Download: Lighting and IT: reducing energy consumption in the office

Information technologies and lighting: energy consumption reduction measures as part of the Eco-Energy Plan by Enertech for ADEME.

Keywords: office, computer, lighting, energy, consumption, audit, reduction, measurement, etc.

Measures and decisions to reduce energy consumption in offices. This is a very good report on consumption related to IT (peripherals, pc, screens, etc.) and lighting.


Launched almost 2 years ago, the Eco-Energy Plan aims to guarantee the power supply of the Provence Alpes Côte d'Azur Region without resorting to the construction of a new high-voltage line. The actions carried out so far have affected individuals, communities (territorial and local) and the hotel industry. The tertiary sector, which accounts for 16% of regional energy consumption1, and more particularly the offices that cover 25% of the tertiary area, have not yet been the subject of specific actions.

However, offices should be considered a priority target because they have a responsibility in the peak of summer consumption. In fact, air conditioning then calls 40% of the regional power at the most critical moments. But the offices are, so
logical because of important internal inputs, the sector where air conditioning is the most established. Acting on electrical loads, mainly lighting and information technology equipment, has the dual advantage of reducing the own consumption of these uses but also that of air conditioning. When we know that the coefficient of performance of air conditioning facilities rarely exceeds two, we understand the challenge of action oriented towards these uses. For example, if we manage to halve the summer consumption of a use, we achieve, in summer, a total saving of 75% taking into account the impact on air conditioning.

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This sector, whose deposit of energy savings seems important, is very poorly known. There are few studies on this subject. Most are essentially based on estimates, not on measured values, and were made several years ago. Equipment is evolving rapidly, especially hardware related to information technology. It therefore seemed essential to conduct an in-depth measurement campaign to better understand this sector. A preliminary survey for this measurement campaign was conducted during the summer 2003. It has made it possible to precisely define the equipment parks present in the offices and to better understand the level of information and the expectations of the players in this sector.

This study, based on a major measurement campaign, aims to clarify the use of equipment identified in the first phase of this work. Knowing the precise operation of the devices is essential to imagine the solutions to implement in order to reduce electricity consumption and to judge their interest.

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This makes it possible to reveal the most profitable measures for the community and thus to guide its choices regarding the actions to be taken. A measurement campaign can also reveal deposits of free savings, fruits of malfunctions that can not be detected by any other means.

At a time when IT equipment is constantly increasing and where new equipment is constantly appearing in offices, it seems essential to master this development and to use, or even create, features that limit consumption. of each equipment. It's the same for lighting. While the trend is to increase the level of lighting imposed by standards, it is time to take into account the changes imposed by the use of computers in offices, namely that a low level of illumination is more comfortable and even recommended by Occupational Medicine.

Moreover, the employees complain about this over-lighting that tires them. The proper sizing of the installations as well as the use of efficient equipment should become the norm in new constructions.

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