By continuing browsing website, you accept the use of cookies Find out more ok

Energy efficiency of buildings

In the context of a willingness on the part of businesses and individuals to reduce energy consumption and costs, while maintaining the efficiency of their facilities, energy efficiency consists of the creation of more efficient solutions (tools, processes) to optimise consumption, i.e. to improve performance with the same consumption, or to save energy for the same level of service.

This quest for efficiency occurs throughout the whole value chain of the energy sector, and in all activities, products or energy-consuming facilities, as well as the buildings themselves. Building alone counts for almost 40% of final energy consumption in France and nearly 25% of CO2 emissions.

It is therefore indispensable that action be taken both with respect to existing buildings and those under construction.


As a result, this issue forms the basis of a section in the French government’s Grenelle II Act, which requires an energy feasibility study for any construction permit application for a building with a net working area of over 1,000 m2, and imposes a variety of thermal and energy performance standards on manufacturers (from RT 2005 to RT 2012 standards). But beyond that, it is also accompanied by a more comprehensive energy transition of property in its implementation of innovative energy efficiency solutions for all types of buildings.


Hypervision project: from energy measurement to the overall performance of buildings

It is in this context and in line with a broader approach related to Sustainable Development that ALTEN has, for example, worked alongside Bouygues Energy & Services (formerly “Exprimm”) on the Hypervision project, dedicated to the development of a system for consolidating real-time data from a building or even a group of buildings.

The project’s main aim is to centralise detailed data on the energy consumption of a building already in operation in order to statistically model the consumption of buildings. The resulting collaborative system details a building’s energy performance and the various areas of consumption, provides for the monitoring of consumption and changes thereto, and also gives data for a forecast of future energy consumption and recommendations to reduce energy consumption – for example by identifying potential energy savings or highlighting losses. Finally, it affords the implementation of technical improvements and the tracking of results in a process of continual improvement to the energy efficiency of buildings.


consumption, energy saving, facture énergétique, Grenelle II