Article 15 1.

ACER, in close cooperation with the Commission, the Member States and the relevant national authorities, including the regulatory authorities, and without prejudice to the competences of competition authorities, shall monitor the wholesale and retail markets in electricity and natural gas, in particular the levels and the formation of retail and wholesale prices, in order to facilitate that relevant authorities can identify possible anti-competitive, unfair or untransparent behaviour by market operators, and with regard to compliance with the consumer rights laid down in Directive (EU) 2019/944 and Directive (EU) 2024/1788, the impact of market developments on household customers, access to the networks including access of electricity produced from renewable energy sources, the progress made with regard to interconnectors, potential barriers to cross-border trade, including the impact of blending hydrogen into the natural gas system and barriers to the cross-border flow of biomethane, regulatory barriers for new entrants on the market and smaller market participants, including citizen energy communities and renewable energy communities, State interventions preventing prices from reflecting actual scarcity, such as those set out in Article 10(4) of Regulation (EU) 2019/943, the performance of the Member States in the area of security of supply of electricity on the basis of the results of the European resource adequacy assessment as referred to in Article 23 of that Regulation, taking into account, in particular, the ex post evaluation referred to in Article 17 of Regulation (EU) 2019/941.