Yesterday the European Commission formally requested Italy, Poland and Romania to bring their national legislation on regulated end-user energy prices in line with EU rules.
These three mentioned countries have been accused by the European Commission of not having complied with the EU law. E.g. Poland demands of energy enterprises to specify the end-user prices for gas and then to obtain a prior approval from the national regulatory authority for such prices. If after this formal notification, there will be no adjustment of national regulations, the case will be directed to the ECJ.
Press release - here.
More on internal energy market - here.