The DEET aims to reduce energy consumption by 40% by 2030, 50% by 2040 and 60% by 2050. The timetable is therefore progressive, which is a guarantee that it will be properly implemented on the ground. But this objective must be based on a starting point. The first declaration of consumption will have to be registered by September 30, 2022 at the latest.
The tertiary eco-energy device leaves the owner free to opt for a target in absolute or relative value. In the first case, it is determined according to the type of building. In the second case, the energy reduction target is based on the actual consumption observed over a defined period. Adapted to old buildings, this method offers the advantage of setting the reference point to take into account, as of today, the investments made in recent years in energy efficiency. The objective is not to penalize actors already engaged in a virtuous approach. They will thus be able to take a reference year prior to major work carried out in recent years, such as the revision of insulation or the installation of a heating system. Thus, it will be possible to avoid that the effort required does not take them into account to achieve the objective of reducing consumption in 2030, 2040 and 2050;