This thesis investigates competition law, State aid law and free-movement law in their interaction with Article 11 TFEU’s obligation to integrate environmental protection requirements into all activities and policies of the Union. The Article is formulated in broad and sweeping terms which makes integrating environmental protection requirements complex and context-dependent. The challenge of integrating environmental considerations is further increased as such integration in competition, State aid and free- movement law is different from other areas of EU action. The three areas are the core provisions protecting the internal market by prohibiting certain actions of the Member States and undertakings. Unlike in other areas, the EU is therefore not in the position to develop or design the actions but has to scrutinise the measure according to pre-established parameters. To address this challenge, a novel functional approach to environmental integration is developed. The approach should facilitate a better understanding of environmental integration and in particular its application to competition law, State aid and free-movement law. An important element of this thesis equally the comparison between the three areas of law. It sheds light on conceptual issues that are not only relevant to the integration of environmental protection. The comparison advances the understanding in relation to questions such as how restrictions are defined and how the respective balancing tests are applied. The contribution of this research is therefore twofold. One the one hand, it compares how the different tests in competition, State aid and free-movement law operate, thereby offering opportunities for cross-fertilisation. On the other hand, this comparison and the improvements suggested as a result help to conceptualise environmental integration thereby paving the way for a more transparent and consistent integration of environmental protection in competition, State aid and free-movement law.

Europe is facing a climate and environmental crisis. To respond to this, the European Commission has launched several programmes, which aim to increase sustainability and environmental protection. This aim has been condensed into the policy document that is the European Green Deal. The European Green Deal sets out the aim of making the Union’s economy climate neutral, while improving environmental protection and protecting biodiversity. To this end, several different sectors of the economy need to be overhauled.  In EU Law, a key policy area is to protect free competition. Article 101 TFEU sets out that agreements between undertakings which have as their object or effect the prevention, restriction or distortion of competition are prohibited. Similarly, Article 102 TFEU prohibits abuse by an undertaking of a dominant position.  This thesis explores what happens when competition law thus intersects with the environmental policy of the Union. The thesis identifies two main situations  of interaction. Undertakings can invoke environmental protection to justify a restriction of competition. The Union may also rely on its antitrust provisions to enforce sustainability by holding unsustainable practices as restrictive agreements or abuses of dominant behaviour, respectively, and thus prohibited by the antitrust provisions.  Generally, the thesis concludes that there is not enough information on how the Commission and the CJEU will approach arguments relating to sustainability in its antitrust assessment. The Commission’s consumer welfare standard appears to limit environmental integration to points where a certain factor results affects the environment or sustainability on the one hand, and consumer welfare on the other. The lack of information, moreover, is in itself an issue as undertakings may abstain from environmental action if they believe they will come under scrutiny due to violations of the antitrust provisions. Therefore, a key conclusion in the thesis is that the Commission and the CJEU should set out clear guidelines for environmental action by undertakings, in relation to the antitrust provisions. Similarly, the Commission appears to be cautious to use antitrust as a tool against unsustainable practices. The Commission has, however, recently decided to open an investigation into agreements which limit sustainability, which shows that the picture may be changing.