On 22 July 2021, the EU Agency for the Cooperation of Energy Regulators (ACER) published the sixth edition of its guidance on the Regulation on wholesale energy market integrity and transparency (REMIT). The guidance is intended to help EU national regulatory authorities on the application of the definitions set out in Article 2 of REMIT and on other issues related to the application of REMIT. In this latest edition of the guidance ACER has made significant changes to the structure in order to make it more intuitive, and inserted additional content on the scope of REMIT and on the core prohibitions of insider trading and market manipulation.