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annul the decision of the ACER Board of Appeal of 28 May 2021, Case number A-001-2021 (cons.), concerning the appeal against the ACER Decision No. 30/2020 on the Redispatch and Countertrading Cost Sharing Methodology for the Capacity Calculation Region Core (the Contested Decision);

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order ACER to pay TransnetBW GmbH’s costs.

1.

First plea in law, alleging that scope of the RDCT Cost Sharing Methodology as confirmed by the Contested Decision is unlawful. The RDCT Cost Sharing Methodology as confirmed by the Contested Decision unlawfully extends the application of the polluter pays principle to the sharing of costs for remedial actions exercised on basically all transmission network elements in the Capacity Calculation Region Core, albeit this is by law designed to be an exemption from the general obligation of network owners to maintain and expand their networks according to the market need (owner pays principle).

2.

Second plea in law, alleging that the determination of a common loop flow threshold of 10 % in the RDCT Cost Sharing Methodology as confirmed by the Contested Decision is unlawful. ACER had no competence to determine a common loop flow threshold and respectively the ACER Board of Appeal had no competence to confirm the common loop flow threshold. The common loop flow threshold was set at a too low level of 10 % and was based on insufficient and contested data.

3.

Third plea in law, alleging that the penalisation of loop flows above threshold is unlawful. The penalization of loop flows above threshold in comparison to internal flows has no legal basis, violates the polluter pays principle, the principle of non-discrimination as well as the principle of proportionality and sets wrong incentives.

4.

Fourth plea in law, alleging that the ACER Board of Appeal unlawfully did carry out only a limited review of the complex technical and economic assessments, which were to be made by ACER in the course of the approval procedure of the RDCT Cost Sharing Methodology, which violates the mandatory intensity of review by the ACER Board of Appeal as defined by the Court in its ruling in the Aquind Case (General Court, Decision of 18 November 2020, Case No. T-735/18).