By sending a reasoned opinion, the European Commission has requested Portugal to correctly transpose all the requirements of the Energy Performance of Buildings Directive (Directive 2010/31/EU) into national law. Under this Directive, Member States must establish and apply minimum energy performance requirements for new and existing buildings, ensure the certification of buildings' energy performance, and require the regular inspection of heating and air conditioning systems. In addition, the Directive requires Member States to ensure that all new buildings are ‘nearly-zero energy’ from 2021 onwards (2019 - for public buildings). A detailed examination of the national legislation transposing the Directive revealed that firstly, some of its requirements did not apply in the Azores region, Portugal. Secondly, the national legislation itself contained exemptions from the energy performance requirements, which are not foreseen in this Directive. Thirdly, Portugal has decided to adopt alternative measures to regular inspection of heating and air conditioning systems, but has not provided the necessary evidence that the same amount of energy savings can be achieved with the alternative measures, as required by the Directive. Therefore, today, the Commission sent a reasoned opinion to Portugal asking to fully ensure that all the requirements of the Buildings Directive are correctly transposed. Portugal has two months now to notify the European Commission of measures taken to remedy this situation, following that the Commission may decide to refer it to the Court of Justice of the EU.More information about the Energy Performance of Buildings Directive is available on the website of DG Energy.