The European Commission has sent a reasoned opinion – the last step before referral to the European Court of Justice – to France and Latvia for failing to notify whether they have implemented the measures required by the Directive on Energy Performance of Buildings. France and Latvia were issued letters of formal notice in 2006, urging them to notify the appropriate legislative measures. To date the Commission has not received all the necessary evidence to conclude that the two countries have implemented the required measures, which should have been transposed by 4 January 2006. The aim of the Directive is to significantly reduce energy consumption in buildings, one of the cornerstones in mitigating climate change. The Directive requires Member States to establish minimum energy performance standards and energy performance certification schemes for buildings, as well as to ensure that heating and air conditioning installations are regularly inspected to enable performance improvements.