argues that the applicants do not set out why the reasoning in the contested decision and concerning an alleged lack of competence was ‘inappropriate’, it is important to note that, by the second plea, the applicants do not make any argument alleging insufficient reasoning of the contested decision. 78 In those circumstances it is necessary to reject the argument that the second plea in law is manifestly not adequately substantiated. 79 It follows from the above that the Board of Appeal made an error in law by finding, in the contested decision, that ACER correctly adopted Decision No 6/2016 on the basis of Article 9(11) of Regulation 2015/1222. 80 In the light of all the foregoing, the second plea in law must be accepted and, therefore, the contested decision must be annulled in so far as it dismisses the appeals brought by the applicants against Decision No 6/2016. Costs 81 Under Article 134(1) of the Rules of Procedure, the unsuccessful party is to be ordered to pay the costs if they have been applied for in the successful party’s pleadings. 82 Under Article 134(3) of the Rules of Procedure, the parties are to bear their own costs where each party succeeds on some and fails on other heads. However, if it appears justified in the circumstances of the case, the General Court may order that one party, in addition to bearing his own costs, pay a proportion of the costs of the other party. 83 It is a fair assessment of the circumstances in the present case to have the applicants bear three quarters of their own costs and to order ACER, in addition to bearing its own costs, to pay one quarter of the costs incurred by the applicants, in accordance with their pleadings. 84 In accordance with Article 138(1) of the Rules of Procedure, the Member States which have intervened in the proceedings are to bear their own costs. As a result the Czech Republic and the Republic of Poland are to bear their own costs. 85 According to Article 138(3) of the Rules of Procedure, the Court may order an intervener other than those referred to in Article 138(1) and (2) of those rules to bear his own costs. It should therefore be held that Verbund and PSE are to bear their own costs. On those grounds, THE GENERAL COURT (Seventh Chamber) hereby: 1. Annuls Decision A-001-2017 (consolidated) of the Board of Appeal of the Agency for the Cooperation of Energy Regulators (ACER) of 17 March 2017 dismissing the appeals against Decision No 6/2016 issued by ACER regarding the determination of capacity calculation regions in so far as it dismisses the appeals brought by Austrian Power Grid AG and by Vorarlberger Übertragungsnetz GmbH; 2. Dismisses the action as to the remainder; 3. Declares that ACER is to bear its own costs and orders it to pay one quarter of the costs incurred by Austrian Power Grid and by Vorarlberger Übertragungsnetz; 4. Declares that Austrian Power Grid and Vorarlberger Übertragungsnetz are to bear three quarters of their own costs; 5. Declares that the Czech Republic, the Republic of Poland, Verbund AG and Polskie Sieci Elektroenergetyczne S.A. are to bear their own costs. Tomljenović Marcoulli Kornezov Delivered in open court in Luxembourg on 24 October 2019. E. Coulon D. Gratsias Registrar President * Language of the case: English.