Judgment of the Court (Fifth Chamber) of 28 October 2021.#Eco Fox Srl and Others v Fallimento Mythen Spa and Others.#Requests for a preliminary ruling from the Consiglio di Stato.#Reference for a preliminary ruling – State aid – Biodiesel market – Aid scheme establishing biodiesel quotas exempt from excise duty – Alteration of the authorised aid scheme – Amendment of the criteria for allocating quotas – Obligation of prior notification to the European Commission – Regulation (EC) No 659/1999 – Article 1(c) – Concept of ‘new aid’ – Regulation (EC) No 794/2004 – Article 4(1) – Concept of ‘alteration to existing aid’.#Joined Cases C-915/19 to C-917/19.