Opinion of Advocate General Rantos delivered on 2 March 2023.#Autoridade da Concorrência and Others v Ministério Público.#Request for a preliminary ruling from the Tribunal da Relação de Lisboa.#Reference for a preliminary ruling – Article 101 TFEU – Agreements, decisions and concerted practices – Prohibition of agreements, decisions and concerted practices – Agreements between undertakings – Distinction between a vertical and a horizontal agreement – Potential competition – Restriction of competition by object or by effect – Agreement between a supplier of electricity and a retailer of consumer products operating hypermarkets and supermarkets – Non-compete clause – Regulation (EU) No 330/2010 – Agency contract – Liberalisation of the market for the supply of electricity.#Case C-331/21.