Greenethiquette - Un engagement pour des usages des NTIC éco-responsables

Optimise Energy Efficiency

Efficiency: Relationship between the final result and the resources used. (According to ISO 9000)



What this means: Support for the installation of adequate processes for optimising Data Centres’ energy efficiency.

Issues : Currently, for each watt used by a server, 1 or 2 other watts are consumed by the infrastructure (through electrical power, cooling etc). This figure can be reduced to 0.5, or even 0.3, if appropriate measures are taken.





Energy efficiencyThe provider of hosted services must share PUE (Power Usage Effectiveness) information with its customers and undertake « official » eco-efficiency improvement measures (such as following the Code of Conduct for data centres in Europe, or EnergyStar rating for data centre infrastructure)


PUE (Power Usage Effectiveness) is the benchmark indicator for reporting on energy efficiency within data centres. To calculate PUE, total power used by the data centre is divided by total IT equipment (servers, storage, networks etc.) Some higher performers have achieved PUE figures of 1.6 in 2009 (source Green IT newsletter)


The European Code of Conduct serves as a guide for measuring data centre energy efficiency and in implementing a plan for continuous improvements. Anyone can contribute to this Code of Conduct and data centre managers do so of their own free will.

In addition to requiring the participant to adhere to the EEC Code of conduct (or equivalent in others continents),  Greenethiquette  also requests of its participants a policy of transparency, requiring the host to share PUE details from its data centres with consumers, and not only to independant third parties .



Through these mandates, Greenethiquette assures consumers of hosted services that necessary measures are in place for energy efficiency .


In the future, Greenthiquette will incorporate new standards that will further complement  the European Commission Code of Conduct for Data Centres ; an example is  the Energy Star rating for Data Centre infrastructure, currently still in planning stages. Other indicators of energy efficiency that could improve the PUE will also be considered, such as the "fi cosine", the percentage of renewable energies used, or energy efficiency from the source.



Power Usage Effectiveness

PUE (Power Usage Effectiveness) is the measure of energy efficiency of a data centre. This is calculated by dividing total energy consumption by the total energy used by the IT equipment at a Data Centre (servers, storage, networks.) Members of Greengrid, the organisation responsible for these estimations, currently consider a PUE of 1.6 as an attainable target for most data centres (Source: Green IT). This figure may seem somewhat optimistic but is a reasonable target for a data centre motivated to achieve it. However, many data centres are still not involved in the operation. Experts are currently reporting PUE averages of between 2 and 3. This means that by enforcing continuous PUE improvement within the hosted service, companies can trigger energy reduction by as much as 20% to 50% !

The European Code of Conduct for Data Efficiency is a set of guidelines for measuring energy efficiency of a data centre. The Code of Conduct aims to implement a plan of action in order to carry out significant improvements. The guidelines are available to all and simply require data centre managers to make a conscious decision to opt for eco-friendly improvements.